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Responses of cotton growth and water physiological indices to salt stress at different growing stages.

FENG Di1, ZHANG Jun-peng1, SUN Chi-tao1, DANG Hong-kai2, LIU Hao1, NING Hui-feng1, SUN Jing-sheng1**, LI Ke-jiang2   

  1. (1Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences/Key Laboratory for Crop Water Requirement and Regulation of the Ministry of Agriculture, Xinxiang 453002, Henan, China; 2Institute of Dryland Farming, Hebei Academy of Agriculture and Forestry Sciences, Hengshui 053000, Hennan, China)
  • Online:2014-05-10 Published:2014-05-10

Abstract:

In order to explore the water regulation mechanism of cotton under salt stress at different growing stages, a potted experiment was conducted to study the shortterm responses of cotton (Jimian 616) growth and water physiological indices to various salinities of irrigation water (NaCl) at different growing stages. The results indicated that when the salinity of irrigation water reached 4 g·L-1, cotton vegetative growth was restrained; however, the reproductive indices (bud stage and blossoming and bollforming stage) were not affected significantly. The growing process was not affected at the bud stage, delayed at emergence and seedling stages but advanced at blossoming and bollforming stages. In addition, with the increase of irrigation water salinity, stomatal resistance increased at the seedling stage, bud stage, and blossoming and bollforming stage. However, the relative leaf chlorophyll content increased at the seedling stage, first increased and then decreased at the bud stage, decreased at blossoming and bollforming stages, respectively. Salt stress increased the dry weight to fresh weight ratio of all organs except leaves during the whole study period, and the dry weight to fresh weight ratio of leaves basically kept stable. Our results suggest that water in cotton plant could be supplied to leaves preferentially and leaf transpiration was reduced through a water regulation mechanism when cotton was in salt stress.
 

Key words: sewage, metabolite, maize seedling, cadmium, combined stress