Abstract
Leaf senescence is a developmentally programmed event, but the initiation and progression of leaf senescence are affected by a range of plant hormones including abscisic acid (ABA), ethylene and methyl jasmonate (MeJA). To investigate plant hormone crosstalk during leaf senescence, hormone-induced senescence phenotypes were analyzed in three leaf senescence mutants [ore1 (oresara1), ore3 and ore9] showing delayed senescence phenotypes in age-dependent and dark-induced senescence. The ore mutants exhibited delayed leaf senescence phenotypes following treatment with ABA, ACC (aminocyclo-propane-1-carboxylic acid) or MeJA. After each hormone treatment, the photochemical efficiency of photosystem II and chlorophyll content were significantly higher in the ore mutant leaves than in the wild-type leaves. The expression of CAB2 and SEN4 in the wild-type was rapidly altered following each hormone treatment. However, the decrease in CAB2 expression and the induction of SEN4 expression in the mutants were less affected by ABA, ACC or MeJA treatment. It is suggested that ORE1, ORE3 and ORE9 are required for the proper progression of leaf senescence mediated by ABA, ethylene and MeJA. This implies that ORE1, ORE3 and ORE9 may be linked to the crosstalk among senescence pathways induced by ABA, ethylene and MeJA, as well as age and darkness.
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Kim, J.H., Chung, K.M. & Woo, H.R. Three positive regulators of leaf senescence in Arabidopsis, ORE1, ORE3 and ORE9, play roles in crosstalk among multiple hormone-mediated senescence pathways. Genes Genom 33, 373–381 (2011). https://doi.org/10.1007/s13258-011-0044-y
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DOI: https://doi.org/10.1007/s13258-011-0044-y