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1.
Summary The effectiveness of wax-coated calcium carbide (as a slow-release source of acetylene) and nitrapyrin in inhibiting nitrification and emission of the greenhouse gases N2O and CH4 was evaluated in a microplot study with dry-seeded flooded rice grown on a grey clay near Griffith, NSW, Australia. The treatments consisted of factorial combinations of N levels with nitrification inhibitors (control, wax-coated calcium carbide, and nitrapyrin). The rate of nitrification was slowed considerably by the addition of wax-coated calcium carbide, but it was inhibited only slightly by the addition of nitrapyrin. As a result, the emission of N2O was markedly reduced by the application of wax-coated calcium carbide, whereas there was no significant difference in rates of N2O emission between the control and nitrapyrin treatments. Both nitrification inhibitors significantly reduced CH4 emission, but the lowest emission rates were observed in the wax-coated calcium carbide treatment. At the end of the experiment 84% of the applied N was recovered from the wax-coated calcium carbide treatment compared with 43% for the nitrapyrin and control treatments.  相似文献   

2.
Summary Started from the basic principles of IBP and MAB programmes, genetic resources of agricultural plant species cultivated traditionally in Transylvania have been studied. Land-races from this territory deserve special attention, as Transylvania is situated on the north-eastern border of the Mediterranian centre of diversity, between Near-East and Western Europe, has a relatively isolated position surrounded by the eastern range of the Carpathian Mountains. Traditional agriculture practiced in many of the intramountain hollows is favourable for the preservation of ancient land races and the territory is also promising in respect of spontaneous germplasm resources. In the Agrobotanical Garden of the Institute of Agronomy at Cluj-Napoca seed samples of economically important plant species — cultivated land-races and wild relatives — have been collected with the beginning of 1970. Based on this collection the threatened variability of agricultural plant species have been grouped in four major categories. Trends and peculiarities of genetic erosion acting in these groups have been exemplified with the cases ofTrifolium pratense L.,Phaseolus vulgaris L. andTriticum monococcum L.
Probleme der Generosion in Transylvanien, Rumänien
Zusammenfassung Ausgehend von den Grundprinzipien des IBP und MAB-Programms wurden die genetischen Ressourcen landwirtschaftlicher Pflanzenarten, die traditionell in Transylvanien angebaut werden untersucht. Landsorten aus dieser Gegend verdienen besondere Beachtung, da Transylvanien an der nordöstlichen Grenze des mediterranen Genzentrums zwischen nahem Osten und Westeuropa liegt und eine relativ isolierte Lage, umgeben von der Ostkette der Karpaten besitzt. Traditioneller Ackerbau, in vielen Gebirgsgegenden noch praktiziert, begünstigt die Erhaltung einstiger Landsorten und das Gebiet ist vielversprechend in Bezug auf das Vorkommen genetischer Ressourcen. Im Agrobotanischen Garten des Instituts für Ackerbau in Cluj-Napoca werden Samenproben von ökonomisch bedeutenden Pflanzenarten, Landsorten und verwandte Wildarten, beginnend seit 1970 gesammelt. Auf dieser Sammlung aufbauend wurden die in Bezug auf ihre Variabilität gefährdeten landwirtschaftlichen Pflanzenarten in Vier Hauptgruppen eingeteilt. Entwicklung und Besonderheiten der Generosion, die sich in diesen Gruppen vollzieht, werden am Beispiel vonTrifolium pratense L.,Phaseolus vulgaris L. undTriticum monococcum L. dargestellt.
(. . )
« », , . , o , , . , , ë , . () 1970 . , , . , , , . , , Trifolium pratense L.,Phaseolus vulgaris L. Triticum monococcum L.
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3.
Summary The effect of increasing oxygen concentrations (0, 5, 10 and 20 Vol% O2) on total denitrification and N20 release was studied in model experiments using a neutral pH loamy soil relatively rich in easily decomposable organic matter and supplied with nitrate (300 g nitrate N/g dry soil). The sterilized soil was inoculated with three different denitrifying bacteria (Bacillus licheniformis,Aeromonas denitrificans andAzospirillum lipoferum) and incubated (80% WHC, 30°C). The gas volume was analysed for O2, CO2, N2O, NO and N2 by gas chromatography and the soil investigated for changes in ammonium, nitrite, nitrate, pH, total N and C as well as water-extractable C. WithB. licheniformis andAeromonas denitrificans total denitrification increased remarkably with increasing pO2 as the result of intensified mineralization.Azospirillum lipoferum, however, showed the highest activity at 5 vol% O2. WithB. licheniformis N2O was released only in anaerobic conditions and at 5 Vol% O2 (maximum) or 10 Vol% 02, but not at 20 Vol%, whereasAeromonas denitrificans produced N2O only in the presence of He gas (maximum) or at 5 Vol% O2. In contrast to these bacteria, N2O production withAzospirillum lipoferum was restricted to 10 Vol% O2 (maximum) and to 20 Vol% 02, with some traces at 5 vol% O2. With a certain set of conditions, total denitrification and N2O formation seem to be governed by the mineralization rate of the organisms in question. The increased demand for electron acceptors by a high turnover rate rather than the presence of anaerobic conditions seems to have determined the rate of denitrification.  相似文献   

