共查询到20条相似文献，搜索用时 31 毫秒
1.
《Plant Production Science》2013,16(4):298-304
AbstractThe effects of gravistimulation direction on tuber formation and amyloplast distribution in the tuber tips of Chinese yam were investigated. Tubers placed vertically for either 2 or 14 d elongated in the direction of gravity vector. The subapical parts of tubers that were positioned horizontally for 2 d curved slightly toward the gravity direction, and such tubers elongated downward after 14 d. In tubers that were inversed for 14 d, the tips bent and eventually elongated in the direction of the gravity vector. These results indicated that the subapical part of the tuber was the initial site of curvature in response to gravistimulation. Microscopy and measurement of amyloplast sedimentation ratios showed that many amyloplasts sedimented downward in each tip cell of tubers that were placed vertically, inversely or horizontally. The results indicated that amyloplast sedimentation direction corresponded with the eventual direction of tuber elongation under different gravistimulation orientations. Tubers rotated at 90° intervals every day for 14 d did not have an elongating shape and grew multiple tips at different angles. In the rotated tubers, amyloplasts dispersed within the tip cells. These results showed that proper sedimentation of amyloplasts would be essential for the normal elongation and formation of tubers. The results of this study supported the possibility that sedimentable amyloplasts in the tuber tip were involved in gravity sensing and tuber formation. 相似文献
2.
Summary In 1983 and 1984 there were reports in Norway of more severe late blight infection than usual on tubers of cv. Pimpernel,
a cultivar without R-genes known to be somewhat resistant to both haulm and tuber infection. Results from routine tests confirmed
earlier experience that cv. Pimpernel shows stable resistance to tuber late blight, although the ranking of cultivars may
vary between years.
In experiments during three harvest seasons tubers of different cultivars were inoculated with isolates ofP. infestans obtained from stocks of cv. Pimpernel with severe tuber late blight and with other isolates. In these experiments the isolates
from cv. Pimpernel caused more rot on tubers of Pimpernel than did other isolates. 相似文献
3.
Nitrogen fertilization and irrigation affects tuber characteristics of two potato cultivars 总被引：4，自引：0，他引：4
G. Bélanger J. R. Walsh J. E. Richards P. H. Milburn N. Ziadi 《American Journal of Potato Research》2002,79(4):269-279
Nitrogen fertilization, irrigation, and cultivars affect tuber characteristics such as tuber size, specific gravity, and N concentration. Few studies, however, have investigated the interaction of irrigation and N fertilization on the tuber characteristics of potato cultivars, particularly in Atlantic Canada. The objective of this on-farm study, conducted at four sites in each of three years, 1995 to 1997, was to determine the effects of supplemental irrigation and six rates of N fertilization (0-250 kg N ha-1) on the number of tubers per plant, the average fresh tuber weight, tuber N concentration, nitrate (NO3-N) concentration, and specific gravity of the cultivars Shepody and Russet Burbank. Nitrogen fertilization increased the average fresh tuber weight, tuber N and N03-N concentrations, and decreased specific gravity. Effects of increasing N fertilization on tuber characteristics were often more pronounced for Shepody than for Russet Burbank, and for irrigated than for non-irrigated conditions. Shepody had greater average fresh tuber weight and tuber N concentration, lower specific gravity, and fewer tubers per plant than Russet Burbank. Supplemental irrigation increased the average fresh tuber weight and the number of tubers per plant, but it had a limited effect on specific gravity and tuber N and NO3-N concentrations. Tuber NO3-N con centration and specific gravity were strongly related to tuber N concentration, which in turn depended primarily on N fertilization. Incidents of lowest specific gravity and highest NO3-N concentration occurred with a relative yield close to or equal to 1.0. We conclude that the risks of low specific gravity and high tuber NO3-N concentration are greater when fertilization exceeds the N requirements to reach maximum tuber yield. 相似文献
4.
