Effects of PEG Stress and Recovery on Photosynthetic Characteristics of Spring Wheat Seedlings

Photosynthesis is an important way that the plants produce organic matter, drought stress is one of the main environment factor inhibiting photosynthesis. In order to study the photosynthetic characteristics of PEG stress and recovery of spring wheat seedlings, 'Abbondanza' that drought varieties and 'Qingchun 38' that water varieties were selected and planted in plant growth chamber under PEG-6000 stress and recovery to study the net photosynthetic rate, transpiration rate and relative chlorophyll content. The results indicated that the net photosynthetic rate, transpiration rate and relative chlorophyll content under -0.5 MPa PEG-6000 were a little higher than those of the contrasts and decreased little by little under -1.0 MPa and -1.5 MPa PEG-6000 with the stress degree stronger and the stress time longer in two cultivars, however,they began to raise again after recovery.'Abbondanza' has more strong ability of photosynthesis and stronger drought resistance than 'Qingchun 38' during seedlings.