4.
Zusammenfassung Mit Hilfe des Ultrarotabsorptionsschreibers (URAS) wurde die CO2-Konzentration in der bodennahen Luftschicht unter dem Einfluß von Wind und Windschutz gemessen. In der Nacht ist die CO2-Konzentration im Windschutz gegenüber dem Freiland erhöht, da dort die Atmungskohlensäure vor Verwehung geschützt ist. Bei unbewachsenem Boden bleibt jedoch in Lee die CO2-Konzentration durch Behinderung der Zufuhr aus der Umgebung geringer als in Luv. Für den Verlauf des Aufbaues eines CO2-Gefälles vom Boden her ist die Höhe der Windgeschwindigkeit bestimmend. Das rasche Absinken der CO2-Konzentration in den Morgenstunden muß zuerst durch die Photosynthese, die schon kurz nach Sonnenaufgang einsetzt, verursacht werden. Nach Erwärmung der untersten Luftschichten geht dann durch den Vertikalaustausch der größte Teil des während der Nacht angesammelten Kohlendioxyds den Pflanzen für die Photosynthese verloren. Am Tage besteht im Windschutz gegenüber dem Freiland meist ein CO2-Defizit, das zeitweise durch die erschwerte Erneuerung der Bestandesluft durch Advektion, in erster Linie jedoch durch die stärkere Assimilation der Pflanzen in Lee zustande kommt. Diese Mitteilung wird durch eine weitere ergänzt werden, welche das photosynthetische Verhalten von Pflanzen mit und ohne Windschutz behandelt.
CO2-content in the air layer above the ground with crop cultures in open field and under the lee
Summary By means of ultra-red absorption recorder (URAS) the CO2-concentration of the air near the ground under the influence of wind and wind shelter was investigated. During the night the CO2-concentration under the lee has been found increased in comparison with open field. Behind a shelter the CO2 is not so much blown away as outside. Indeed, above soil without any plant growth the CO2-concentration inside the sheltered area remains lower in consequence of the hindrance of horizontal transport of air. The wind speed is important to the formation of a CO2-gradient above the ground. The rapid decrease of CO2-concentration in the early morning must be caused primarily by photosynthesis of plants beginning almost immediately after sunrise. Later on by vertical air movement the greatest part of CO2, accumulated during the night, is lost for photosynthesis by warming the air near the ground. During the day under the lee there exist mostly a CO2-deficite in comparison with the open field. This is partly rendered by difficulty of air transport by advection, at first, indeed, by an increased rate of photosynthesis under the lee. The present communication will be continued by a second one concerning the photosynthetic behaviour of plants inside and outside of wind shelter.
CO2
, (URAS), CO2 . CO2 , , , , , . , , CO2 , . CO2 . CO2 , . , , , , . , , CO2, , . — .
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5.
Summary Dissimilarities in soil N uptake between N2-fixing and reference non-N2-fixing plants can lead to inaccurate N2 fixation estimates by N difference and 15N enrichment methods. The natural 15N abundance ( 15N) method relies on a stabilized soil 15N pool and may provide reliable estimates of N2 fixation. Estimates based on the 15N and differences in N yield of nodulating and non-nodulating isolines of soybean were compared in this study. Five soybeans from maturity groups 00, IV, VI, and VIII and their respective non-nodulating isolines were grown at three elevations differing in ambient temperature and soil N availability. Despite large differences in phenological development and N yield between the non-nodulating isolines, the 15N values measured on seeds were relatively constant within a site. The 15N method consistently produced lower N2 fixation estimates than the N difference method, but only in three of the 15 observations did they differ significantly. The average crop N derived from N2 fixation across sites and maturity groups was 81% by N difference compared to 71% by 15N. The magnitude of difference between the two methods increased with increasing proportions of N derived from N2 fixation. These differences between the two methods were not related to differences in total N across sites or genotypes. The low N2 fixation estimates based on 15N might indicate that the nodulating isolines had assimilated more soil N than the non-nodulating ones. A lower variance indicated that the estimates by N difference using non-nodulating isolines were more precise than those by 15N. Since the differences between the estimates were large only at high N2 fixation levels (low soil N availability), either method may be used in most situations when a non-nodulating isoline is used as the reference plant. The 15N method may have a comparative advantage over N difference and 15N enrichment methods in the absence of a suitable non-N2-fixing reference plant such as a non-nodulating isoline.  相似文献   

