Effects of Carboxymethyl Chitosan on Seed Germination and Seedling Physiological Characteristics of Brassica chinensis Under Suboptimal Temperature

The effect of different concentrations of carboxymethyl chitosan(0,0.5,1.0,2.0 and 4.0 mg/mL) on Brassica chinensis seed germination and plantlet physiological characteristics at suboptimal temperature(15±1℃) was studied.The results showed that the optimum concentration of carboxymethyl chitosan was 1.0 mg/mL.Seed germination rate,germination energy and germination indices increased by 30.58%,18.04% and 47.58% individually compared to the check one.Seedling height increased by 30.41%,seedling fresh weight by 30.00%,root length by 15.04%,root fresh weight by 50.00%,content of soluble sugar by 63.42%,content of soluble protein by 63.19% and free amino acid by 22.48%.