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The role of soluble sugars during drought in tropical tree seedlings with contrasting tolerances

Journal of Plant Ecology 2020年第4期13卷 389-397页

作者： Michael J.O’Brien Annabelle Valtat Samuel Abiven Mirjam S.Studer Robert Ong Bernhard Schmid Área de Biodiversidad y Conservación Universidad Rey Juan Carlosc/Tulipán s/n.E-28933 MóstolesMadridSpain Southeast Asia Rainforest Research Partnership The Peak VistaLorang Punjak 1Tanjung LipatKota KinabaluSabah 88400Malaysia Department of Evolutionary Biology and Environmental Studies University of ZurichWinterthurerstrasse 1908057 ZurichSwitzerland Department of Geography University of ZurichWinterthurerstrasse 1908057 ZurichSwitzerland Laboratoire de Géologie UMR 8538Ecole Normale SupérieurePSL Research UniversityCNRSParisFrance Centre de recherche enécologie expérimentale et prédictive(CEREEP-Ecotron IleDeFrance) Département de biologieEcole normale supérieureCNRSPSL University77140St-Pierre-les-NemoursFrance Forest Research Centre Sepilok90715 SandakanSabahMalaysia

Aims Non-structural carbohydrates(NSCs)are plant storage compounds used for metabolism,transport,osmoregulation and regrowth following the loss of plant *** in conditions suitable for optimal growth,plants continue to store *** storage may be due to passive accumulation from sink-inhibited growth or active reserves that come at the expense of *** former pathway implies that NSCs may be a by-product of sink limitation,while the latter suggests a functional role of NSCs for use during poor *** Using 13C pulse labelling,we traced the source of soluble sugars in stem and root organs during drought and everwet conditions for seedlings of two tropical tree species that differ in drought tolerance to estimate the relative allocation of NSCs stored prior to drought versus NSCs assimilated during *** monitored growth,stomatal conductance,stem water potential and NSC storage to assess a broad carbon response to *** Findings We found that the drought-sensitive species had reduced growth,conserved NSC concentrations in leaf,stem and root organs and had a larger proportion of soluble sugars in stem and root organs that originated from pre-drought storage relative to seedlings in control *** contrast,the drought-tolerant species maintained growth and stem and root NSC concentrations but had reduced leaf NSCs concentrations with a larger proportion of stem and root soluble sugars originated from freshly assimilated photosynthates relative to control *** results suggest the drought-sensitive species passively accumulated NSCs during water deficit due to growth inhibition,while the drought-tolerant species actively responded to water deficit by allocating NSCs to stem and root *** strategies seem correlated with baseline maximum growth rates,which supports previous research suggesting a trade-off between growth and drought tolerance while providing new evidence for the importance of plasticity in

关键词： ^(13)C labelling carbohydrate storage drought tolerance hydraulic function shorea parvifolia shorea beccariana source–sink allocation

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