Genetic variation, heritability and correlations of agro-morphological traits in tall fescue (Festuca arundinacea Schreb.)
Genetic variation, heritability and correlations of agro-morphological traits in tall fescue (Festuca arundinacea Schreb.)
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DOI：
10.1007/s10681-009-9887-6
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发表时间：
2009-06-01
期刊：
影响因子：
1.9
通讯作者：
Amini, Fatemeh
中科院分区：
文献类型：
--
作者：
Majidi, Mohammad Mahdi;Mirlohi, Aghafakhr;Amini, Fatemeh
为了研究高羊茅部分农艺性状的遗传变异、遗传力和遗传相关性，以遗传基础广泛的高羊茅种质资源中的25个亲本为材料，进行杂交，产生各自的半同胞家系。采用3次重复的完全随机区组设计，将无性系繁殖的亲本及其半同胞家系作为间隔单株进行种植，并于2006年和2007年对7个性状进行了观察。所研究性状的广义遗传力(h(N)(2))估计为中到高(h(B)(2)=0.43-0.80)。从后代分析和半同胞后代对双亲的回归(h(OP)(2))估计的狭义遗传力(h(N)(2))表明，这些性状的遗传变异在很大程度上受加性基因作用的控制。干物质产量(DMY)与株高、可育枝数、冠幅和春季生长呈显著正相关。除授粉天数外，亲本与子代各性状的相关系数均不显著。根据亲子回归分析，DMY选择的遗传增益较高，表明该性状具有遗传改良潜力。总体而言，高羊茅种群的大多数性状具有较高的遗传变异和中等的遗传力。综上所述，要提高牧草产量，应根据牧草产量构成因素进行选择。
To study the genetic variation, heritability and genetic correlations of some agro-morphological traits in tall fescue, 25 parents from a genetically broad-base germplasm were polycrossed and their respective half-sib families were generated. Clonally propagated parents and their half-sib families were grown as spaced single plants using a randomized complete-block design with three replications, and observed for seven traits in 2006 and 2007. The estimates of broad-sense heritability (h(n)(2)) were moderate to high (h(b)(2) = 0.43 - 0.80) for the traits studied. Narrow- sense heritability (h(n)(2)) estimates from analyses of progenies and from regression of half-sib (HS) progenies on parents (h(op)(2)) suggested that genetic variation for these traits was largely controlled by additive gene action. Association of dry matter yield (DMY) with plant height, number of fertile shoot, curbs width and spring growth was positive and significant. With the exception of number of days to pollination, correlation coefficients of the traits between the parents and offspring were not significant. Based on parent-offspring regression, genetic gain from selection for DMY was high, demonstrating genetic potential for improving this trait. Overall, there was high genetic variation and moderate heritability for most traits in the tall fescue populations evaluated. In conclusion, to improve herbage yield, selection would be more effective based on forage yield components.