Effects of Drought Stress in the Whole Period on Cotton Morphology, Physiology,Photosynthesis and Yield

doi:10.7668/hbnxb.2017.05.033

Abstract

Abstract: In order to study the effects of continuous drought treatment in whole growth period on cotton growing development and final yield,in this experiment,pot-culture method was taken and Xinluzao 19hao,Xinluzao 27hao and Xinluzao 54hao as materials,the treatments were light and moderate drought stress,then measured morphological indexes,physiological indexes and photosynthetic parameters at seedling stage,bud stage,blooming stage and boll opening stage,and investigated yield components at harvest time.Results showed:cotton height and stem diameter decreased with the strengthen of drought stress; The content of reactive oxygen species and antioxidant enzyme activities were great difference at different growth stage,correlation analysis showed that there were significant or extremely significant correlation between active oxygen content and antioxidant enzyme activity,indicted that antioxidant enzymes activity changed regularly with the content of reactive oxygen species,so as to eliminate the excessive oxygen species in vivo and prevent the damage of reactive oxygen species; The photosynthesis of cotton at bud stage decreased with the strengthen of drought stress,but increased at boll opening stage,except Xinluzao 27hao which possibly due to persistent drought treatment caused the different developmental stage of cotton at later growth stage; Drought stress reduced the yield per plant and fiber length of Xinluzao 27hao and Xinluzao 54hao,light drought stress had little effect on single boll weight,even played a role in promoting; There were four indexes of cotton at blooming stage had significant correlation with yield per plant,indicted that cotton blooming stage might be the key period which easy to be affected by environment and determined the final yield.

Key words: Cotton, Drought stress, Physiology, Photosynthesis, Yield

CLC Number:

TIAN Yousheng, FAN Shuli, PANG Chaoyou, SUN Guoqing, ZHANG Guoli, YE Chunxiu, YU Hang, MA Panpan, MIAO Lingjuan, XIE Zongming. Effects of Drought Stress in the Whole Period on Cotton Morphology, Physiology,Photosynthesis and Yield[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2017, 32(5): 224-231. doi: 10.7668/hbnxb.2017.05.033.

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