Effects of soil moisture on leaf protective enzyme activities and yield of spring wheat cultivars with different drought resistance
[Objective]To study the effects of soil moisture on the yield of protective enzyme active agent in different drought-resistant varieties in the hope of providing theoretical basis for the breeding of drought-resistant spring wheat varieties.[Methods]Under field conditions,Xinchun 46 with strong drought resist-ance,Xinchun 37 with medium drought resistance and Xinchun 26 with weak drought resistance were used as experimental materials to study the effects of soil moisture on SOD,POD,CAT activities,MDA content and yield of flag leaves of spring wheat varieties with different drought resistance.[Results]With the increase of water deficit,the activities of SOD and CAT in flag leaves of wheat increased at flowering stage,and first in-creased and then decreased at filling stage.POD activity increased at flowering stage and then decreased,and increased at grout stage.MDA content showed an increasing trend.The SOD and POD activity of drought-re-sistant cultivar Xinchun 46>drought-resistant medium cultivar Xinchun 37>drought-resistant weak cul-tivar Xinchun 26 showed an opposite trend among varieties.The harvest panicle number,grain number per ear and yield decreased with the increase of water deficit.The harvest panicle number and grain number per ear of Xinchun 46 with strong drought resistance decreased less than those of Xinchun 37 and Xinchun 26 under lim-ited irrigation and deficit irrigation,and the yield of Xinchun 46 under water deficit was higher than those of the other two varieties.[Conclusion]Under the condition of limited irrigation and deficit irrigation,the flag leaves of Xinchun 46 with strong drought resistance had higher SOD and POD enzyme activities,lower MDA content,and stronger active oxygen scavenging ability,which effectively delayed the senility of wheat plants.Compared with the cultivars with moderate drought resistance and weak drought resistance,the number of harvested ears and grain per ear decreased less,which was conducive to higher yield under the condition of water deficit.
spring wheatsoil moisturedrought-resistant varietiesprotective activityyield
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