Effects of Elevated Temperature on Pisum sativum Nodule Development: II-Phytohormonal Responses

High temperature is one of the most important factors limiting legume productivity. We have previously shown the induction of senescence in the apical part of nodules of the pea SGE line, formed by bv. strain 3841, when they were exposed to elevated temperature (28 °C). In this study, we analyzed th...

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Veröffentlicht in:International journal of molecular sciences 2023-12, Vol.24 (23), p.17062
Hauptverfasser: Kitaeva, Anna B, Serova, Tatiana A, Kusakin, Pyotr G, Tsyganov, Viktor E
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creator Kitaeva, Anna B
Serova, Tatiana A
Kusakin, Pyotr G
Tsyganov, Viktor E
description High temperature is one of the most important factors limiting legume productivity. We have previously shown the induction of senescence in the apical part of nodules of the pea SGE line, formed by bv. strain 3841, when they were exposed to elevated temperature (28 °C). In this study, we analyzed the potential involvement of abscisic acid (ABA), ethylene, and gibberellins in apical senescence in pea nodules under elevated temperature. Immunolocalization revealed an increase in ABA and 1-aminocyclopropane-1-carboxylic acid (ACC, the precursor of ethylene biosynthesis) levels in cells of the nitrogen fixation zone in heat-stressed nodules in 1 day of exposure compared to heat-unstressed nodules. Both ABA and ethylene appear to be involved in the earliest responses of nodules to heat stress. A decrease in the gibberellic acid (GA ) level in heat-stressed nodules was observed. Exogenous GA treatment induced a delay in the degradation of the nitrogen fixation zone in heat-stressed nodules. At the same time, a decrease in the expression level of many genes associated with nodule senescence, heat shock, and defense responses in pea nodules treated with GA at an elevated temperature was detected. Therefore, apical senescence in heat-stressed nodules is regulated by phytohormones in a manner similar to natural senescence. Gibberellins can be considered as negative regulators, while ABA and ethylene can be considered positive regulators.
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source MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; MDPI - Multidisciplinary Digital Publishing Institute; PubMed Central
subjects Abscisic acid
Abscisic Acid - metabolism
Biosynthesis
Cytoplasm
Ethylenes
Food
Gibberellins
Heat
High temperature
Infections
Legumes
Nitrogen
Nitrogen Fixation - genetics
Peas
Plant Growth Regulators
Regulation
Rhizobium leguminosarum - genetics
Seasons
Seeds
Senescence
Symbiosis - physiology
Temperature
title Effects of Elevated Temperature on Pisum sativum Nodule Development: II-Phytohormonal Responses
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