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Physiological and Biochemical Responses of Non-hydraulic Root-sourced Signal Threshold Range of Soybean at Anthesis

Author: YangZuoZuo
Tutor: LiFengMin
School: Lanzhou University
Course: Ecology
Keywords: soybean water stress nHRS HRS Threshold range chlorophyll fluorescence MDA ROS protectiveenzyme MRGY WUE
CLC: S565.1
Type: Master's thesis
Year: 2009
Downloads: 8
Quote: 0
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Abstract


Two kinds of soybean were selected as the experimental materials.The endeavor was aimed at providing a theoretical basis for choosing drought-resistance cultivar and developing water saving agriculture in soybean cultivation by studying the effects of drought stress on chlorophyll fluorescence characters,physiological-biochemical index,drought tolerance and yield variation in response to non-hydraulic root-sourced signal threshold range of soybean at anthesis.Main results were derived as:1.Soil water deficit would lead to conspicuously different reaction of non-hydraulic root-sourced signals(HRS' dissertation">nHRS) and hydraulic root-sourced signals(HRS) in different soybean at anthesis.The threshold range of nHRS was from -0.38 to -0.73MPa SWP for modern cultivar A(Longdou No.2) and -0.41 to -0.69MPa SWP for landrace cultivar B(Yuzhong Soybean).Cultivar A which presented of high upper limit and low lower limit had wider threshold range of nHRS than cultivar B.2.Under water deficit of soybean at anthesis,the coefficient of variable to minimal fluorescencet(Fv/Fo),the coefficient of variable to maximum fluorescence(Fv/Fm) and the photochemical quenching coefficient(qP) decreased;the decrease was insignificant under nHRS compared to the control(CK),but significant decrease was observed under HRS.Cultivar A which has wide threshold range decreased less than cultivar B.The non-photochemical quenching coefficient(NPQ) of cultivar A increased more than that in cultivar B.NPQ increased significantly(P＜0.05) under nHRS compared to CK and increased significantly(P＜0.01) under HRS.Analysis indicated that photosystemⅡdamaged;and potential activities of PSⅡdecreased; primary light energy conversion of PSⅡdecreased;photosynthetic electron transported;photosythetic O reaction inhibited and heat disseminate which possess photoprotective effect increased under HRS. 3.The results of the physiological-biochemical index showed that reactive oxygen species(ROS),protectiveenzyme activity and membranes peroxidation index increased little under nHRS compared to the control.The results indicated that cell membranes were not damaged by ROS.ROS and protectiveenzyme activity increased significantly under HRS.ROS increased more than protectiveenzyme activity,while membranes peroxidation index increased significantly indicating that plant drought resistance system was beginning to be damaged at the moment.Moreover,MDA and protectiveenzyme activity of cultivar B was higher than those of cultivar A.While ROS of cultivar A was lower.The result suggested that the modern cultivar A has more powerful drought resistance ability.4.Drought lethal experiment showed that cultivar A survived more days and died later than cultivar B.So the drought tolerance of cultivar A was stronger than cultivar B.5.The maintenance rate of grain yield(MRGY) and the water use efficiency(WUE) of cultivar A were significantly higher than those of cultivar B under moderate drought treatment.While drought susceptibility index(DSI) of cultivar A was significantly lower.The result showed that with wide threshold range of nHRS,the MRGY and WUE were improved under moderate drought treatment condition,while DSI was reduced.Obviously,the threshold range of nHRS of soybean was positively correlated with MRGY and was negatively correlated with DSI.

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CLC: > Agricultural Sciences > Crop > Economic crops > Oil crops > Soybean
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