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Ecophysiological responses of two closely related Magnoliaceae genera to seasonal changes in subtropical China

Journal of Plant Ecology 2018年第3期11卷 434-444页

作者： Hui Liu Liwei Zhu Qiuyuan Xu Marjorie R.Lundgren Keming Yang Ping Zhao Qing Ye Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical GardenChinese Academy of SciencesXingke Road 723Guangzhou 510650China Guangdong Provincial Key Laboratory of Applied Botany South China Botanical GardenChinese Academy of SciencesGuangzhou 510650China University of Chinese Academy of Sciences Yuquan Road 191Beijing 100049China Department of Animal and Plant Sciences University of SheffieldSheffield S102TNUK Horticulture Center South China Botanical GardenChinese Academy of SciencesGuangzhou 510520China

Aims Plants use a variety of hydraulic strategies to adapt to seasonal drought that differ by species and environmental *** early-diverging Magnoliaceae family includes two closely related genera with contrasting leaf habits,Yulania(deciduous)and Michelia(evergreen),which naturally inhabit temperate and tropi-cal regions,***,we evaluate the hydraulic strategy of species from both genera that have been ex situ conserved in a subtropical region to determine how they respond to the novel cool-dry season climatic *** We measured ecophysiological traits in five Michelia and five Yulania species conserved in the South China Botanical Garden in both wet and dry season conditions and monitored the whole-year sap flow for four of these *** Findings We found that Magnoliaceae species that have been ex situ con-served in a subtropical climate did not suffer from excessive water stress due to the mild drought conditions of the dry season and the ecophysiological adjustments the species made to avoid this stress,which differed by leaf ***,deciduous species com-pletely shed their leaves during the dry season,while evergreen species decreased their turgor loss points,dry mass based photo-synthetic rates,stomatal conductance and specific leaf areas(SLAs)compared to wet season *** comparing the two dis-tinct leaf habits during the wet season,the leathery-leaved evergreen species had higher leaf hydraulic conductance and leaf to sapwood area ratios than the papery-leaved deciduous species,while the deciduous species had greater hydraulic conductivity calculated on both a stem and leaf area basis,dry mass based photosynthetic rates,leaf nutrients,SLAs and stomatal sizes than the evergreen ***,species from both genera maintained similar sap flow in the wet *** photosynthetically active radia-tion and vapour pressure deficit affected the diurnal patterns of sap flow in the wet season,

关键词： hydraulic conductivity leaf habit leaf turgor loss point phylogeny photosynthesis sap flow stomata

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