6.
Zusammenfassung Es wird eine Methode beschrieben, die es erlaubt, Chromosomen-Quetschpräparate ohne Ablösen des Deckglases haltbar zu machen. Diese Methode arbeitet materialschonend und ist deshalb für besonders empfindliche Objekte geeignet.
Summary It is described a new method for making smear slides of chromosomes permanent without removing the cover slip from the slide. This method is working without any damage or loss of material and therefore suitable for sensible objects.
am ¶rt;au , «» . , , .
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7.
Zusammenfassung Für die kolorimetrische Bestimmung von Khellin und Visnagin ausAmmi visnaga L. wird eine empfindliche Farbreaktion beschrieben, die auf der Bildung eines blauvioletten Farbstoffs aus den Furanochromonen undm-Dinitrobenzol in stark alkalischer Lösung beruht. Die Empfindlichkeit der Methode reicht aus, um beide Verbindungen nach papierchromatographischer Trennung quantitativ zu bestimmen. Die gleiche Reaktion eignet sich für die Sichtbarmachung von Khellin und Visnagin auf dem Papierchromatogramm.
Summary A sensitive colour reaction is described for the colorimetrio estimation of khellin and visnagin fromAmmi visnaga Linn., depending on the formation of a blue-violet dye from the furochromones andm-dinitrobenzene in a strongly alkaline solution. The sensitivity of this method is sufficient to estimate both the compounds after paperchromatographic separation. The same reaction is suitable for the detection of khellin and visnagin on paperchromatograms.
Ammi visnaga L. - m- . . , .
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8.
A comparative characterization of 10 field populations of the maize (Zea mays var. indurata) landrace Nostrano di Storo was carried out using different types of PCR-based markers. The inbred line B73 and three synthetics (VA143, VA154 and VA157) selected from as many landraces were also used. Genetic diversity and relatedness were evaluated over 84 SSR and 53 I-SSR marker alleles using a total of 253 individual DNAs. Up to 23 alleles per SSR locus were scored while the average effective number of alleles per population was 6.99. Nei's total genetic diversity as assessed with SSR markers was HT = 0.851 while the average diversity within populations was HS = 0.795. The overall Wright's fixation index FST was as low as 0.066. Thus, more than 93% of the total variation was within population. Unique alleles over all SSR loci were found for six populations. An average of 17.7 marker alleles per I-SSR primer were scored with an effective number of marker alleles per locus of 1.34. The Shannon's diversity information index over all populations and I-SSR loci was 0.332, varying from 0.286 to 0.391. The extent of differentiation between populations was as low as GST = 0.091. Dice's genetic similarity matrices were estimated for both SSR and I-SSR markers. The mean genetic similarity coefficients within and between populations were respectively 0.269 and 0.217, for SSR markers, and 0.591 and 0.564, for I-SSR markers. UPGMA dendrograms displayed all field populations but one clustered into a distinct group, in which the synthetic VA154, selected from the Marano Vicentino landrace, was also included. One field population and the other two synthetics were clustered separately as well B73. The matrix correlation assayed by the Mantel's correspondence test was as high as 0.908. Findings suggest that, although a high variability can be found among plants, most plant genotypes belong to the same landrace called Nostrano di Storo. Although gene flow from commercial hybrids might have occurred, the large number of polymorphisms and the presence of both unique alleles and alleles unshared with B73 and synthetics are the main factors underlying the value of this flint maize landrace as a source of genetic variation and peculiar germplasm traits. Because of its exclusive utilization for human consumption, such a molecular marker characterization will be a key step for obtaining the IGP mark and so promote the in situ conservation and protection of the landrace Nostrano di Storo.  相似文献   

