共查询到20条相似文献，搜索用时 62 毫秒
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为给锥栗杂交育种和遗传作图的亲本选配提供参考,应用SSR分子标记技术,分析了福建省建瓯市17个锥栗主栽农家品种的遗传多样性。结果表明:不同农家品种遗传多样性丰富,利用筛选出的12对引物组合扩增的片段大小主要在50~2 000 bp之间,共扩增出180个位点,多态位点163个,占90.56%;17个锥栗主栽农家品种的遗传相似性系数在0.509 2~0822 1之间,乌壳长芒和牛角仔(晚熟)的相似性系数最大,中尖嘴与白露仔的相似性系数最小,且在相似性系数为0.60处,大尖嘴和中尖嘴单独聚为I类,在相似性系数为0.77处,第II类又被分为A~H共8个组;SSR引物组合Cs CAT33和Cm TCR4共同构建了17个锥栗主栽农家品种的DNA指纹图谱。 相似文献
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ABT绿色植物生长调节剂对荔枝保花保果的研究 总被引：2，自引：0，他引：2
荔枝落花果严重、座果率一般在３％－８％。在花期喷施ＡＢＴ绿色植物生长调节剂,对减轻落花落果,提高座果率和产量有明显作用。本试验对该药物的两种剂量,两种浓度进行了对比,结果表明,以８＾＃１０ｍｇ／ｋｇ,９＾１０ｍｇ／ｋｇ效果最好,其座果率比ＣＫ提高了２．５－４．８个百分点,株产量增加了３３．６％－４１．７％,单果重增加了１１．５％－２１．７％,投入产出比为１：（１６．８－２０．９）,效益显著。 相似文献
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对12个锥栗品种(八月香、白露仔、薄壳仔、黄榛、嫁接毛榛、建瓯47号、麦色仔、歪嘴榛、乌壳长芒、油榛、圆蒂仔、政和晚熟),采用紫外-可见分光光度法分别测定锥栗中总黄酮和总酚的含量,同时测定锥栗种子的横纵径比、种皮厚度和鲜出仁率等性状,探讨锥栗活性成分与性状的相关关系。结果表明,锥栗的纵横径比与总黄酮含量呈显著负相关(r=-0.576);种皮厚度与鲜出仁率存在显著的负相关(r=-0.595);总黄酮含量与总酚含量呈显著的正相关关系(r=0.693)。根据锥栗中活性成分与性状存在相关关系,可通过外观性状挑选出活性成分高的品种。经聚类分析,可将12个品种分为4种类型,其中包括S6、S8、S9、S10、S12等5个品种的总黄酮、总酚含量均高,平均值分别为2026.70μg·g~(-1)、727.95μg·g~(-1),可作为育种材料,进入锥栗的育种群体,结合其他性状开展锥栗优良品种选育。 相似文献
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全天然果蔬保鲜涂料在锥栗保鲜上的应用研究 总被引：1，自引：0，他引：1
采用不同浓度的全天然果蔬保鲜涂料在常温和低温条件下进行锥栗果的保鲜试验研究,结果表明,在低温条件下,采用２０％的全天然果蔬保鲜涂料保鲜锥栗的效果最好,１００ｄ的保存率达９１．９７％,失水率为４．２０％。而且保鲜后锥栗果的可溶性糖、淀粉、粗脂肪及多种氨基酸含量基本不变,且经济效益显著,值得在闽北林区大力推广。 相似文献
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对龙泉市林科所杉木等１代种子园盛果前期资料的统计分析表明，嫁接后第３－４年开始投产，第８－９年开始进入盛果期，产量一般稳定在７５～１２０ｋｇ／ｈｍ＾２各无性系间平均单株产量差异极显著，而重重复率达到５７．９６％－７０．６１％，同一无性系直冠形接株平均单株产量极显著高于盘冠形接株，差距达到３．５倍左右，并有随着树龄增加而扩大，而种子发芽率前者极显著高于后者，涩粒率前者低于后者，因此，选择遗传性优良的 相似文献
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苏力精防治马尾松毛虫试验 总被引：1，自引：0，他引：1
使用毒力效价为３２０００ＤＰＩＵ／ｍｇ含菌数为２０００－３０００亿／ｇ的苏力精原粉、微胶囊的粉，以１：４０－８０（轻质碳酸钙）：０．１６－０．３２（苯甲酸钠）的配方防治马尾松毛虫，每公顷施药量为２．２５ｋｇ防治后第１０天虫口 率为７０．９－９１．１％，防治后第２５天虫口减退率为８３．６－９８．３％；平均达９４．０％，校正防治效果为６８．９－９６．８％，平均达８８．６％。苏力精防治以毛虫个有用量少， 相似文献
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沙棘籽油,果汁对急性放射病小鼠防护作用的初步研究 总被引：1，自引：0，他引：1
本文用＾６０Ｃｏγ－射线使小鼠产生急性放射病。小鼠灌胃沙棘籽油和果汁，观察其防护作用。结果表明，沙棘油和果汁大剂量（４．７５和１４．４ｇ／ｋｇ）可使小鼠３０ｄ存活率分别提高３０％和３５％。籽油（５．９和２．９８ｇ／ｋｇ） 和果汁（１８和９ｇ／ｋｇ）还能降低受照小鼠ＰＣＥ微核率，此外籽油１１．９、５．９５和２．９８ｇ／ｋｇ与果汁１４．４和７．２ｇ／ｋｇ还能提高小鼠脾ＣＦＵ－Ｓ数，籽油５．９５ｇ／ｋｇ 相似文献
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Our study focuses on predicting the ultimate short-term load carrying capacity of timber-to-timber connections with dowel-type fasteners. The wide range of possible configurations in practice makes the resolution of these values by tests unrealistic. Moreover, different current regulations do not consider some specific failure mechanisms. In many countries, the reduction of resistance involved by this phenomenon is taken into account by considering an effective number of dowels (nef) smaller than the actual number of dowels (n) in the connection. However, these different regulations disagree on the values of nef and on other points (spacing, partial coefficient of security, formulas). These discrepancies in design rules invite the fundamental research on this topic and, therefore, new methods are sought in order to estimate the load carrying capacities of the connections. In the light of these, our approach consists of predicting the load carrying capacity with the neural network numerical tool. The results obtained by this analysis tool are satisfactory, although the model remains complex. Subsequently, we focus on the simplification of this numerical model with classical regression techniques in order to implement it in a design code. 相似文献
