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

IF 4.6 1区 生物学 Q1 PLANT SCIENCES
Plant Diversity Pub Date : 2024-02-08 eCollection Date: 2024-05-01 DOI:10.1016/j.pld.2024.02.003
Ya-Dong Qie, Qi-Wei Zhang, Scott A M McAdam, Kun-Fang Cao
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引用次数: 0

Abstract

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, stomatal 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.

九种真红树林物种的气孔动态受叶片水力特征和防护细胞解剖结构的调节。
气孔调节对红树林在超盐碱潮间带生存至关重要,因为潮间带水压力大,水供应波动剧烈。然而,人们对红树林气孔对蒸汽压力不足(VPD)的敏感性及其与气孔形态和叶片水力特征的协调性知之甚少。我们测量了五科九种真正的红树林物种的气孔对蒸气压差阶跃增加的原位响应、气孔解剖、叶片水力脆弱性和压力-体积特征,并收集了基因组大小数据。我们的目的是回答两个问题:(1) 气孔形态是否影响红树林气孔对高 VPD 的动态响应? 同时考虑基因组大小对气孔形态的可能影响;(2) 叶片水力特征是否影响红树林气孔对 VPD 的敏感性?我们发现,红树林植物的气孔对阶跃上升的 VPD 高度敏感,气孔反应直接受气孔解剖学和水力特征的影响。在根瘤菌科的所有物种中,气孔越小越密集与高 VPD 时气孔关闭速度越快相关,气孔大小与基因组大小呈负相关,叶脉密度与基因组大小呈正相关。叶片在完全张力下的负渗透压(πo)较低与稳态气孔导度(gs)较高有关;叶片电容(Cleaf)较高和叶木质部抗栓塞能力较强与气孔对 VPD 增加的反应较慢有关。此外,气孔对 VPD 的反应速度还受到叶片形态特征的间接影响,而叶片形态特征又受到现场盐度的影响,进而影响叶片的水分状态。我们的研究结果表明,红树林在基因组大小、气孔大小和叶脉排列之间显示出一种独特的关系,气孔对VPD的反应能力受叶片水分特征和气孔形态的调节。我们的工作提供了一个定量框架,有助于更好地理解高盐度和动态水供应环境中红树林的气孔调节。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Plant Diversity
Plant Diversity Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics
CiteScore
8.30
自引率
6.20%
发文量
1863
审稿时长
35 days
期刊介绍: Plant Diversity (formerly Plant Diversity and Resources) is an international plant science journal that publishes substantial original research and review papers that advance our understanding of the past and current distribution of plants, contribute to the development of more phylogenetically accurate taxonomic classifications, present new findings on or insights into evolutionary processes and mechanisms that are of interest to the community of plant systematic and evolutionary biologists. While the focus of the journal is on biodiversity, ecology and evolution of East Asian flora, it is not limited to these topics. Applied evolutionary issues, such as climate change and conservation biology, are welcome, especially if they address conceptual problems. Theoretical papers are equally welcome. Preference is given to concise, clearly written papers focusing on precisely framed questions or hypotheses. Papers that are purely descriptive have a low chance of acceptance. Fields covered by the journal include: plant systematics and taxonomy- evolutionary developmental biology- reproductive biology- phylo- and biogeography- evolutionary ecology- population biology- conservation biology- palaeobotany- molecular evolution- comparative and evolutionary genomics- physiology- biochemistry
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