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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。 | |
The ploidy of plants in the BC2F2 Bulk hybrid generation was identical to the weedy parental species, B.
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Breeding schemes may involve recurrent, pedigree and bulk hybrid selection.
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A bulk hybrid population, CCXLII was investigated for hordein variation and reaction to powdery mildew.
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| | The synthetic heterosis index (I*=P*'b) for measuring the aggregate genotype of heterosis (C*=g*'a) was constructed by consulting Smith-Hazel's selection index.The synthetic heterosis index can be considered as a new parameter to measure the heterosis of multiple quantitative characters of crops.In order to study the relation between the fix-netic divergence and heterosis,the value of the synthetic heterosis index of 8 quantitative characters with 35 crosses in rice was estimated by using this method.The ge... | | 本文参照综合选择指数的构成,即通过极大化聚合基因型值H=与选择指数I=的相关而得到的ι,对杂种群体的多性状的离中优势值进行分析,得出了评判中的多个性状的选择指数,即文中定义的综合杂种优势指数。本文以35个水稻杂交组合为材料测定了8个数量性状的综合杂种优势指数值和亲本间的遗传距离及典范遗传距离。相关分析表明,产量优势同遗传距离及典范遗传距离的相关性达到了显著水平(0.05),而综合杂种优势指数与这两种遗传距离的相关性达到了极显著水平(0.01)。综合杂种优势指数可以作为测定多个数量性状杂种优势的一个新的参数。 | | 文摘来源 | | The paper proposed a concept of comprehensive hybrid vigor and gave the multiple statistical analysis method to evaluate the comprehensive hybrid vigor in simple cross trial. The comprehensive hybrid vigor of strain i crossed with strain j can be calculated as follows, | | 一般有多个性状影响家畜生产性能,且各性状相对经济价值不同,所以按单性状杂种优势来评价某杂交组合的优劣是不全面的。本文提出了综合杂种优势的概念和单杂交试验中综合杂种优势的多元分析方法。记杂种ij第1性状的杂种优势为hijl,其相对经济价值为W_1,若育种目标性状共有L个,我们把品系i与品系j杂交产生的杂种的综合优势定义为: 本文根据线性模型的理论给出了Hij的最优线性无偏估计(BLUE)及其置信区间。 | | 文摘来源 | | The multrivariate analysis method and the concept of comprehensive heterosis for livestock three-way cross text are given in our paper. We difine the comprehensive heterosis as H_F=W_ih_i+……+W_Lh_L, where h_L is the Lth trait's hybrid vigor, W_L is the relative economic weight given to the Lth trait, L=1, 2…L. Based on the generalized least squares estimate method, we give the best linear unbiased estimate and the confidence inferual of H_F, for three-way cross here, | | 本文给出了动物三元杂交试验的多元分析方法和综合杂种优势的概念。我们把综合杂种优势定义为H_F=W_1h_1+……+W_Lh_L,这里h_L是第L个目标性状的杂种优势,W_L是其相对经济价值,l=1,2,……L。根据广义最小平方理论,本文给出了三元杂交试验中的H_F的最优线性无偏估计及置信区间。 | | 文摘来源 | |   | | << 更多相关文摘 |
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