20份山西糜子种质资源抗旱性综合评价

为了明确山西省生产上应用的糜子品种抗旱性，对全生育期进行抗旱鉴定，测定不同处理下糜子的株高、穗长、茎粗、穗重、穗粒重、株草重、主茎节数、千粒重、有效穗9个性状。采用主成分分析和逐步回归分析法进行全生育期抗旱综合评价并筛选抗旱指标。结果表明：9个表型性状间存在着一定相关性；穗重和株草重2个指标在正常供水与干旱胁迫处理下变异系数减小最大；农家种黄糜子抗旱性最强(D=0.87)，综合抗旱D值与产量隶属函数值存在显著相关(r=0.5159，P<0.05)；穗重和株草重对抗旱性影响显著，可作为生育期抗旱性鉴定综合指标。

Comprehensive Assessment of Drought Resistance of 20 Proso Millet Germplasm Resourcesin Whole Growth Period

In order to clarify drought resistance of proso millet applied in field production in Shanxi, we identified its drought resistance during the whole growth period and measured nine traits, including plant height, panicle length, stem diameter, panicle weight, grain weight per spike, straw weight per plant, node numbers of main stem, 1000-grain weight and effective panicles, under different treatments. Principal component analysis and stepwise regression analysis were used for comprehensive evaluation of drought resistance during the whole growth period and screening the drought index. The results showed that there were correlations among 9 phenotypic traits. The coefficient of variation of panicle weight and straw weight per plant sharply reduced under normal water supply and drought stress. Landrace‘yellow millet’had the strongest drought resistance (D=0.87), integrated drought D value and membership function value of yield had significant correlation (r=0.5159, P<0.05). Panicle weight and straw weight per plant had significant impact on drought resistance and could be taken as comprehensive indexes of drought resistance identification in growth period.