M. Susnoschi 《Potato Research》1981,24(4):381-388
Summary Locally grown seed tubers of nine varieties developing in spring or in autumn in a semi-arid region were examined for length
of dormancy and for sprouting response. In spring, high temperatures during the last part of tuber development markedly shortened
the dormant periods of tubers in comparison with tubers of the same varieties developing in autumn.
The sprouting behaviour of tubers indicated that it is a varietal characteristic influenced by the change in environmental
conditions during tuber development and storage. On tubers developing in spring and stored at high temperatures, three sprouting
patterns were defined: a) apical dominance, characterized by the evident development of the apical sprout and less than 10%
sprouting of the non-apical buds; b) apical influence, the apical sprout well developed and 10–20% sprouting of the non-apical
buds; and c) simultaneous sprouting of 3 or 4 sprouts of similar size per tuber.
It is suggested that apical dominance is a relative rather than an absolute phenomenon. The extent of dominance depends upon
the variety's response to the high temperatures during tuber growth and storage.
Contribution from the Agricultural Research Organization, Beit Dagan, Israel, 1979 Series, No 301. 相似文献
5.
M. Susnoschi 《Potato Research》1981,24(4):371-379
Summary In the Negev area of Israel potatoes are grown in two seasons of the year: spring and autumn. Locally grown seed of cv. Up-to-Date
prepared for the autumn season are grown in the spring under high-temperature conditions during the last part of the growth
period. The response to storage temperature treatments consisted of different degrees of sprouting. Temperatures that encouraged
bud development (12–22°C) shortened the dormant period of the tubers by about a month, and usually there is clear apical dominance.
However, increasing length of the apical bud was positively correlated with storage temperature. Partial loss of apical dominance
was obtained when the tubers were held at a low temperature (4°C) for at least two months after lifting. After transfer of
the tubers to high temperatures for another month, there were 3 or 4 sprouts per tuber. The physiological age of seed tubers
developing in the semi-arid region is discussed.
Contribution from the Agricultural Research Organization, Beit Dagan, Israel 1979 Series, No 300. 相似文献
6.
Summary The growth and development patterns of the potato (Solanum tuberosum L.) cv. Maris Piper are compared for one- and four-eyed whole tubers, and four single-eyed seed-pieces of two different weights.
In the multi-sprouted tubers some eyes, especially from the base of the tuber, failed to emerge due to the re-establishment
of apical dominance after planting. Stems emerged first from eyes at the apex of the tuber, and had a larger leaf area per
eye during the early harvests, than stems arising from other parts of the tuber. These differences diminished as the canopy
expanded.
The numbers and sizes of daughter tubers at the final harvest were similar for all four-eyed treatments. Single-eyed cores
of 10 g are recommended for effective control of stem numbers with uniform canopy production. 相似文献
7.
Summary Plants were grown in the field from seed pieces of potato cultivars injected with ring rot bacteria (Corynebacterium sepedonicum). Symptoms were produced with both 18 and 180 colony forming units (cfu) on cvs Norchip and Red Pontiac and with 180 cfu
on cv. Belrus plants. Tuber symptoms were detected in all cultivars except Belrus and Teton. Tuber progeny produced plants
that developed top symptoms on all cultivars except those of cv. Nooksack, Russet Burbank, and Teton. Tuber progeny of the
second crop produced both plants and tubers with symptoms developing only in the cv. Nooksack. In another 3-year experiment,
variability in the disease response of selected cultivars and lines was examined following knife-inoculation of tuber seed
with a high level of ring rot bacteria. Significant correlations between top and tuber symptoms were detected, but they were
not high enough to make unnecessary the examination of both top and tuber symptoms in ring rot disease selection studies.
Contribution no. 3879111 相似文献
8.
