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通过对 37份我国主要玉米自交系两年的开花期耐旱性鉴定 ,筛选出耐旱系 12份 (K2 2、SH15、X178、P138、中自 0 1、中自 4 5 1、金黄 96 B、齐 319、旱 2 3、东 91、临京 11、CA15 6 )。在干旱胁迫下 ,果穗吐丝延迟 ,雌雄开花间隔增大 ,结穗率下降 ,籽粒产量严重降低 ;雌雄开花间隔天数和结穗率与籽粒产量均呈极显著相关 ,是可供耐旱性选择利用的指示性状。用 SSR标记研究了 38份自交系的遗传多样性。 4 7对 SSR引物共检测出 15 6个等位基因变异 ,将供试自交系划为 6个类群。 9份耐旱系分散于 4个类群 (B、C、E、F) ,其中 E群被鉴定为耐旱种质群。本研究结果为开花期玉米耐旱种质改良提供了重要信息
Through the identification of drought resistance of 37 major maize inbred lines at flowering stage in China for two years, 12 drought-tolerant lines (K2 2, SH15, X178, P138, Zhongyi 0 1, Zhongyi 4 5 1, Jin 96 B, Qi 319, drought 2 3, East 91, Lin Jing 11, CA15 6). Under drought stress, earring silking delayed, the interval between male and female increased, the rate of node panicle decreased, and the grain yield decreased seriously. The number of days between anthesis and anthesis and grain yield were significantly correlated with grain yield, Indicate traits used. The genetic diversity of 38 inbred lines was studied using SSR markers. A total of 15 SSR markers were detected in 47 pairs of SSR primers. The tested inbred lines were divided into 6 groups. Nine drought-resistant lines were dispersed in four groups (B, C, E, F), of which E group was identified as drought tolerant germplasm. The results of this study provide important information for the improvement of drought-tolerant germplasm in flowering stage