玉米杂交种苗期抗旱性鉴定与评价

目的]确定玉米杂交种苗期抗旱性的鉴定指标,进一步筛选出苗期抗旱性强的玉米品种。方法]以河北省主推和新审定的20个玉米杂交种为材料,通过苗期沙培试验,测量苗期根条数、根长、根表面积、根系平均直径、根体积、总生物量、鲜重根冠比、干重根冠比8个根系性状。结果]干旱胁迫对苗期8个根系性状均产生了不同程度的影响。根长、根表面积和干重根冠比在不同品种间和不同处理间均表现显著差异,可作为抗旱指标。综合3个抗旱指标的分类结果,认为农单08-5为强抗旱品种,伟科702和郑单958为中度抗旱品种,先玉335为弱抗旱品种。结论]该研究筛选出苗期抗旱性玉米品种,为玉米的高产栽培提供理论依据。

Identification and Evaluation on Drought Resistance of Maize Hybrids in Seedling Stage

Objective] Identification indexes of drought resistance of maize hybrid seedlings were determined, and maize varieties with drought resistance were selected.Method] The experience was based on 20 varieties of maize applied in production or approved new varieties in Hebei,we used sand culture experiment and measured the number of root,root length,root surface area,roots average diameter,root vol-ume,total biomass,root to shoot fresh weight ratio,root to shoot dry weight ratio at the seedling stage.Result]Drought stress had different effects on eight roots traits of seedling stage. Root length,root surface area and root to shoot dry weight ratio which showed significant differ-ences among different varieties and different treatments could be used as drought resistance index. Comprehensive classification results based on 3 drought resistance index showed that Nongdan 08-5 was a strong drought-resistant variety, Weike702 and Zhengdan 958 were moderate drought-resistant varieties,Xianyu335 was weak drought-resistant varieties.Conclusion]The study screened out drought resistant maize varie-ties at seedling stage,and provided theoretical basis for high yield cultivation of maize.