J. P. D. Wanasundera G. Ravindran 《Plant foods for human nutrition (Dordrecht, Netherlands)》1994,46(1):33-39
The nutrient and antinutrient components of tubers from seven cultivars ofDioscorea alata were determined. The average crude protein content ofD. alata tubers was 7.4%. Starch (75.6–84.3%) was the predominant fraction of the tuber dry matter. Significant differences in crude protein and starch contents were observed among cultivars. Vitamin C content of the yam tubers ranged from 13.0 to 24.7 mg/100 g fresh weight. The results showed yams to be reasonably good sources of minerals. Phytic acid contents of the yams were low, with values ranging from 58.6 to 198.0 mg/100 g dry matter. Total oxalate levels in yam tubers were found to be in the range of 486–781 mg/100 g dry matter, but may not constitute a nutritional concern since 50–75% of the oxalates were in the water-soluble form. The overall results are suggestive of the nutritional superiority of yams compared to other tropical root crops. 相似文献
9.
The nitrogen supply plays an important role in achieving quality characteristics in organic potato farming. Different defoliation systems of ryegrass–clover may influence the amount of fixed nitrogen available to the tubers. In a field experiment, the effect of different defoliation systems (cutting, mulching and a combination of them) of the pre-crop ryegrass–clover on selected quality attributes of organically grown potatoes, destined for processing into French fries (cv. Agria) or crisps (cv. Marlen), were conducted in two consecutive years (2003 and 2004). Parameters studied included compounds related to the sensory properties of potato food (tuber dry matter, starch, reducing sugars) as well as nutritional quality (nitrogen, minerals). Selected agronomic parameters such as total tuber yields and tuber size distribution were also compared. Furthermore, the influence of additional slurry fertilisation and 4 months of storage on these parameters were investigated. Total yields and portion of tuber yield 50–60 mm were significantly affected by the pure mulching variant in 2003. In 2003, the starch concentration at harvest, as well as after storage, was above the required minimum of 22% (cv. Marlen) and 19% (cv. Agria), while in 2004, this was slightly beneath these values. In 2004, a significant increase of starch concentration by the pure cutting variant was observed. In both years, mulched ryegrass–clover caused a decrease in tuber DM contents of 2.10 and 3.54%, respectively, compared to the cutting systems. Fertilisation significantly decreased DM and starch concentration. In 2004, the reducing sugar concentration of tubers of cv. Marlen from the pure cutting system was with 2.1 g kg?1 FM above the required maximum of 1.5 g kg?1 for crisps. In addition, storage led to a three to fivefold increase of reducing sugars concentrations in the tubers in this year. After slurry fertilisation, 8.8% higher N contents and up to 36% higher K concentrations were measured. Mulching of the pre-crop combined with slurry application led to an up to 61% higher tuber K concentration compared to the cutting system. The results indicate that different defoliation systems of the pre-crop ryegrass–clover and slurry fertilisation had only minor effects on internal tuber quality attributes. Quality parameters were more affected by the prevailing weather conditions in combination with the genotype of different potato cultivars. 相似文献
10.
脱毒马铃薯扩繁技术初探 总被引：1，自引：0，他引：1
本试验以早熟品种东农３０３、中熟品种系薯１号和晚熟品种晋薯７号为试验材料，采用Ｌ１２（４×３￣２）正交试验法，分室内和室外两组同时进行试验，结果表明，出芽天数随着温度的上升而减少；大薯块出芽数极显著高于中小薯块；出芽数则随着掰芽次数的增加而减少；系薯１号的出芽数明显高于晋薯７号，与东农３０３差异不显著．产量结果表明，主因素为品种；其次为薯块大小；掰芽次数间差异不显著；母薯则极显著高于掰芽次数．综合结果分析，脱毒马铃薯掰芽扩繁是一项节省种薯，提高繁殖系数的有效措施；以选择适宜当地种植的高产高效和大薯块掰芽为好；三次掰芽扩繁移栽和母薯直播是可行的马铃薯扩繁技术措施． 相似文献
11.
