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Ethylene, not ABA , is closely linked to the recovery of gas exchange after drought in four Caragana species
Author(s) -
Yao GuangQian,
Li FengPing,
Nie ZhengFei,
Bi MinHui,
Jiang Hui,
Liu XuDong,
Wei Yang,
Fang XiangWen
Publication year - 2021
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/pce.13934
Subject(s) - stomatal conductance , dehydration , transpiration , abscisic acid , ethylene , caragana , biology , drought tolerance , botany , horticulture , photosynthesis , chemistry , biochemistry , gene , catalysis
Drought is a cyclical phenomenon in natural environments. During dehydration, stomatal closure is mainly regulated by abscisic acid (ABA) dynamics that limit transpiration in seed plants, but following rehydration, the mechanism of gas exchange recovery is still not clear. In this study, leaf water potential ( ψ leaf ), stomatal conductance ( g s ), leaf hydraulic conductance ( K leaf ), foliar ABA level, ethylene emission rate in response to dehydration and rehydration were investigated in four Caragana species with isohydric ( Caragana spinosa and C. pruinosa ) and anisohydric ( C. intermedia and C. microphylla ) traits. Two isohydric species with ABA‐induced stomatal closure exhibited more sensitive g s and K leaf to decreasing ψ leaf than two anisohydric species which exhibited a switch from ABA to water potential‐driven stomatal closure during dehydration. Following rehydration, the recovery of gas exchange was not associated with a decrease in ABA level but was strongly limited by the degradation of the ethylene emission rate in all species. Furthermore, two anisohydric species with low drought‐induced ethylene production exhibited more rapid recovery in gas exchange upon rehydration. Our results indicated that ethylene is a key factor regulating the drought‐recovery ability in terms of gas exchange, which may shape species adaptation to drought and potential species distribution.