玉米自交系苗期耐旱性鉴定

Evaluation for Seedling Drought Resistance of Different Maize Inbred Lines

[目的]对玉米自交系苗期耐旱性进行鉴定。[方法]利用浓度为15%的聚乙二醇高渗溶液浇灌模拟干旱胁迫环境。以43份玉米骨干自交系为试验材料,测定了9个与根系有关的形态学指标,通过差异显著性分析,进行了不同玉米自交系苗期耐旱性的鉴定。[结果]以鲜重根冠比、根系鲜重和根系干重这3项作为玉米苗期耐旱性鉴定指标,并利用耐旱系数将参试材料分成不同的耐旱等级,在3种鉴定指标下抗旱级别完全一致的材料有8份,其中丹599为极强抗旱类型,陕89为强抗旱类型,B97、DF32、A679和丹9046为中度抗旱类型,D20和苏75为极弱抗旱类型。[结论]该试验为苗期玉米耐旱种质筛选和改良提供了有效指导和借鉴。

[ Objective] To evaluate the seedling drought resistance of different maize inbred lines. [ Method] 15% polyethylene glycol was used to simulate drought stress conditions. With 43 backbone inbred lines of corn as the test materials,9 morphological indicators related to the root sys-tem were measured. According to the analysis of the difference of significance, seedling drought resistance of different inbred lines of maize was e-valuated. [ Result] With the fresh weight root-top ratio,root fresh weight and root dry weight as the indicators for maize seedling drought resistance identification, the selected materials were divided into different drought grades by using the coefficient of drought resistance. Under the three kinds of appraisal indicators,drought levels of 8 maize inbred lines were fully consistent. Among them,Dan 599 was quite strong drought resistance type and Shan 89 was strong drought resistance type ; B97, DF32, A679 and Dan 9046 were moderate drought resistance type, Sue 75 and D20 were quite weak drought resistance type. [Conclusion] This research provided beneficial guidance and reference for seedling drought-tolerant maize germplasm screening and improvement.