| In order to identify the drought resistance of three new wheat cultivars Xinong 538,Xinong 556 and Xinong 558,three wheat cultivars Jinmai 47,Xiaoyan 22 and Xinong 979 with different drought resistance were taken as controls.The experiment was conducted under natural drought stress and manual irrigation for six wheat cultivars,the physiological (SOD,POD,CAT,MDA,proline content,etc.) and agronomic indexes (plant height,spikelet number,kernels per spike,internode length,etc.) were investigated.The comprehensive evaluation for wheat drought resistance was conducted with correlation analysis,principal component analysis and subordinate function analysis.The results indicated that,there existed different degrees of correlation between different indices,and each index had different effects on the drought resistance of the varieties.Through principal component analysis,nine physiological indices and plant height were transformed to three independent and synthesized indices (heading stage,filling stage and grain jointing stage),and nine agronomic characters indices were transformed to two independent and synthesized indices (mature stage),and the accumulative contribution rate of which were 93.67%,87.16%,92.29% and 89.56%,respectively for four stages.Based on the synthetic evaluation value (D),the six wheat cultivars were divided into three groups,Xinong 538 and Jinmai 47 belonged to the high drought resistance group.Xinong 558 and Xiaoyan 22 belonged to the medium drought resistance group.Xinong 556 and Xinong 979 belonged to the low drought resistance group. |
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