Journal of Arid Meteorology
ZHANG Jian 1, ZHANG Ming 1, HOU Yunpeng1, WANG Huirong1, ZHAO Funian 2
In order to study the effect of drought stress on physiological characteristics and irrigation water use efficiency during growth and development period, the high-yielding, high-quality and drought-resistant new varieties of spring wheat named ‘Dingfeng 18’ and ‘Dingfeng 19’were used as materials. Well watered (WW), moderate soil drought (MD) and severe soil drought (SD) from the tillering stage to maturity stage were treated to study their effects on wheat leaf water potential, photosynthetic rate, grain filling rate, yield components and irrigation water use efficiency. The results show that compared with WW treatment, the leaf water potential significantly reduced (p<0.05) under MD and SD treatment, and it reached normal level through night recovery under MD treatment, but it could not restore under SD treatment. The photosynthesis of leaves was significantly inhibited under SD treatment, there was no significant difference in photosynthesis of leaves between MD and WW treatments (p>0.05). Compared with WW treatment grain filling rate, grain weight, grain number, 1000-grain weight and yield significantly increased under MD treatment and significantly decreased under SD treatment. There was no significant difference in the bulk weight between different treatments (p>0.05). Two years experiments results of the two different varieties were basically consistent. Moderate water deficit was beneficial to increase wheat yield, thus improving irrigation water use efficiency.
Key words: spring wheat,
irrigation water use efficiency
ZHANG Jian, ZHANG Ming, HOU Yunpeng, WANG Huirong, ZHAO Funian. Effects of Drought Stress on Phys