共查询到20条相似文献,搜索用时 62 毫秒
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于2012年10月在广西农业科学院蔬菜研究所中试基地,以经田间自然发病和苗期接种鉴定而来的抗病自交系“806”和感病自交系“810”为材料,配组杂交和F1代自交,获得正反交F1和F2种子,然后采用苗期接种鉴定法同时调查亲本、正反交F1、F2的发病情况,最后利用x2适合性检验分析抗性遗传规律,以选育抗白粉病密本南瓜新品种,解决生产中南瓜白粉病危害问题.结果表明:正反交F1代的病情指数均接近感病亲本“810”,而明显高于抗病亲本“806”;正反交F2代的抗感比例分别为1∶2.73和1∶2.72,x2检验均达显著水平,据此推定密本南瓜白粉病抗性符合单基因控制的隐性遗传规律. 相似文献
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为明确云南省昆明市团结乡地区南瓜白粉病病原菌种类及生理小种,通过病原菌孢子形态观察、分子鉴定及国际通用的甜瓜白粉病生理小种鉴别寄主与标准鉴定体系,对该地区的南瓜白粉病病原菌及生理小种进行鉴定。结果表明,该白粉病菌孢子形态呈椭圆形,内有纤维状体;rDNA-ITS序列与单囊壳属(Podosphaera xanthii)ITS序列聚为一类,一致性高达99%;病原菌样本对鉴别寄主的抗感反应与单囊壳白粉菌生理小种2France表现一致。因此,引起昆明市团结乡地区南瓜白粉病的病原菌为单囊壳属白粉病菌(P. xanthii)的生理小种2France。 相似文献
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草莓品种白粉病抗性的田间鉴定 总被引:3,自引:0,他引:3
草莓抗白粉病品种的鉴定是抗病育种的重要环节。田间试验表明:草莓群体中广泛存在抗白粉病品种。感病品种的发病率和病情指数也存在较大差异,为抗白粉病品种的选育提供了可能。 相似文献
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A study was undertaken to investigate the inheritance of powdery mildew resistance in muskmelon grown on river beds, under natural epiphytotic conditions. ‘Campo’ and ‘PMR 6’ were selected as resistant parents, ‘Gulfstream’ as moderately resistant and ‘Lucknow Safeda Selection’ as susceptible parents. The genotypes of the two resistant parents have locus/loci which are similar in conferring resistance. The moderately resistant parent might have an allele at least in one locus different from that in the resistant parent. Two effective factors were found to be differentiating disease reaction between the susceptible and the resistant parents. The direction of the genetic effects showed that it is possible to get from the cross between the susceptible and resistant parents, segregants with the desired level of resistance. 相似文献
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James Boyd Maclachlan 《Scientia Horticulturae》1978,8(1):43-49
Results are presented for levels of mildew infection in seedlings of the cultivated strawberry in years of severe outbreaks of powdery mildew. Evidence is shown for the presence of general and specific effects in mildew inheritance and of differences in breeding-value of close relatives, in this case full-sibs. The results also indicate that a maternal effect on mildew susceptibility exists, and that while ‘Cambridge Vigour’ is more susceptible than ‘Cambridge Favourite’, and gives the more susceptible progeny, there may be either a maternal effect for susceptibility transmitted through ‘Cambridge Favourite’, or an effect for resistance transmitted through ‘Cambridge Vigour’. 相似文献
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Craig A. Ledbetter Steven A. Lee 《The Journal of Horticultural Science and Biotechnology》2019,94(4):460-467
The availability of powdery mildew-resistant raisin accessions will lower grower production costs and enhance the environment through reduced fungicide use. To achieve this objective, backcrossing has been employed with Vitis romanetii as the source of non-race-specific powdery mildew resistance. Initial crosses of powdery mildew-resistant F1 hybrid B36-45 with seeded raisin cultivars ‘Rangspray’ and ‘Raisin de Palestine’ yielded seedless powdery mildew-resistant first-generation backcross selections C87-41 and C87-106, which were used to develop second-generation backcross populations. Principal component analyses consistently identified ‘wrinkle,’ ‘meatiness,’ ‘product attractiveness’ and ‘skin persistence’ as being the quality characteristics most important in discriminating among powdery mildew-resistant raisin accessions and commercial raisin cultivars. Raisin quality ratings were much improved across most evaluated characters in second-generation backcross families as compared with parental powdery mildew- resistant accessions C87-41 and C87-106. After two generations of backcrossing, powdery mildew-resistant raisin selections were identified with product quality characteristics similar to those of commercial raisin cultivars. 相似文献
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