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In tropical montane areas, water limitation is a common occurrence, and both pioneer and forests species experience water stress during the dry season. Adjustments of leaf area during periods of drought allow for the maintenance of the water supply and physiological functions of the remaining leaves. Here, we compared leaf blade water relations between pioneer and forest tree species. Leaf pressure-volume (P-V) curves were determined from samples taken prior to the dry season, to assess how leaves of the different species were adapted to prepare for and endure water deficits. The following parameters were calculated: osmotic potential at full (Ψπ(100)) and zero (Ψπ(0)) turgor, relative water content at zero turgor (RWC0), volumetric elastic modulus (&#949) as well as apoplasm (A) and symplasm (S) water content and their ratio (A/S). Although the pioneer and forest species occupied contrasting habitats, and both groups were clearly differentiated with respect to their water transport capability and water use efficiency, their leaf tissue water relations showed clear differences across species but not between the groups. Some species underwent leaf shedding and accumulated xylem embolisms during the dry season, and their leaves had high cell elasticity. Consequently, these species presented large cell volume changes with turgor loss. Conversely, species with rigid leaves were able to undergo lower leaf turgor with only small changes in cell volume during drought, which might aid to preserve leaf cell function, maintain water uptake, and consequently avoid accelerated leaf senescence and shedding during the dry season.
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篇名 Leaf Tissue Water Relations Are Associated with Drought-Induced Leaf Shedding in Tropical Montane Habitats
来源期刊 美国植物学期刊(英文) 学科 医学
关键词 Apoplasm Cell Volume Reduction DROUGHT ADAPTATIONS Drought-Induced Leaf-Sheding Forest Species Pioneer Trees Pressure-Volume Analysis Rigid Cells Symplasm TROPICAL Forests Volu-metric Elastic Modulus Water Relations
年,卷(期) 2015,(13) 所属期刊栏目
研究方向 页码范围 2128-2135
页数 8页 分类号 R73
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Apoplasm
Cell
Volume
Reduction
DROUGHT
ADAPTATIONS
Drought-Induced
Leaf-Sheding
Forest
Species
Pioneer
Trees
Pressure-Volume
Analysis
Rigid
Cells
Symplasm
TROPICAL
Forests
Volu-metric
Elastic
Modulus
Water
Relations
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研究去脉
引文网络交叉学科
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期刊影响力
美国植物学期刊(英文)
月刊
2158-2742
武汉市江夏区汤逊湖北路38号光谷总部空间
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1814
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0
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