9.
Summary Important papers on taxonomy and evolution of cultivated plants published in 1982 and 1983 were compiled and briefly discussed.
Taxonomie und Evolution der Kulturpflanzen: Literaturübersicht 1982/1983
Zusammenfassung Wichtige Arbeiten über Taxonomie und Evolution der Kulturpflanzen aus den Jahren 1982 und 1983 wurden zusammengestellt und kurz kommentiert.
: 1982–1983
, 1982 1983 . .
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10.
Zusammenfassung Weitere 74 Gersten aus der Gaterslebener Kollektion wurden auf Anfälligkeit bzw. Resistenz gegenüber dem Gerstengelbmosaik-Virus (barley yellow mosaic virus) geprüft. Neun Herkünfte aus Ostasien, 32 besonders frostresistente Land-und Zuchtsorten und weitere 23Hordeum-Sippen waren virusanfällig (Tab. 1). Unter zehn Ragusa Abkömmlingen besaßen drei absolute Resistenz und weitere fünf Teil-Resistenz (Tab. 2).
Resistance in the gatersleben barley and wheat collection. 26. Testing of barley for reaction to barley yellow mosaic virus
Summary Nine barleys from East Asia, 32 varieties with high frost-hardiness and other23 Hordeum taxa (H. agriocrithon, H. spontaneum andH. vulgare) were classified as susceptible to this virus (table 1). Of ten progenies of Ragusa three were found with a high degree of resistance, further five included most resistant as well as some susceptible plants (table 2).
. 26. (barley yellow mosaic virus)
, , (barley yellow mosaic virus). 74 , : 9 — , 32 — — 23 — (. 1). 10 Ragusa — — (. 2).
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11.
Zusammenfassung In den Jahren 1977 und 1978 trat infolge der kühlen und feuchten Witterung ein hoher natürlicher Befall des Weizens mitCercosporella herpotrichoides auf. Es wurde in diesen Jahren an 1736 Weizen der Befall erfaßt (Tab. 1). Künstliche Infektionen mit Hilfe eines Keimrollentestes gaben zusätzliche Informationen hinsichtlich der Anfälligkeit der Jungpflanzen.Unter den geprüften Weizen konnten keine vollständig resistenten gefunden werden. Einen geringen Befall auf dem Feld und an den künstlich infizierten Jungpflanzen wiesen acht Winterweizensorten (Tab. 2) und 19 Sommerweizensorten sowie 24 Auslesen aus alpinen Landsorten auf (Tab. 3). Unter den Eltern der Sorten traten entweder Hâtif Inversable oder Red Fife oder auch beide Sorten gemeinsam auf.
Resistance in the barley and wheat collection Gatersleben. 23. Informative testing of wheat withCercosporella herpotrichoides Fron
Summary Moist and cool weather conditions favoured a strong natural infection byCercosporella herpotrichoides Fron in wheat in 1977 and 1978. The intensity of this infection was examined with a collection of 1736 wheats (table 1). Artificial infections carried out by means of rolled paper-towel test gave further information on the susceptibility of seedlings.Total resistant wheats could not be selected. Slight susceptibility in the field and with the artificially infected seedlings was shown by eight winter wheat cultivars (table 2) and 19 spring wheat cultivars as well as 24 selections of Alpine land-races (table 3). In the pedigrees of some of the cultivars the presence of Hâtif Inversable and/or Red Fife was noticed.
. 23. Cercosporella herpotrichoides Fron
1977 1978 ., , ( ) Cerco-Sporella herpotrichoides. 1736 (. 1). . . , ë , (. 2) 19 — , 24 (. 3). , , .
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12.
Summary In a series of short-term experiments root systems of young sorghum and millet plants inoculated with N2-fixing bacteria were exposed to 15N2-enriched atmospheres for 72 h. The plants were grown in a normal atmosphere for up to 22 days after the end of the exposure to allow them to take up the fixed N2. Environmental conditions and genotypes of sorghum and millet were selected to maximise N2-fixation in the rhizosphere. Detectable amounts of fixed N (> 16 g/plant) were rapidly incorporated into sorghum plants grown in a sand/farmyard manure medium, but measurable fixation was found on only one occasion in plants grown in soil. N2 fixation was detectable in some experiments with soil-grown millet plants but the amounts were small (2–4 g/plant) and represented less than 1 % of plant N accumulated over the same period. In many cases there was no detectable 15N2 incorporation despite measurable increases in ethylene concentration found during an acetylene reduction assay.Published as ICRISAT Journal Article No. JA 740  相似文献   

