Stomatal dynamics are regulated by leaf hydraulic traits and guard cell anatomy in nine true mangrove species

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外文摘要：Stomatal regulation is critical for mangroves to survive in the hyper-saline intertidal zone where water stress is severe and water availability is highly fluctuant.However,very little is known about the stomatal sensitivity to vapour pressure deficit(VPD)in mangroves,and its co-ordination with stomatal morphology and leaf hydraulic traits.We measured the stomatal response to a step increase in VPD in situ,stomatai anatomy,leaf hydraulic vulnerability and pressure-volume traits in nine true mangrove species of five families and collected the data of genome size.We aimed to answer two questions:(1)Does stomatal morphology influence stomatal dynamics in response to a high VPD in mangroves?with a consideration of possible influence of genome size on stomatal morphology;and(2)do leaf hydraulic traits influence stomatal sensitivity to VPD in mangroves?We found that the stomata of mangrove plants were highly sensitive to a step rise in VPD and the stomatal responses were directly affected by stomatal anatomy and hydraulic traits.Smaller,denser stomata was correlated with faster stomatal closure at high VPD across the species of Rhizophoraceae,and stomata size negatively and vein density positively correlated with genome size.Less negative leaf osmotic pressure at the full turgor(πo)was related to higher operating steady-state stomatal conductance(gs);and a higher leaf capacitance(Cleaf)and more embolism resistant leaf xylem were associated with slower stomatal responses to an increase in VPD.In addition,stomatal responsiveness to VPD was indirectly affected by leaf morphological traits,which were affected by site salinity and consequently leaf water status.Our results demonstrate that mangroves display a unique relationship between genome size,stomatal size and vein packing,and that stomatal responsiveness to VPD is regulated by leaf hydraulic traits and stomatal morphology.Our work provides a quantitative framework to better understand of stomatal regulation in mangroves in an environment with high salinity and dynamic water availability.

外文关键词：

Stomatal temporal kineticsVapour-pressure deficit(VPD)Leaf water relationsLeaf hydraulic vulnerabilityLeaf osmotic potentialGenome size

作者：

Ya-Dong Qie、Qi-Wei Zhang、Scott A.M.McAdam、Kun-Fang Cao

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作者单位：

State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources,College of Forestry,Guangxi University,Nanning 530004,China

Guangxi Key Laboratory of Forest Ecology and Conservation,College of Forestry,Guangxi University,Nanning 530004,China

Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection,Ministry of Education,Guangxi Normal University,Guilin 541001,China

Guangxi Key Laboratory of Landscape Resources Conservation and Sustainable Utilization in Lijiang River Basin,Guangxi Normal University,Guilin 541001,China

Purdue Center for Plant Biology,Department of Botany and Plant Pathology,Purdue University,West Lafayette,IN 47907,USA

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基金：

collaboration of the Dongzhaigang National Nature Reserve and Qinglan Harbor Provincial Mangrove Nature ReserveForestry Department of the Hainan Province for permission to conduct the field experiment in the mangrove reservesNational Natural Science Foundation of ChinaBagui Fellow scholarship of Guangxi Zhuang Autonomous Region to KFC

项目编号：

31670406C33600992001

出版年：

2024

DOI：

10.1016/j.pld.2024.02.003

植物多样性(英文)

中国科学院昆明植物研究所，中国植物学会

植物多样性(英文)

CSTPCD

影响因子：0.617

ISSN：2096-2703

年,卷(期)：2024.46(3)