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Are the well-fed less thirsty?Effects of drought and salinity on New Zealand mangroves

Journal of Plant Ecology 2022年第1期15卷 85-99页

作者： Sridevi Ravi martin k-fbader Tim Young Mark Duxbury Michael Clearwater Cate Macinnis-Ng Sebastian Leuzinger School of Science Auckland University of TechnologyAucklandNew Zealand Department of Forestry and Wood Technology Linnaeus UniversityVäxjöSweden Centre for Biomedical and Chemical Sciences School of ScienceAuckland University of TechnologyAucklandNew Zealand School of Science and Environmental Research Institute University of WaikatoPrivate Bag 3105HamiltonNew Zealand School of Biological Sciences and Te Pūnaha Matatini University of AucklandAucklandNew Zealand

Despite a large number of studies examining the effects of abiotic stress factors on plants,the mechanistic explanations of drought-induced tree mortality remain inconclusive and even less is known about how multiple stressors *** role of non-structural carbohydrates(NSCs)in preventing or postponing drought mortality is gaining ***,we tested the role of NSCs in mitigating the effects of drought and salinity in New Zealand mangroves,Avicennia marina *** experimentally manipulated plant NSC levels,prior to subjecting them to combinations of drought and *** growth and survival rates were 2-and 3-fold higher in the high-NSC(H-NSC)group than in the low-NSC(L-NSC)group under high salinity and drought conditions,*** 12 weeks under high salinity-high drought conditions,the H-NSC group showed higher stem hydraulic conductivity(281±50 mmol cm^(−1)s^(−1)MPa^(−1))compared with the L-NSC group(134±40 mmol cm^(−1)s^(−1)MPa^(−1)).Although starch levels remained relatively constant,we found a 20%increase in soluble sugars in the stems of H-NSC group under high drought and high salinity in week 8 compared with week *** results suggest(i)an important role of NSCs in mitigating the effects of low soil water potential caused by drought and salinity,and(ii)sink-limited growth under conditions of combined salinity and drought.

关键词： non-structural carbohydrates Avicennia marina subsp.australasica drought and salt tolerance carbon limitation temperate mangroves

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