共查询到20条相似文献，搜索用时 406 毫秒
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长茄制种,通过坐果处理、种茄成熟度及后熟度处理、单株留种果处理、试验密度及整枝方式处理,分别对种茄不同层次花型结实率、不同授粉时期坐果率和单果种子数、不同单株留种层次和留种方式、种茄不同成熟度和后熟度的千粒重及发芽率、不同整枝方式和密度等性状的参数进行了系统研究分析。结果表明:蕾期9～11时授粉、花期重复授粉可有效提高单株坐果率和单果种子数;单果种子数与千粒重呈负相关,单株留种层次不宜超过4层,否则影响当代及后代种子质量;种茄从授粉到采收60 d、后熟15 d的种子质量最好;单株坐果数11～12个的种子千粒重3.36 g,发芽率≥90%,采种量最高;以双秆整枝666.7m2种植密度2 700株制种产量最高。 相似文献
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旨在探讨番茄坐果部位、后熟度、发酵时间、种子晾晒方式对制种番茄种子发芽的影响,为提高杂交番茄种子发芽率及发芽质量提供科学依据。采用发芽势和发芽率判断番茄种子发芽力的强度,结果表明：番茄坐果部位、后熟度、发酵时间、晾晒方式等因素对番茄种子发芽力均有不同程度的影响。在田间温室条件下,番茄种子发芽最佳条件为：采果部位以中部果为主,争取上部果;后熟时闻应以2-3d为佳;发酵时间应以8h内为宜;种子应置阴处风干。 相似文献
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研究了不同瓜龄和后熟期对甜瓜杂交种种子产量和质量的影响。结果表明,随着瓜龄天数的延长,甜瓜种子的千粒重、发芽率、发芽指数和幼苗质量增加,瓜龄38d单瓜结实数最多;在后熟期0~10d,随着时间的延长,种子产量和质量逐渐升高,但后熟期15d时,单瓜结实数、发芽率和发芽指数下降。瓜龄38d,后熟期10d的甜瓜种子在保证质量的基础上,产量最高,可作为生产上制种的重要依据。 相似文献
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本研究选用19个亲本配制的6个组合,研究了 F_2代蛋白质含量的遗传变异,并分析了后代与亲本的关系。研究结果表明:并非所有组合 F_2代的蛋白质含量都呈正态分离;大豆蛋白质含量的遗传以加性效应为主;后代有广泛的变异,超亲现象普遍,遗传力高,早期世代选择效果好;MP 与 F_2显著正相关,在亲本和中亲值相似的条件下,遗传丰度大的组合后代遗传变异广泛。 相似文献
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Simple sequence repeat (SSR) markers have been shown to be a powerful tool for varieties identification in plants. However, SSR fingerprinting of sweetpotato varieties has been a little reported. In this study, a total of 1294 SSR primer pairs, including 1215 genomic-SSR and 79 expressed sequence tag (EST)-SSR primer pairs, were screened with sweetpotato varieties Zhengshu 20 and Luoxushu 8 and their 2 F1 individuals randomly sampled, and 273 and 38 of them generated polymorphic bands, respectively. Four genomic-SSR and 3 EST-SSR primer pairs, which showed good polymorphism, were selected to amplify 203 sweetpotato varieties and gave a total of 172 bands, 85 (49.42%) of which were polymorphic. All of the 203 sweetpotato varieties showed unique fingerprint patterns, indicating the utility of SSR markers in variety identification of this crop. Polymorphism information content (PIC) ranged from 0.5824 to 0.9322 with an average of 0.8176. SSR-based genetic distances varied from 0.0118 to 0.6353 with an average of 0.3100 among these varieties. Thus, these sweetpotato varieties exhibited high levels of genetic similarity and had distinct fingerprint profiles. The SSR fingerprints of the 203 sweetpotato varieties have been successfully constructed. The highly polymorphic SSR primer pairs developed in this study have the potential to be used as core primer pairs for variety identification, genetic diversity assessment and linkage map construction in sweetpotato and other plants. 相似文献
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YU Xiao-xia ZHAO Ning LI Hui JIE Qin ZHAI Hong HE Shao-zhen LI Qiang LIU Qing-chang 《中国农业科学(英文版)》2014,(2):310-315
Sweetpotato（Ipomoea batatas（L.）Lam.）breeding is challenging due to its genetic complexity.In the present study,interval mapping（IM）and multiple quantitative trait locus（QTL）model（MQM）analysis were used to identify QTLs for starch content with a mapping population consisting of 202 F1 individuals of a cross between Xushu 18,a cultivar susceptible to stem nematodes,with high yield and moderate starch,and Xu 781,which is resistant to stem nematodes,has low yield and high starch content.Six QTLs for starch content were mapped on six linkage groups of the Xu 781 map,explaining 9.1-38.8%of the variation.Especially,one of them,DMFN4,accounted for 38.8%of starch content variation,which is the QTL that explains the highest phenotypic variation detected to date in sweetpotato.All of the six QTLs had a positive effect on the variation of the starch content,which indicated the inheritance derived from the parent Xu 781.Two QTLs for starch content were detected on two linkage groups of the Xushu 18 map,explaining 14.3 and 16.1%of the variation,respectively.They had a negative effect on the variation,indicating the inheritance derived from Xu 781.Seven of eight QTLs were co-localized with a single marker.This is the first report on the development of QTLs co-localized with a single marker in sweetpotato.These QTLs and their co-localized markers may be used in marker-assisted breeding for the starch content of sweetpotato. 相似文献
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YU Xiao-xia ZHAO Ning LI Hui JIE Qin ZHAI Hong HE Shao-zhen LI Qiang LIU Qing-chang 《农业科学学报》2014,13(2):310-315
Sweetpotato （Ipomoea batatas （L.） Lam.） breeding is challenging due to its genetic complexity. In the present study, interval mapping （IM） and multiple quantitative trait locus （QTL） model （MQM） analysis were used to identify QTLs for starch content with a mapping population consisting of 202 F1 individuals of a cross between Xushu 18, a cultivar susceptible to stem nematodes, with high yield and moderate starch, and Xu 781, which is resistant to stem nematodes, has low yield and high starch content. Six QTLs for starch content were mapped on six linkage groups of the Xu 781 map, explaining 9.1-38.8% of the variation. Especially, one of them, DMFN 4, accounted for 38.8% of starch content variation, which is the QTL that explains the highest phenotypic variation detected to date in sweetpotato. All of the six QTLs had a positive effect on the variation of the starch content, which indicated the inheritance derived from the parent Xu 781. Two QTLs for starch content were detected on two linkage groups of the Xushu 18 map, explaining 14.3 and 16.1% of the variation, respectively. They had a negative effect on the variation, indicating the inheritance derived from Xu 781. Seven of eight QTLs were co-localized with a single marker. This is the first report on the development of QTLs co-localized with a single marker in sweetpotato. These QTLs and their co-localized markers may be used in marker-assisted breeding for the starch content of sweetpotato. 相似文献
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