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Two upland rice varieties(IRAT109,IAPAR9)and one lowland rice variety(Zhenshan 97B)were planted in summer andtreated with both normal(full water)and drought stress in the reproductive stage.Panicle water potential(PWP)and leafwater potential(LWP)were measured every 1.0-1.5h over 24h on sunny days.Both PWP and LWP of upland varietiesstarted to decrease later,maintained a higher level and recovered more quickly than that of the lowland variety.Theresults show that PWP can be used as an indicator of plant water status based on the parallel daily changes,and the highcorrelation between PWP and LWP.Similar correlations were also observed between PWP,LWP and eight traits relatedto plant growth and grain yield formation.PWP seemed to be more effective for distinguishing the upland rice varietieswith different drought-tolerant ability.Differences in PWP and LWP between upland and lowland rice varieties were alsoobserved at noon even under normal water conditions,implying the incorporation of the drought-tolerant mechanism toimprove the photosynthesis and yield of traditional paddy rice.
Two upland rice varieties (IRAT109, IAPAR9) and one lowland rice variety (Zhenshan 97B) were planted in summer and both with normal (full water) and drought stress in the reproductive stage. Panicle water potential (PWP) and leafwater potential (LWP) were measured every 1.0-1.5h over 24h on sunny days ..Both PWP and LWP of upland varietiesstarted to decrease later, maintained a higher level and recovered more quickly than that of the lowland variety.Theresults show that PWP can be used as an indicator of plant water status based on the parallel daily changes, and the high correlation between PWP and LWP. similar correlations were observed between PWP, LWP and eight traits relatedto plant growth and grain yield formation. PWW was found to be more effective for distinguishing the upland rice varietieswith different drought-tolerant ability. Differences in PWP and LWP between upland and lowland rice varieties were alsoobserved at noon even under normal water conditions, implying the incorporation of t he drought-tolerant mechanism toimprove the photosynthesis and yield of traditional paddy rice.