Effects of foliar application of magnesium sulfate on photosynthetic characteristics, dry matter accumulation and its translocation, and carbohydrate metabolism in grain during wheat grain filling

Ba, Qingsong and Zhang, Lanlan and Chen, Sixiao and Li, Guiping and Wang, Weilun (2020) Effects of foliar application of magnesium sulfate on photosynthetic characteristics, dry matter accumulation and its translocation, and carbohydrate metabolism in grain during wheat grain filling. CEREAL RESEARCH COMMUNICATIONS, 48 (2). pp. 157-163. ISSN 0133-3720 (print), 1788-9170 (online)

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Abstract

Our previous studies showed that foliar applied magnesium sulfate during the booting stage can efectively increase wheat grain weight. To explore the efects of foliar application of magnesium sulfate during wheat grain flling on photosynthetic characteristics of fag leaf and grain flling, an experiment was conducted using winter wheat cultivars to assess the efects of foliar application of magnesium sulphate on photosynthetic characteristics of fag leaves, carbohydrate metabolism in grains, and dry matter translocation in diferent organs in the Zhoumai 27 and Aikang 58 cultivars at diferent growth stages. The results indicated throughout the diferent stages of growth, the fag leaves exhibited a high net photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration (Tr), and a decrease in the concentration of intercellular CO2 (Ci). Therefore, foliar application of magnesium sulfate during the booting stage maintained high canopy photosynthesis after anthesis. Simultaneously, exogenous supply of magnesium sulphate enhanced the sucrose synthase (SUS) and invertase (INV) enzyme activities in detached wheat grains, meanwhile reinforced the activities of most starch synthesis enzyme such as ADP-glucose pyrophosphorylase and soluble starch synthase, and consequently lead to a higher content of grain starch. Furthermore, feld experiment also confrmed foliar application of magnesium sulphate can improve superior dry matter accumulation and translocation in grain.

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