Cody J. Dean Lisa O. Knowles N. Richard Knowles 《American Journal of Potato Research》2018,95(6):622-641
Tuber shape phenotype is an important determinant of raw product (≥7.6-cm-long French fries) recovery for frozen processing. Tuber length-to-width (L/W) ratios ≥1.8 translate to maximum yield of raw product; however, some cultivars produce tubers with much lower L/W ratios. While gibberellin (GA) can be used to elongate tubers, it also decreases tuber size and can thereby attenuate raw product recovery. We investigated the utility of GA and naphthaleneacetic acid (NAA) combination treatments for modifying tuber set, size, and shape to increase yield of raw product from ‘Payette Russet’ and ‘Alturas’; two late-season frozen-processing cultivars that often produce tubers with undesirably low L/W ratios. Models describing L/W ratio and fry yield by tuber size class were developed to translate total U.S. No. 1 tuber yields (>113 g) into yield of raw product. Increases in the L/W ratios of 113–284-g tubers had a greater effect on recovery of French fries (% fresh wt) than for tubers >284 g. Undersize (<113 g) and oversize (>340 g) tubers yielded 0 and 96% fries, respectively, regardless of L/W ratio. GA applied as a seed treatment effectively hastened emergence and altered tuber shape by increasing the L/W ratios of ‘Alturas’ and ‘Payette Russet’ tubers, enhancing total fry yield for the 113–340-g tubers by 24–46%, depending on concentration and application technique (dip, spray, in-furrow). However, GA also decreased apical dominance and shifted tuber size distribution away from >284-g tubers toward higher yields of <170-g tubers, erasing the gains in fry yield when all size classes (>113 g) were considered. When combined with GA, NAA maintained apical dominance, attenuated the shift in tuber size distribution, had no effect on the GA-induced increase in tuber L/W ratio, and only partly moderated the GA-induced stimulation of plant emergence. Raw product yield from ‘Payette Russet’ increased 12–39% in spray application trials by using NAA to confine the effect of GA to tuber shape and limit the loss of U.S. No. 1 tubers to undersize. Increases in tuber L/W ratio with GA/NAA seed treatments translated to increased yield of fries only when the relative concentrations were adjusted to minimize loss of >284-g tubers and gain in undersize tubers, as dictated by cultivar sensitivity to GA. ‘Alturas’ was less sensitive to GA than ‘Payette Russet’ for shifts in tuber size distribution but not shape, resulting in 17% increase in raw product with GA alone in pre-plant seed spray application studies. GA/NAA combination treatments provide an effective approach to manipulate tuber size distribution and enhance the yield of raw product for frozen processing in cultivars with a rounder tuber shape phenotype. 相似文献
12.
Sławomir Wróbel 《Potato Research》2015,58(4):329-342
The aim of this research was to assess the rate of increase in the level of tuber infection by PVY, PVM, and PLRV during three consecutive years of multiplication in the field for 17 new cultivars registered in Poland in 2009–2011 and for two cultivars not listed in the registry but popularly cultivated. The research was conducted in Bonin near Koszalin (north-western Poland) in 2010–2013. Tuber infection was assessed using DAS ELISA in a grow-out test in the winter-spring period. Among the 19 cultivars examined, eight had high resistance to PVY (above grade 8 on a scale of 1–9); during the 3-year research period, they were not infected. Also, cv. Gawin seemed more resistant than previously assumed. In contrast, cvs. Hermes and Sylvana, which were rated in the Netherlands as quite resistant, were clearly very susceptible (grade 3–4) in Polish conditions, as within 2 years 100% of tubers were infected with this virus. The greatest susceptibility to PVM was shown by cvs. Danuta and Stasia, 50% of which were infected, despite moderate exposure to the virus. Cultivars Zenia, Etiuda, Jubilat, and Viviana appeared very resistant to PVM as the number of infected tubers did not exceed 5%. PVM was not detected in the tubers of cvs. Bursztyn, Gustaw, and Legenda, which confirmed that these cultivars possess the Rm gene. Not all cultivars regarded susceptible (grade 3–4) to PLRV were infected. The virus was not found in tubers of cv. Bursztyn, while in cv. Hermes, assessed in the Netherlands as being quite resistant, almost 40% of tubers were infected. 相似文献
13.
K. Goto 《Potato Research》1981,24(2):171-176
Summary Total sugar, reducing sugar, glucose, fructose, and sucrose of scabbed (Streptomyces scabies) and scab-free harvested tubers of several potato cultivars were analysed in four portions (pell and tube flesh separtely,
from basal and apical halves), and also in small whole growing tubers.
