| In order to screen new barley varieties with drought resistance and drought resistance indices at adult stage,a total of 100 barley germplasms were planted in Dunhuang Experimental Station of Gansu Province for two consecutive years with precipitation less than 40 mm during barley growing period. Two treatments of normal irrigation and drought stress were set up in the experiment. The plant height(PH), spike length(SL), grain number per spike(GNS), tiller number(TN), effective tiller(ET), individual biomass(IB),1 000 grain weight(TGW) and yield(Y) of barley materials were determined. The drought resistance comprehensive evaluation value(D), comprehensive drought resistance coefficient(CDC), weight drought resistance coefficient(WDC), correlation analysis, frequency analysis and the correlation analysis were used,and principal component analysis, grey correlation analysis, membership function analysis, cluster analysis and stepwise regression analysis were performed to identify drought resistance of barley germplasm and screen drought resistance indices. The results showed that drought stress had significant effects on plant height, spike length, individual biomass, tiller number, effective tiller, grain number per spike, 1 000-grain weight and yield. Based on the analysis of the comprehensive evaluation index of drought resistance of barley at adult stage, it was concluded that the combination of D value and WDC value can accurately evaluate the drought resistance of barley at maturity stage, and the individual biomass, grain number per spike, tiller number,effective tiller and plant height can be used as the characters to evaluate the drought resistance of barley germplasm at adult stage. Finally, the germplasm with strong drought resistance at adult stage were comprehensively screened out, including S-130, Bnoc168, LL-53,Ziyuan 160-Zaoshu 3, IL-18, Z16, Zhanyihongmaodamai and Ziyuan 21-6B98-9339. |
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