甘芥种间杂交后代DH系花期抗旱性评价

摘要

In this study,22 doubled haploid (DH) lines from interspecific hybrid of B.napus and B.juncea were planted under both conditions of drought stress and normal irrigation at flowering stage in 2013 and 2015,during which the rainfall was 5.7 mm and 6.7 mm.The yield and yield-related agronomic traits were observed,and the drought-resistance of different lines was evaluated by adopting drought resistance index method,gray relevancy method and cluster analysis.The results showed that the drought resistance of most interspecific hybrids was stronger than that of convemional B.napus cultivars,and 7 strong drought-resistant materials were screened.No matter the direct evaluation method or the comprehensive method of correlation coefficient was adopted,the classification consistent rate of drought-resistance level was about 42.55 ％ under two different conditions of drought stress.The drought resistance of same materials was inconsistent under different conditions of drought stress.Therefore,it is more reliable to evaluate the drought resistance of crops with comprehensive evaluation method under various extents of drought stress.%本试验以22份甘蓝型油菜和芥菜型油菜种间杂交后代DH株系为供试材料,在油菜花期降雨量约5.7mm、6.7mm的情况下,连续两年设置正常灌水、花期干旱胁迫2个处理,考察产量及与产量相关农艺性状,应用抗旱指数法、灰色关联度综合分析法结合聚类分析,筛选优异的抗旱种质资源.结果表明,多数甘芥杂交后代材料抗旱性高于常规甘蓝型品种,共获得7份抗旱性较强的材料;无论采用直接评价或关联系数综合评价,两种不同程度的干旱胁迫条件下,约有42.55％的材料抗旱等级分类一致,同一材料在不同程度干旱胁迫条件下,其抗旱性表现有差别,通过不同程度干旱胁迫条件下综合评价其抗旱性结果更可靠.