| In order to study the response of root and shoot of winter wheat to changeable water in different growth stages,the experiment was conducted by pot cultivation under greenhouse, with well-watered treatment,mild and severe stress treatment in full growth stage,and mild and severe stress treatment from tilling stage to spiking stage or tassel stage,respectively.The results showed that root and shoot of winter wheat had different response to changeable water.The relative growth rate of root to shoot was decreased under different degree and time of stress;the proportion of root weight to total weight was increased,while that of shoot weight was decreased.With stress extending,the growth period of winter wheat was shorten;under severe stress or extending mild stress,the maximum of root was reduced,but its sustaining time was prolonged.After rewatering,in spite of increasing growth of root and shoot,the proportion of root weight under mild stress was less than that under severe stress,and the proportion of root weight under short-time stress was less than that under long-time stress.The phenomena could be regarded as lag-time effect.The effect of root and shoot to water indicates that winter wheat adopt to surrounding stress through self-adjustment,namely,by increasing root weight or decreasing root loss,and improving water-absorbing function to finish shoot growth in reproductive stage. |