13.
Zusammenfassung Bei Ackerbohnen (Vicia faba L. var.minor) führen hohe Temperaturen in Verbindung mit Wasserdefizit zu einem Absinken der Netto-CO2-Assimilation. Außerdem sterben mehr Blätter ab. Als Folge sind geringere Trockenmassebildung und weniger Blüten zu beobachten. Defoliationsexperimente zeigen, daß ein reduzierter Blattapparat zu beschleunigter Alterung und verringerter Netto-CO2-Assimilation führt.
The influence of drought stress and leaf removal on the netto CO2-assimilation, selected morphological properties and leaf components of field beans (Vicia faba L. var. minor)
Summary In field beans a high temperature treatment in connection with deficiency of water decreases the netto photosynthesis. Under this conditions most of the leaves die off. As a result there is a decrease in the formation of dry mass and a lower number of flowers are observed. Removal of leaves from the plants leads to a faster senescence and a decreased rate of netto photosynthesis.
- CO2, (Vicia faba L. var.minor)
CO2. , . . , - CO2.
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14.
Zusammenfassung Gewebekulturen verschiedenerDatura-Arten zeigten in ihrem Alkaloid-spektrum erhebliche qualitative und quantitative Abweichungen von dem intakter Pflanzen. Hyoscyamin und Scopolamin konnten nicht nachgewiesen werden. Bei exogener Zufuhr von Hyoscyamin zuDatura-Gewebekulturen wurde während 14-tägiger Versuchsdauer ein erheblicher Schwund des zugesetzten Alkaloids beobachtet; eine Umwandlung von Hyoscyamin in Scopolamin, wie sie aus intakten Pflanzen bekannt ist, war nicht festzustellen.
Tissue cultures of alkaloid-bearing plants
Summary The alkaloid spectrum ofDatura tissue cultures differed considerably from that of intact plants. Neither hyoscyamine nor hyoscine were detected in the tissue cultures. Hyoscyamine administered toDatura tissue cultures diminished in considerable quantity during the experimental period of 14 days but no conversion into hyoscine was detected as it is occuring in intactDatura plants.
. . 14 ; , , .

I. Mitteilung vgl. H. Koblitz, K Grützmann und I. Hagen. — Z. Pflanzenphysiol.56 (1967) 27–32.  相似文献   

15.
Random amplified polymorphic DNA (RAPD) markers were used to evaluatethe levels and patterns of genetic diversity in ten Elymusalaskanus populations, which were collected from Canada, USA,Greenland and Russia. Ten arbitrarily chosen decamer primers were used in thisstudy. The results revealed high levels of variation. The mean number of allelesper locus (Ap) was 1.5, ranging from 1.4 to 1.6, the meanpercent of polymorphic loci (Pp) was 49.5%, ranging from35.1% to 64.9%, and the mean gene diversity (Hep) was0.162, varying from 0.142 to 0.262. The total variation wasH T = 0.403. When partitioned(G ST), 60% of the total variation was foundamong the populations. Although the genetic diversity values obtained with RAPDsare much higher than for allozymes, they are similar regarding how the geneticvariation is distributed among populations. In addition, a similar geneticpattern of population differentiation, where populations from Greenland andthe USA (violaceus and latiglumis)were clearly separated from the others (hyperarcticus,komarovii and sajanensis), wasrevealed by both the cluster and principal coordinates analyses.  相似文献   

16.
Summary The influence of the partial pressure of oxygen on denitrification and aerobic respiration was investigated at defined P02 values in a mull rendzina soil. The highest denitrification and respiration rates obtained in remoistened, glucose- and nitrate-amended soil were 43 1 N20 h–1g–1 soil and 130 1 O2 h–1g–1 soil, respectively. At -55 kPa matric water potential, corresponding to 40% water saturation, N20 was produced only below P02 40 hPa. The K m, for O2 was 3.0 x 10–6 M. Formation of N2O and consumption of O2 occurred simultaneously with half maximum rates at P02 6.7–13.3 hPa. Nitrite accumulated in soil below 40 hPa and increased with decreasing pO2. The upper threshold for N20 formation in amended soil was P02 33–40 hPa (39-47 M O2).  相似文献   