The peel of scabby harvested tubes had higher reducing sugar (glucose and fructose) contents than that of corresponding scab-free
tubers. The sugar contents in the flesh and in small growing tubers did not show significant difference beween the scabbed
and scab-free state.
Tubers of scab-susceptible cultivars had more scab and a higher reducing sugar content than those of resistant cultivars.
The results indicate that the contents of reducing sugar (glucose and fructose) in tuber peel are positively correlated with
scab severity. 相似文献
14.
Summary Variation in aggressiveness to tubers among isolates ofPhytophthora infestans sampled from three potato growing regions in the Netherlands was compared. Variation in the ability to infect tubers of cv.
Bintje was found between isolates of each of the three regional populations. The most aggressive isolate of the old population
matched the average level of the new population in its ability to infect tubers. As a consequence, the commonly used reference
isolate VK 6C can no longer be considered to be representative of the present population ofP. infestans. Therefore it is recommended that testing tuber resistance for the official list of potato cultivars with this isolate should
be discontinued.
Tuber infection and subsequent spread of the fungus in the tuber tissues were not found to be correlated. The components of
tuber pathogenicity studied were not correlated to pathogenicity factors in the foliage, as measured under growth chamber
conditions. 相似文献
15.
Summary The resistance of ten potato cultivars (Agria, Ajax, Désirée, Liseta, Kennebec, Majestic. Monalisa, Prima, Spunta and Tonda
di Berlino) toPhytophthora infestans was analyzed in vitro using 8 fungal strains. An assay based on electrolyte leakage was used for screening leaves and tuber
tissues with fungal culture filtrates. With almost all cultivars the resistance of leaves did not correlate with the resistance
of tubers. Cv. Ajax appeared the least susceptible in both leaf and tuber tests, while the cv. Prima was the most susceptible
in tuber tests. 相似文献
16.
Foliar and tuber blight caused by Phytophthora infestans accounts for significant losses in potatoes in field and storage. Nevertheless, limited research has been published on the
effects of cultural practices on late blight control. Field experiments were conducted in two years on Howard gravely loam
soil in New York State to evaluate the effectiveness of mulching using oat straw and hilling in preventing tuber blight infection
for cvs Allegany and Katahdin. Potato hilling and mulching had little effect on foliar blight development. The cultivar affected
the disease development in the foliage, with cv. Allegany showing lower foliar late blight than cv. Katahdin. Tuber blight
incidence averaged 25% for cv. Allegany and 3% for cv. Katahdin in hilled plots, while in the mulched plots the incidence
of tuber blight averaged 33% for cv. Allegany and 10% for cv. Katahdin. The straw hay mulch was ineffective in tuber blight
control. Tubers set at a soil depth of more than 7 cm had lower tuber blight incidence than shallow tubers set at a depth
of less than 7 cm. In both years, hilling provided partial protection of tubers but its effectiveness was limited in the presence
of favourable conditions for late blight development. Even though large hills had proportionally a lower tuber blight incidence
than medium-sized hills, the difference between the different hill sizes was not significant. These studies suggest that the
use of cultivars with foliage resistance to late blight in combination with cultural practices may partially reduce the incidence
of tuber blight.
Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information
and does not imply recommendation for endorsement by Cornell University or the US Department of Agriculture. 相似文献
17.
《Plant Production Science》2013,16(4):304-310
AbstractWe examined the mechanism of reserve mobilization in Japanese yam seed tubers and eddo seed corms on and after sprouting. The decomposition of starch in pith parenchyma cells of Japanese yam tubers and eddo corms progressed from the region distant from vascular bundles to that adjacent to vascular bundles. In eddo corms, the starch also decomposed from the proximal to the distal region adjacent to the sprout or regenerate plant body. In the yam tubers, the decomposition process was similar in the proximal, middle and distal regions. The first step in the reserve mobilization in pith parenchyma cells was the decomposition of the amyloplast envelope. Subsequently, starch granules decomposed. In Japanese yam tubers, the envelope and starch granules started to decompose from the peripheral regions of the amyloplasts. The observation of soluble polysaccharides, which was the decomposition product of starch granules, was made possible by the quick freezing-vacuum freeze-drying method. By this method, we demonstrated that the soluble polysaccharides in the parenchyma cells decomposed and decreased in density. In addition, the mucilage in the mucilage duct started to decompose and decreased in density from the proximal to the distal part of the corm and also from the periphery to the center of the duct. It was shown that not only starch mobilization but also mucilage mobilization mainly supported sprouting and the growth of the regenerate plant body during about the first half of the vegetative stage. 相似文献
18.
