Change of the root protective enzyme activities and endogenous hormones of maize seedling under low-temperature stress
In order to reveal the protective enzyme activity, endogenous hormones in the seedling root and their relationships to low temperature stress, Zhengdan958(cold resistance type), Xianyu335(middle type), Fenghe1(sensitivity type) were investigated at diurnal temperature of 14 ℃/5 ℃, 16 ℃/7 ℃, 18 ℃/9℃, 20℃/11℃(CK)for 2, 4, 6, 8, 10 d, which analyzed the SOD and POD activities, MDA content and the change of ABA, IAA, GA. The results showed that SOD and POD activities were Zhengdan958>Xianyu335>Fenghe1, MDA content showed Fenghe1>Xianyu335>Zhengdan958. The results showed that with a prolonged stress under different temperature treatment, the activity of SOD, POD and the content of MDA in relative comparison were on the rise. The content of IAA changed insignificantly, the content of GA was decreased, which indicated that cold resistance type had higher ability to remove free radical and resulting to reduce the damage of membrane and keep plant metabolic. As low temperature inhibited the growth of root system, endogenous hormone adjustment could keep it grow normal y, which showed that resistant varieties had strong resist-ability to low temperature and ABA played a key role in relieving stress damage.
NETL
NSTL
万方数据
维普
