Abscisic acid prevents pollen abortion under high-temperature stress by mediating sugar metabolism in rice spikelets

Physiologia Plantarum
Islam Md RezaulWeimeng Fu

Abstract

Heat stress at the pollen mother cell (PMC) meiotic stage leads to pollen sterility in rice, in which the reactive oxygen species (ROS) and sugar homeostasis are always adversely affected. This damage is reversed by abscisic acid (ABA), but the mechanisms underlying the interactions among the ABA, sugar metabolism, ROS and heat shock proteins in rice spikelets under heat stress are unclear. Two rice genotypes, Zhefu802 (a recurrent parent) and fgl (its near-isogenic line) were subjected to heat stress of 40°C after pre-foliage sprayed with ABA and its biosynthetic inhibitor fluridone at the meiotic stage of PMC. The results revealed that exogenous application of ABA reduced pollen sterility caused by heat stress. This was achieved through various means, including: increased levels of soluble sugars, starch and non-structural carbohydrates, markedly higher relative expression levels of heat shock proteins (HSP24.1 and HSP71.1) and genes related to sugar metabolism and transport, such as sucrose transporters (SUT) genes, sucrose synthase (SUS) genes and invertase (INV) genes as well as increased antioxidant activities and increased content of adenosine triphosphate and endogenous ABA in spikelets. In short, exogenous application ...Continue Reading

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Citations

Jul 2, 2019·The New Phytologist·Monica BorghiAlisdair R Fernie
Jun 11, 2019·Frontiers in Plant Science·Ettore Pacini, Rudy Dolferus
Nov 30, 2019·Plant Science : an International Journal of Experimental Plant Biology·B H FengG F Fu
Mar 2, 2021·Frontiers in Plant Science·Ning LiWoe Yeon Kim
Feb 24, 2021·Journal of Experimental Botany·Caitlin E MooreAmanda P Cavanagh
Jun 4, 2021·Journal of Experimental Botany·Christian Danve M Castroverde, Damaris Dina
Aug 6, 2021·Plant Cell Reports·Smita Chaudhry, Gagan Preet Singh Sidhu

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