Effects of Drought Stress during Grain Filling Period on Physiological and Root Characteristics of Different Wheat Cultivars
In order to study the effects of drought stress during grain filling period on physiological and root characteristics among different wheat cultivars,the new variety Zhengmai 1860 with high yield and high resistance,Bainong 207 and Zhoumai 18 were selected as experimental materials.The results showed the net photosynthetic rate(Pn)of Zhengmai 1860 was significantly higher than that of Zhoumai 18,the activities of superoxide dismutase(SOD),catalase(CAT)and peroxidase(POD)in Zhengmai 1860 and Bainong 207 increased under drought stress,meanwhile,Zhengmai 1860 had higher ratio of root to shoot,the number of root tips and root surface.Compared with Bainong 207 and Zhoumai 18,the malonaldehyde(MDA)content of Zhengmai 1860 was less than that of the control group after rehydration.The results also showed that Zhengmai 1860 could maintain a high Pn and stabilize grain yield under drought stress at grain filling stage.By increasing activities of SOD,CAT and POD,it accelerated the regeneration of glutathione and promoted the increase of reduced glutathione/oxidized glutathione to slow down the membrane lipid peroxidation damage.Furthermore,Zhengmai 1860 has stronger water absorption capacity,greater ability to remove excess reactive oxygen species under drought stress,thus reducing the damage of membrane structure caused by drought stress.
Triticum aestivum L.Drought stressRootProtective enzymeRegulation of gene expression
NETL
NSTL
万方数据
