木薯种质基因型与环境互作分析

为加强木薯现有选育材料和引进种质的研究利用,准确评价各种质产量相关性状的稳定性和适应性,以木薯主栽品种华南8号(SC8)和华南205号(SC205)为对照,选用138份选育材料和8份瑞士引进新种质,应用AMMI模型对连续3年的干物质率、收获指数的遗传方差、环境方差和遗传与环境(G×E)互作进行探讨。结果表明:(1)比对照SC8的干物质率和收获指数更高且更加稳定的种质分别有4份和6份,比对照SC205的干物质率和收获指数更高且更加稳定的种质分别有61份和12份;(2)对干物质率的分析中有67份种质比SC8和有132份种质比SC205对不同年度环境的适应性更好,对收获指数的分析中有48份种质比SC8和有28份种质比SC205对不同年度环境适应性更好。AMMI模型很好地解释了木薯干物质率和收获指数的基因型G效应、环境E效应和G×E互作效应。该结果对木薯种质的环境敏感度和种植范围评估提供了依据。

The Analysis of Cassava Germplasms Genotype and Environment Interaction

In order to strengthen the study and utilization of the existing materials and the imported cassava breeding germplasm, and to accurately evaluate the stability and adaptability of characters relevant to yield performance, the genetic variance, environmental variance and genetic and environmental(G×E)interaction of 138 breeding materials and 8 Swiss varieties were discussed by the AMMI model in three successive year. The cassava cultivars(SC8 and SC205)were used as the control in this study. The results showed that:(1)The dry matter rate of 4 germplasms and the harvest index of 6 germplasms were higher and more stable than the control group SC8, respectively. The dry matter rate of 61 germplasms and the harvest index of 12 germplasms were higher and more stable than the control group SC205, respectively.(2)In dry matter rate study of cassava, there were 67 and 132 germplasms performed better in different annual environmental adaptability than SC8 and SC205, respectively. In the study of the harvest index of cassava, there were 48 and 28 germplasms performed better in different annual environmental adaptability than SC8 and SC205, respectively.