糜子育成品种苗期抗旱性评价与鉴定指标筛选

在年降雨量不足40 mm的敦煌市,对我国不同地区育成的56份糜子品种,采用反复干旱法进行了苗期抗旱性鉴定,利用反复干旱存活率和抗旱性综合评价值D的聚类结果筛选出一级抗旱品种4份,分别是陇糜5号、吉3、蒙粳糜1号和蒙粳糜7号;配对t测验显示:反复干旱胁迫后糜子苗高、植株含水量、单株叶面积、生物学产量分别降低了16.097 cm、0.393 g/株、10.358 cm2/株、0.075 g/株,差异达到了极显著水平,而根长、相对生长率反向增加了0.555 cm、3.213%;主成分分析中,植株含水量、生物学产量、单株叶面积3个指标在第1主成分中起决定作用(系数均≥0.881),且与两种抗旱评价参数值相关性均达到了极显著水平,因此,确定植株含水量、生物学产量、单株叶面积作为糜子苗期抗旱性鉴定1级指标。

Evaluation and identification indexes selection on the drought resistance of broomcorn millet bred cultivars at seeding stage

In DunHuang city of annual rainfall less than 40 mm, 56 Broomcorn millet bred cultivars from different regions in China and repeated drought method were chosen as experiment material and identification method at seeding stage. The study made use of survival rate after repeated drought and comprehensive evaluation valve D as drought evaluation methods, as well as applied cluster analysis and principal component analysis, correlation analysis as classification and the drought resistance index screening methods. Results show: 10 traits were occurred difference among 56 Broomcorn millet bred cultivars. Seedling plant height, plant water content, leaf area per plant, biomass have the greatest effect on repeated drought stress at broomcorn millet seedling, on the contrary, root length, relative growth rate have lesser affect. Longmi No.5, Mengjingmi No.1, Mengjingmi No.7, Ji No.3 were screened grade 1 drought-resistant varieties. Plant water content, biomass, leaf area per plant, relative growth rate can be used as dominating drought resistance identification of broomcorn millet seedling, and root number, root length, root-shoot ratio can be used as auxiliary indexes in drought-resistant identification of broomcorn millet seedling.