Phenotypic variance of black oat growing in crop seasons reveals genetic effects predominance

Abstract: This work aimed to determine variance components and genetic parameters, as well as phenotypic, genetic and environmental correlations among black oat (Avena strigosa) families grown in different crop season. Seventy-six black oat families and three controls (BRS Madrugada, BRS Centauro, BRS 139 Neblina) were evaluated in two crop seasons (2016 and 2017), using families with intercalary controls experimental design. The results reveled high potential of black oat families to compose a breeding program, due to families and controls variance were similar, variance components expressed greater genetic variance origin for crop season. Panicle weight and panicle grain weight presented high heritability and, these are correlated with panicle length. Thus, these traits can be used to select superior genotypes. Divergent meteorological conditions between crop seasons expressed few variations among phenotypic, genetic and environmental correlations, and it did not alter magnitude and sense of phenotypic and genetic correlations.

摘要：本研究旨在明确不同种植季下种植的黑燕麦（Avena strigosa）家系的方差组分、遗传参数，以及表型、遗传与环境相关系数。本研究于2016和2017年两个种植季，采用间插对照试验设计，对76个黑燕麦家系及3个对照品种（BRS Madrugada、BRS Centauro、BRS 139 Neblina）开展评价。研究结果显示，黑燕麦家系具备优异的育种应用潜力：家系与对照的方差水平相近，且方差组分表明不同种植季间存在显著的遗传变异来源。穗重与穗粒重均表现出较高的遗传力，且二者与穗长存在显著相关性，因此可利用这些性状筛选优良基因型。两个种植季间迥异的气象条件仅对表型、遗传与环境相关系数造成了极小的影响，并未改变表型与遗传相关系数的大小与方向。