孕穗期高温与涝对水稻光合特性和产量的影响

目的]探究孕穗期高温与涝胁迫对水稻光合特性和产量的影响.方法]采用盆栽试验,设置3个胁迫处理,分别为涝胁迫(T1,15cm),高温胁迫(T2),高温x涝胁迫(T3,15cm),以浅水勤灌为对照(CK),分析了孕穗期高温与涝胁迫条件下水稻光合特性和产量变化.结果]孕穗期胁迫结束后,T2处理相比CK降低了水稻的光合速...

The Effects of Thermal and Waterlogging Stresses at Booting Stage on Photosynthesis and Yield of Rice

【Objective】Crops often endure various biotic and abiotic stresses during their growth.This paper investigates how thermal and waterlogging stresses occurring at booting stage affect photosynthesis and the ultimate yield of paddy field rice.【Method】The experiments were conducted in pots and consisted of four treatments:waterlogging stress by keeping the water on the soil surface 15 cm deep(T1),higher them stress(T2),high thermal stress combined with the waterlogging stress(T3).Conventional irrigation with water on the soil surface kept at 0~5 cm deep was taken as the control(CK).In each treatment,we measured the change in SPAD,photosynthetic traits and yield of the rice.【Result】Compared to CK,T2 reduced the photosynthetic rate by 30.77%,while T3 increased SPAD,photosynthetic rate and stomatal conductance of the leaves by up to 51.90%.Compared to CK,the impact of the stresses occurring at booting stage on shoot growth lasted into mature stage.It hence reduced the yield,especially T2 and T3 which reduced the rice yield by 80.09%and 12.33%,and 1000-grain weight by 16.31%and 11.86%respectively.【Conclusion】To alleviate the adverse impact of thermal stress at the booting stage on yield,water in the soil surface should be kept about 15 cm deep to ameliorate the potential thermal damage.