Chinese Journal of Agrometeorology ›› 2015, Vol. 36 ›› Issue (05): 602-611.doi: 10.3969/j.issn.1000-6362. 2015.05.010

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Effects of Drought Stress on Photosynthetic, Osmotic Adjustment Substance and Antioxidase Activities of Winter Wheat Level

HU Cheng-da, LIU Rong-hua, WANG Xiu-ping, LIU Zhong-yang, LI Tong-xiao   

  1. Henan Institute of Meteorological Sciences/Henan Key Laboratory of Agro-meteorological Support and Applied Technique, CMA, Zhengzhou 450003, China
  • Received:2015-02-28 Online:2015-10-20 Published:2015-10-19

Abstract: Sufficient water supply (CK, soil relative water content, SRWC, 80%) with two drought stress treatments (T1, SRWC 40% and T2, SRWC 60%) was set under field conditions by using large moving waterproof canopy. The effects of drought stress on photosynthetic physiology, osmotic adjustment substance content, membrane lipid peroxidation, and the activities of antioxidase were investigated. The result showed that gas exchange parameters and chlorophyll contents dramatically decreased after a slightly increased along with winter wheat development stage of T1 treatment. Then the protection mechanism of winter wheat was booted as the content of soluble sugar and malondialdehyde kept increasing under T1 treatment, and the content of soluble protein, free proline content, and the activity of superoxide dismutase(SOD), catalase(CAT) and peroxidase(POD) decreased after a first rose under T1 treatment. The performances of T2 treatment were similar to T1 with a more slight variation. The results indicated that although by increased osmotic adjustment substance content could mitigate water loss under different water deficit conditions. Water still can’t meet wheat’s demand at the late growth stage. The increasing of antioxidase activities could quench more reactive oxygen but the reactive oxygen still increased, which lead membrane lipid peroxidation and membrane permeability increased. The chlorophyll degraded, photosynthesis rate decreased and the leaf senescence aggravated.

Key words: Net photosynthesis rate, Stomatal conductance, Soluble sugar, Soluble protein, Malondialdehyde