Summary Minitubers of cultivars Agria and Liseta were harvested from the same plantlets on three dates. After each harvest, tubers
were dried (1 day), cured (13 days) and cold stored at 2 °C in darkness and 80 % RH. Their performance was studied 65, 128,
191, 254, 317, 380, 443, 506 and 569 days after harvest. Minitubers (1–2 g) were planted in pots and grown for 8 weeks in
a controlled environment. After 191 days of storage their growth was still extremely poor. In both cultivars, tallest plants
and largest leaf areas per plant were observed in plants from tubers from the second and third harvests that had been stored
for 317 days. Highest stem numbers, yields (total dry matter, tuber fresh weight) and harvest indices were achieved with 443
days storage with cv. Agria and 569 days storage with cv. Liseta. Tubers from the first harvest behaved slightly differently. 相似文献
19.
D. Levy 《Potato Research》1983,26(4):315-321
Summary The effect of repeated short periods of water stress during the hot season on six potato cultivars was investigated. The number
of tubers per plant tended to decrease in response to water stress in cultivars which had more than 9.8 tubers per control
plant (Désirée, Alpha, Elvira). In the other cultivars, no consistent effect of water stress on tuber number per plant was
observed. Except for Spunta, the percentage of large tubers (>60 g/tuber) was reduced in the water-stressed plants. Consequently,
the average weight of these tubers was greater than that of tubers harvested from the unstressed plants, indicating that the
sink force of the individual tuber was not impaired by drought. However, tuber yield per plant was reduced due to drought
in all cultivars tested.
The smallest decrease in dry matter accumulation as well as the greatest lowering of the osmotic potential in the tuber tissue
was found in Alpha. No consistent effect of water stress on the percentage of misshapen and sprouting tubers was observed,
indicating the marked effect of the high temperature on these traits.
Contribution from the Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel, No 310-E, 1981 series. This
investigation was sponsored by a grant from the Ministry for Development Cooperation of the Netherlands. 相似文献
20.
The effect of early blight on tuber yield of two potato (Solanum tuberosum L.) cultivars (Russet Burbank and Norland) was evaluated using number and timing of applications of three chemicals to generate different disease epidemics in 1981 and 1982. Under the non-irrigated farming conditions in Minnesota, there were no significant differences among captafol, triphenyltin hydroxide and maneb-Zn in blight control to increase yield. Of the five spray schedules tested, a 7–10 day spray schedule initiated when blight severity exceeded 0.01%, and a 7–10 day schedule initiated when blight was found above the lower third of the plant, generally gave significant, positive yield responses with all three chemicals. At Rosemount in 1982, the greatest yield increases (relative to unsprayed) obtained were 34.9% and 48.6% in total tuber yields for Norland and Russet Burbank, respectively. At Rosemount in 1982, the highest yield increases (relative to unsprayed) obtained were 92.2% and 56.6% in total tuber yields for Norland and Russet Burbank respectively. At Grand Forks in 1981, the highest yield increases were 126.8% and 34.6% in total tuber yields for Norland and Russet Burbank respectively. Across all three experiments, maximum yield losses (percentage of [[yield of ‘healthy’—yield of unsprayed check]/yield of ‘healthy’’]) were 58.4% (US #1 tubers) and 55.9% (total tubers) for cv. Norland and 34.4% (US #1 tubers) and 36.2% (total tubers) for cv. Russet Burbank. 相似文献