[Objective]Grain filling is the final growth stage in cereals when fertilized ovaries develop into *** filling degree and rate of rice（Oryza sativa L.） spikelets differ largely with their positions on a *** filling ...
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[Objective]Grain filling is the final growth stage in cereals when fertilized ovaries develop into *** filling degree and rate of rice（Oryza sativa L.） spikelets differ largely with their positions on a *** filling is generally believed to be a regulated process either genetically or *** or drought stress is one of the most important factors limiting crop yields *** mechanism underlying the decrease or increase in grain filling under soil-drying is yet to be well *** acid（ABA） and ethylene are two major phytohormones generally suggested to be involved in linking plant responses to *** has been reported that many adversities could induce membrane damage,membrane lipid permeability increase,and biological free radicals accumulation,such as malondialdehyde（MDA）.Moreover,drought,like other abiotic stresses,results in oxidative stress through an increase in reactive oxygen species（ROS）,such as superoxide radical(O).To clear these ROS,plants have developed a complex antioxidative enzymes system（AES）,including catalase（CAT）,peroxidase（POD）,and superoxide dismutase（SOD）.Although the AES and ROS in rice under water stress are well documented,little is known about relationships of ABA,ethylene,AES,and ROS with grain filling of superior and inferior spikelets of rice under different soil water *** study tested the hypothesis that abscisic acid（ABA） and ethylene may mediate the effect of postanthesis soil-drying on grain filling of rice through regulating antioxidative systems;[Method]The experiment was conducted at a farm belonging to Yangzhou University,Yangzhou,China during the rice growing season（May to October）.Two rice cultivars,Wuyunjing 8（japonica） and Yangdao 6（indica）,were *** 9 DPA until maturity,three levels of soil water(Ψ) potentials were imposed by controlling water *** well-watered（WW）treatment was flooded with 1-2 cm water depth in the pot(Ψ^i = 0 kPa) by man
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