17.
Summary Spirogyra gaterslebensis nov. spec.Vegetative cells 18–21 × (88,5-) 109–182 (–223,5) µm, with replicate end walls. 1 Chromatophore, making (4-) 5–6 (–8) turns, rarely 2 Chromatophores with (1,5-) 2 (–3) turns. Conjugation lateral and scalariform; tubes formed ± by both gametangia; fertile cells abruptly inflated to 41,5–52,0 (–70,0) µm in diameter. Zygospores ellipsoid 26,0–34,0–45,0 (–52,0) × 41,5–47,0–78,0 (–96,0) µm; median spore wall yellow, finely punctate, on the poles sometimes with a few wrinkles.In the GDR in a road ditch between Gatersleben and Quedlinburg with shallow, slowly running water, together withVaucheria woroniniana Heering V. debaryana Woronin andV. sessilis (Vauch.) D.C. April–Mai 1967.
. VI.Spirogyra gaterslebensis, Salamacis
Spirogyra gaterslebensis nov. spec. : , Vaucheria woroniniana Heering,V. debaryana Woronin V. sessilis (Vauch.) D. C. 25. IV — 16. V. 1967. . .
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18.
Zusammenfassung In dieser zweiten Übersicht sind weitere Literaturergänzungen zum Problem der Struktur und Funktion des genetischen Materials zusammengestellt. Neben gesicherten Fakten wurden auch Hypothesen und unterschiedliche Interpretationen von Untersuchungsergebnissen diskutiert. Die Literatur ist bis November 1964 berücksichtigt.
Summary In this second review further literature on the problem of structure and function of genetic material are summarized. Beside certain experimental results also hypotheses and different interpretations of results are discussed. The survey of the literature for this review was completed in November 1964.
am ¶rt;au , , . . 1964 .
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19.
Summary Cellulase activity in a silt loam soil was assayed and characterised using a microcrystalline cellulose substrate (Avicel). Activity was maximal between pH 5.3 and pH 6.0. A 64% loss in activity was observed on air-drying the soil. However, the residual activity was stable to storage at 40°C for 7 days and was resistant to the action of added protease. The component endoglucanase and -D-glucosidase activities in field-moist and air-dried soil were also assayed. The proportion of the soil microbial population able to utilise cellulose was investigated and the persistence of two free (soluble) cellulase preparations of microbial origin was determined following their addition to soil. A rapid decline in the endoglucanase activity of a Streptomyces sp. cellulase preparation was observed while 30% of the original activity of a Trichoderma viride cellulase preparation could still be detected after 20 days. From the data obtained in this study it appears that the major portion of the -D-glucosidase activity is bound to and protected by the soil colloids. By contrast, the major portion of the exo- and endoglucanase activity appears to be free in the soil solution, attached to the outer surfaces of cellulolytic microorganisms or associated in enzyme substrate complexes. The low residual activity measured in air-dried soil may owe its stability to an association with soil colloids or with recalcitrant cellulosic material present in soil.  相似文献   

20.
Zusammenfassung Es wird ein Fall von Hybrideffekt beim Mais beschrieben, in dem eine negative, züchterisch unerwünschte Korrelation bei den Elternformen — zwischen Rohproteingehalt und Kornertrag je Pflanze — sich in der F1 in positive Richtung verschiebt und in dieser Generation sowie in der F2 nicht signifikant von Null verschieden wird oder sogar eine positive Tendenz zeigt. Dasselbe gilt für die negative Korrelation zwischen Rohproteingehalt und Korngröße. Diese heterotische Verbesserung der Korrelation wurde in zweijährigen Versuchen sowohl bei Kreuzungen zwischen schwach ingezüchteten Sortimentsherkünften wie auch bei selektierten Inzuchtlinien beobachtet.
A positive effect in hybrids as to the correlation between crude protein content and grain yield per plant in maize
Summary A case of heterosis in maize is described, which indicates that a negative, undesirable correlation in the parent forms — between crude protein content and grain yield per plant — is shifted in positive direction in hybrids. In F1 generation as well as in F2 this correlation becomes not significantly different from zero or even shows a tendency to the positive. The same is true of the negative correlation between crude protein content and grain size. This heterotic improvement of the correlations was observed in experiments of two years, with maize collections of low inbreeding degree as well as with selected inbred lines.
( )
, — ( ) — , , . oe , .

Herrn Prof. Dr. Drs. h. c.Hans Stubbe zum 75. Geburtstag gewidmet.

Für die Rohproteinanalysen sei dem Eiweißlabor von Dr. F.Scholz, für die Verrechnung der Korrelationen der Forschungsgruppe von Dr. A.Meister gedankt. Für die Betreuung der Feldversuche ist der Verf., wie immer, Frl. B.Kohl zu Dank verpflichtet.  相似文献   

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