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Ophiostoma species were isolated from bark beetles and Abies mariesii, A. veitchii and A. homolepis attacked by the beetles in Nikko, Tochigi, central Honshu, Japan. One to two Ophiostoma species were frequently isolated from each species of bark beetle. Ophiostoma subalpinum was the most common associate of Cryphalus montanus. Ophiostoma sp. B as well as O. subalpinum was a common fungus associated with Polygraphus proximus. Ophiostoma europhioides was isolated from Dryocoetes hectographus and D. autographus as one of the common associates. Ophiostoma sp. J and Ophiostoma sp. S were frequently isolated from D. autographus and D. striatus, respectively. These fungi seem to have specific relationships with particular bark beetles. Ophiostoma sp. B, Ophiostoma sp. J and Ophiostoma sp. S have unique morphological characteristics and appear to be new species. Five trees of A. veitchii, approximately 43 years old, were inoculated with five Ophiostoma species to assess the relative virulence of the fungi. Ophiostoma subalpinum, Ophiostoma sp. B, and O. europhioides had relatively higher virulence than the other species studied. 相似文献
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Parasitic Hymenoptera from the suprafamily Ichneumonoidea attacking the horse chestnut leafminer Cameraria ohridella Deschka & Dimic (Lepidoptera: Gracillariidae) were studied in southwest Slovakia during 2000 and 2001. The search for such species resulted in the determination of eight ichneumonid species, Gelis agilis (Fabricius), Itoplectis alternans (Gravenhorst), I. clavicornis (Thompson), I. maculator (Fabricius), Scambus annulatus (Kiss), S. brevicornis (Gravenhorst), Zatypota percontatoria (Müller), Adelognathus sp. and a braconid Colastes braconius Haliday. The most abundant species was S. annulatus. All these species recorded are polyphagous and often facultative hyperparasitoids, except C. braconius, which departs from this norm in not being hyperparasitic. The presence of more diversified native parasitoids and hyperparasitoids from the Ichneumonoidea predicate a slow successive adaptation of the parasitoid fauna to the invasive host, Cameraria ohridella. 相似文献
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Pavela R 《Fitoterapia》2004,75(7-8):745-749
The methanol extracts of eight species of medicinal plants were tested for insecticidal activity in third instar larvae of Egyptian cottonworm (Spodoptera littoralis). All extracts showed a certain degree of larval toxicity. The extracts of Ocimum basilicum, Origanum majorana and Salvia officinalis appeared to be highly toxic. The extracts significantly affected the growth indexes [relative growth rate (RGR), efficiency of conversion of ingested food (ECI), efficiency of conversion of digested food (ECD)]. 相似文献
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Yu Mei Zhang Ning Hua Tan Guang Zhi Zeng Abiodun Humphrey Adebayo Chang Jiu Ji 《Fitoterapia》2009,80(6):361-363
A new norlignan, (2R,3R,4S,5S)-2,4-bis(4-hydroxyphenyl)-3,5-dihydroxy-tetrahydropyran (1), together with 9 known compounds were isolated from the branches and leaves of Taxodium ascendens. Their structures were mainly determined on the basis of MS, IR, 1D and 2D NMR spectral evidences. Methanol extract showed inhibitory activity on carbonic anhydrase II with an IC50 value of 4.27 µg/ml, acetone extract and methanol extract inhibited activity of cathepsin B with IC50 values of 2.12 and 3.71 µg/ml, respectively. 相似文献
