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• W2777809097 endingPage "11" @default.
• W2777809097 startingPage "1" @default.
• W2777809097 abstract "Heat stress (HS) combined with water stress (WS) negatively impact soybean [Glycine max (L.) Merr.] production. The aims of this research were to quantify the combined effect of HS and WS during grain filling (GF) on grain yield, and to identify physiological-biochemical traits strongly associated to crop performance and yield determination processes under these stressful field environments. Two soybean cultivars were exposed during GF to ambient temperature or to HS (>32 °C for 6 h per d) during 21 d; and to field capacity or to WS (20% of available soil water content) during 35 d. Yield, grain number and weight (GN and GW) were significantly reduced under HS combined with WS. In irrigated HS yield and GN were also reduced, albeit final GW was similar to that of control, highlighting compensation mechanisms. Chlorophyll fluorescence analysis indicated that detrimental effects of HS and WS on photosynthesis were via structural capacity aspects but also through damage to photosystem II. The HS × WS decreased the availability of assimilate to grains, but also impaired the sink-grain metabolization of the remobilized products from leaves. A multivariate analysis highlighted strong correlations between quantum efficiency of photosystem II photochemistry, chlorophyll content (SPAD value), and the antioxidant state of leaves, which were all positively correlated with yield. Canopy temperature throughout grain filling (CTGF) was negatively associated with GN and GW, the latter also positively associated with SPAD. Explaining these physiological traits 81, 50, and 82% of the total variability of yield, GN and GW, respectively. To our knowledge this is the first report that integrating different scales of study, demonstrates the potential of physiological-biochemical parameters to explain yield variations in field-grown soybean under HS and WS conditions." @default.
• W2777809097 created "2018-01-05" @default.
• W2777809097 creator A5005291288 @default.
• W2777809097 creator A5041054158 @default.
• W2777809097 creator A5061294289 @default.
• W2777809097 creator A5069163586 @default.
• W2777809097 creator A5070917526 @default.
• W2777809097 date "2018-04-01" @default.
• W2777809097 modified "2023-10-14" @default.
• W2777809097 title "Heat and water stressed field-grown soybean: A multivariate study on the relationship between physiological-biochemical traits and yield" @default.
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