Screening of Wheat Varieties Tolerant to Waterlogging at Bud-seedling Stage

CAI Bowei; TIAN Wentao; WANG Xiaoling?

doi:10.15933/j.cnki.1004-3268.2015.04.012

Abstract：This research was carried out to explore the relatively simple and rapid screening method of wheat varieties tolerant to waterlogging at bud-seedling stage. 155 varieties or advanced lines collected from different wheat-planting areas were used as experiment materials,and the artificial simulation water-logging treatment was conducted,taking normal water condition as control. The germination rate,plant weight and root weight of wheat varieties were measured,and their waterlogging indexes and waterlogging tolerance were calculated and analyzed. The results showed that, when the decrease percentage point (DPP) of germination rate in some varieties was zero,plant waterlogging index(PWI) was used as the judging indictor of waterlogging tolerance,and the varieties with PWI below 10. 0 was taken as the strong waterlogging tolerant varieties. For the varieties with DPP value of 0—40 percentage points after waterlog-ging,the drop of germination rate(DG) had significant relations with root waterlogging index(RWI) at bud-seedling stage,and the varieties with DG below 6. 0% and RWI below 10. 0 showed strong waterlog-ging tolerance,so DG≤6. 0% was the optimal indictor of strong tolerance under waterlogging. DPP value above 40 percentage points after waterlogging was the indictor of serious damage for wheat in bud-seedling period. There were 17 genotypes(Zhengmai 9023,Ningmai 17,Xiangmai 55,etc. ) with DPP value of zero and PWI below 10. 0,and 11 genotypes(Zhenmai 5,Jinmai 91,Zhengmai 2956,etc. ) with DG less than 6. 0% and RWI under 10. 0,which all showed strong waterlogging tolerance at bud-seedling stage in the experiment. Four wheat varieties(Pumai 9,Xinong 957,CP93-10-3-2 and Zhengmai 7698) showed the weakest waterlogging tolerance in bud-seedling period.