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Contour hedgerows of multipurpose tree species in the sloping tea lands of Sri Lanka are expected to reduce soil erosion and
also add significant amounts of plant nutrients to the soil via periodic prunings. The objective of this experiment was to characterize the biomass decomposition pattern and quantify the
amount of nutrients added through prunings of six tree species (Calliandra calothyrsus, Senna spectabilis, Euphatorium innulifolium, Flemingia congesta, Gliricidia sepium and Tithonia diversifolia) currently being used in hedgerows associated with tea. Withered leaf and stem prunings (50 g) were enclosed in 2-mm litter
bags, placed at 5-cm depth and retrieved after one, three, six, nine and 12 weeks. Loss of initial dry weight, N, P and K
was measured. Single exponential decay function adequately described both dry weight and nutrient loss. Tree species differed
significantly in their rate of breakdown with decomposition constants (k) varying from 0.0299 to 0.2006 week−1 for leaves and from 0.0225 to 0.0633 week−1 for stems. Gliricidia showed the highest k for leaves with the rest in the following descending order: Senna > Tithonia ≥ Euphatorium > Calliandra > Flemingia. A similar pattern was observed for loss of all nutrients with Calliandra and Flemingia always having lower k values than the rest. Although N immobilization was not observed, immobilization of P and K was observed
during the first week of incubation in some species, particularly in stem prunings. Annual biomass of prunings differed significantly
between tree species in the following descending order: Calliandra > Senna > Flemingia > Tithonia > Gliricidia > Euphatorium. Calliandra added the greatest amount of nutrients annually to the soil with Euphatorium adding the least. Calliandra prunings provided the annual total K requirement and 49% of the N requirement of mature tea. However, none of the species
provided more than 5% of the P requirement. It is concluded that among the tree species tested, Calliandra and Flemingia are the most suitable for contour hedgerows in tea plantations of this agroclimatic region because of their higher soil nutrient
enrichment capacity and slower decomposition rates which would minimize leaching losses.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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Katsumi Togashi Yosuke Taga Kazunobu Iguchi Takuya Aikawa 《Journal of Forest Research》2008,13(2):127-131
Bursaphelenchus mucronatus Mamiya et Enda has been recovered for the first time from adults of the cerambycid beetle, Monochamus urussovi (Fischer), in Hokkaido, Japan. The nematode was also recovered from the inner bark of Picea jezoensis (Siebold et Zuccarini) Carrière and Abies sachalinensis (Fr Schmidt) Masters infested with M. urussovi larvae. PCR–RFLP analysis indicated that B. mucronatus in Hokkaido is the European type. 相似文献
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Steven Maranz Amadou Niang Antoine Kalinganire Djeneba Konaté Bocary Kaya 《Agroforestry Systems》2008,72(3):231-239
Baobab leaves form an important part of the local diet in Sahel countries and elsewhere in Africa. Existing leaf nutritional
data and agroforestry performance information are based solely on Adansonia digitata L., the baobab of continental Africa. The introduction potential of Adansonia species from the center of diversity in Madagascar and from Australia remains untapped. To assess this potential, the mineral
