Abstract:

Abstract：The experiment of both low temperature and high humidity on the two different types of Bt cotton cultivars was conducted at different developing periods, the results showed that the low temperature at both 18 ℃ and high humidity (90%-95%RH) for 48 hours resulted in leaf Bt protein content decrease in three periods, especially in the peak boll period. The leaf GPT activity, the contents of leaf amino acid and soluble protein decreased during peak boll period under the both low temperature and high humidity treatment. It had characteristics of weak N metabolism intensity.