Effect of Upper Root-zone Water Stress on Growth and Development of Maize Roots and Above-ground Part
With Zhengdan 958 as the experimental material,the nutrient solution incubation method was used to study the effect of water stress for upper root system on the growth and development of maize roots and above ground organs.The results showed that the continuous or periodic water stress on upper root system could obviously promote the growth of roots in lower root zone and enhance their capability.For root dry weight,primary root length,secondary root length and root activity,W1 (The upper root system was exposed in the air,simulating water stress)＞W2 (The upper root system was exposed in the air and then immersed in the nutrient solution for a circle,simulating dry-wet alternation)＞CK(The upper root system was immersed in the nutrient solution,simulating normal water supply) among different treatments,of which the treatment W1 increased by 120.6％,76.1％,35.8％ and 13.6％ (compared to CK) respectively,and the treatment W2 by 47.4％,32.9％,14.2％ and 8.1％ respectively.But for dry weight of above-ground part and the whole plant,W1＜W2＜CK among different treatments,of which the treatment W1 reduced by 33.9％ and 21.9％ than CK,and W2 reduced by 19.1％ and 13.9％,respectively.The result suggested that the water tress on upper root system could induce the compensation effect of roots in lower root zone of maize,so the root grew vigorously.However,in view of the whole coordination of maize growth and development,the periodic drying-wetting alternation on upper root system could coordinate the contradiction of root system and above-ground part,distribute and utilize effectively the limited dry matter,and induce the super compensation effect.
国家科技期刊平台
NSTL
万方数据
维普