contents and B1 and B2 vitamin levels of dried baobab leaves were determined for five-year old trees of A. digitata, A. gibbosa (A. Cunn.) Guymer ex D. Baum, A. rubrostipa Jum. & H. Perrier (syn. A. fony Baill.), A. perrieri Capuron and A. za Baill. grown in an introduction trial in Mali. Nutritional data were evaluated against survival and vigor to identify promising
germplasm. Leaf vitamin and crude protein contents were highest in the Madagascar species, especially A. rubrostipa (B1 88 mg 100 g−1, B2 187 mg 100 g−1, protein 20.7% dry weight). However, the local species far outperformed the introductions in survival, tree height, basal
diameter and resistance to termites. We suggest grafting as a way of harnessing the vigor of well-adapted local baobab varieties
to the superior nutritional profiles of A. rubrostipa and others. Cross-species grafting tests in Adansonia were successful, thus creating new agroforestry possibilities with different scion/rootstock combinations. 相似文献
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Trees and shrubs as sources of fodder in Australia 总被引：2，自引：0，他引：2
E. C. Lefroy P. R. Dann J. H. Wildin R. N. Wesley-Smith A. A. McGowan 《Agroforestry Systems》1992,20(1-2):117-139
Experience with browse plants in Australia is briefly reviewed in terms of their forage value to animals, their economic value to the landholder and their ecological contribution to landscape stability. Of the cultivated species only two have achieved any degree of commercial acceptance (Leucaena leucocephala and Chamaecytisus palmensis). Both of these are of sufficiently high forage value to be used as the sole source of feed during seasonal periods of nutritional shortage. Both are also leguminous shrubs that establish readily from seed. It is suggested that a limitation in their present use is the reliance on stands of single species which leaves these grazing systems vulnerable to disease and insects. Grazing systems so far developed for high production and persistence of cultivated species involve short periods of intense grazing followed by long periods of recovery. Similar management may be necessary in the arid and semi-arid rangelands where palatable browse species are in decline. 相似文献
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Effects of soil water availability on seedling growth, dry matter production and allocation were determined for Gympie (humid coastal) and Hungry Hills (dry inland) provenances of Eucalyptus cloeziana F. Muell. and for E. argophloia Blakely (dry inland) species. Seven-month-old seedlings were subjected to well-watered (100% field capacity, FC), moderate (70% FC) and severe (50% FC) soil water regimes in a glasshouse environment for 14 wk. There were significant differences in seedling growth, biomass production and allocation patterns between species. E. argophloia produced twice as much biomass at 100% FC, and more than three times as much at 70% and 50% FC than did either E. cloeziana provenance. Although the humid provenance of E. cloeziana had a greater leaf area at 100% FC conditions than did the dry provenance, total biomass production did not differ significantly. Both E. cloeziana provenances were highly sensitive to water deficits. E. argophloia allocated 10% more biomass to roots than did E. cloeziana. Allometric analyses indicated that relative biomass allocation patterns were significantly affected by genotype but not by soil water availability. These results have implications for taxon selection for cultivation in humid and subhumid regions. 相似文献