通过3×2不完全双列杂交配制6个杂交籼稻组合,对和水稻开花期高温耐性相关的花药基部开裂长度和宽度(the length and width of basal dehiscence of anther,BDL,BDW)以及花药顶部开裂长度和宽度(length and width of apical dehisce...
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通过3×2不完全双列杂交配制6个杂交籼稻组合,对和水稻开花期高温耐性相关的花药基部开裂长度和宽度(the length and width of basal dehiscence of anther,BDL,BDW)以及花药顶部开裂长度和宽度(length and width of apical dehiscence of anther,ADL,ADW)4个性状进行遗传分析。结果表明,实验材料的不同组合间花药基部开裂性状存在极显著差异。BDL、BDW和ADW的遗传中加性和非加性效应都很重要。BDW和ADW均以利用一般配合力为主,双亲互作对BDL和ADL具有重要作用。BDL、BDW和ADW的广义遗传力较高,适合于早代选择,而ADL受环境影响较大。显著相关存在与BDL和BDW及ADL间,通过对BDL的选择可以达到对BDW和ADL选择的目的。本研究加深了对水稻花药开裂性状遗传机理的了解。
In this study, 34 molecular markers of starch synthesis-related genes were used to evaluate the genetic variation and population structure of 87 indica rice cultivars from different countries and regions. The results ...
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In this study, 34 molecular markers of starch synthesis-related genes were used to evaluate the genetic variation and population structure of 87 indica rice cultivars from different countries and regions. The results showed that a total of 80 alleles were amplified using 34 primer pairs, with an average of 2.5 alleles per locus. The allele number varied from 2 to 6 among various cultivars. Shannon's diversity index of molecular markers varied from 0.303 to 0.796, with an average of 0.539. Polymorphism information content (PIC) varied from 0.084 to 0.658, with an average of 0.295. The genetic similarity coefficients of 87 indica rice cultivars ranged from 0.265 to 0.990, indicating significant genetic differences of starch synthesis-related genes among different cultivars, but the variation frequency of alleles varied among different cultivars. Population structure analysis showed that these 87 indica rice cultivars were divided into three categories. Genetic differences were small within the same category but great among different categories. Moreover, indica rice cultivars with simple genetic components accounted for 39.1% and those with complex genetic background accounted for 60.9%. This study may not only provide theoretical basis for genetic improvement of rice starch quality, but also lay a solid foundation for subsequent association analysis of rice quality-related traits.
In this study, the genotypes of starch synthesis-related genes were systematically screened from different rice varieties using molecular markers. The results showed that starch synthesis-related genes were highly pol...
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In this study, the genotypes of starch synthesis-related genes were systematically screened from different rice varieties using molecular markers. The results showed that starch synthesis-related genes were highly polymorphic between indica and japonica varieties, as they greatly variated among indica varieties, but were conserved among japonica varieties. The genotypes of two indica varieties9311 and Minghui 63 were more similar to that of japonica varieties. Two or three alleles of six starch synthesis-related genes were found in 28 japonica parental varieties. Four genotypes of two soluble starch synthase genes, SSIIa and SSIIIa,were detected in 88 stable lines derived from the cross of Kanto 194/ Wujing 13 using molecular markers.
The research detailed history and status quo of global grain and rice production in terms of growing area, per unit area yield and total yield and performed analysis on the role of rice production in China and world g...
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The research detailed history and status quo of global grain and rice production in terms of growing area, per unit area yield and total yield and performed analysis on the role of rice production in China and world grains. It can provide useful references for researchers on rice breeding.
[Objective] This study aimed to reveal the effects of Aphelenchoides besseyi infection on different rice varieties(lines).[Method] By field observation and indoor phenotypic investigation,four conventional japonica ...
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[Objective] This study aimed to reveal the effects of Aphelenchoides besseyi infection on different rice varieties(lines).[Method] By field observation and indoor phenotypic investigation,four conventional japonica rice varieties(lines) and japonica rice restorer line R161 under natural onset conditions were observed and analyzed.[Result] After being infected by ***,different rice varieties(lines)exhibited various ***,Ning 1707,Ning 1818,Zhendao 88 and Nanjing 9108 had withered leaf tips and exhibited the symptoms of "small grains and erect panicles";japonica rice restorer line R161 only had withered leaf tips without symptoms of "small grains and erect panicles",and the withering symptoms occurred in flag leaf tip,whole flag leaf and top second leaf,*** being infected by ***,all the experimental materials could sprout normally,but their plant height,panicle length,seed-setting rate and 1 000-grain weight were affected to varying *** addition,after being infected by ***,various symptomatic tissues of R161 exerted different effects on rice ***,panicles with withered and twisted whole flag leaf were most affected.[Conclusion] This study provided the basis for further exploration of the damages of *** infection to rice and development of corresponding control measures.
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