Abstract: Tremendous impact of drought on agricultural production,research drought stress on physiological and yield,will provide the basis for soybean production in arid areas.In this paper,the use of plastic storage box drought stress test were studied photosynthetic physiology,leaf osmotic adjustment and antioxidant enzyme composition and biomass yield on the soil water into arid(45%-55% of the maximum water holding capacity of soil field) two horizontal and humid(80%-100% field soil water holding capacity,CK).The results showed that drought stress soybean net photosynthetic rate,stomatal conductance and transpiration rate decreased significantly,water use efficiency increased;drought stress on leaf peroxidase(POD) and superoxide dismutase(SOD) no significant effect on the content;malondialdehyde(MDA) content increased by 25.00% to reach a significant level;the amount of reducing sugars and total soluble sugars increased by 47.09% and 47.16%,respectively.Drought stress on soybean plant height,node number,stem diameter,aboveground biomass,yield decreased significantly.Under drought stress,soybean stomatal conductance decreased significantly,severely affected the supply of CO₂,reducing the net photosynthetic rate,so that the decline in soybean photosynthetic metabolism.Plant material can be adjusted to maintain the moisture permeation through the cell.Although soybeans can maintain cell moisture through osmotic adjustment substances,drought still inhibits normal plant growth and decreases soybean biomass and yield.

Key words: Drought, Soybean, Photosynthesis, Antioxidant enzymes, Biomass, Yield

CLC Number: 

• S565.1