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题名: Differentiation of water-related traits in terrestrial and epiphytic Cymbidium species
作者: null(张石宝)1, 2; Dai, Yan3; Hao, Guang-You4, 5; Li, Jia-Wei1; Fu, Xue-Wei1; Zhang, Jiao-Lin3
刊名: FRONTIERS IN PLANT SCIENCE
关键词: Cymbidium ; drought tolerance ; epiphytes ; photosynthesis ; succulence ; water loss ; water storage ; water supply
英文摘要: Epiphytes that grow in the canopies of tropical and subtropical forests experience different water regimes when compared with terrestrial plants. However, the differences in adaptive strategies between epiphytic and terrestrial plants with respect to plant water relations remain poorly understood. To understand how water-related traits contrast between epiphytic and terrestrial growth forms within the Cymbidium (Orchidaceae), we assessed leaf anatomy, hydraulics, and physiology of seven terrestrial and 13 epiphytic species using a common garden experiment. Compared with terrestrial species, epiphytic species had higher values for leaf mass per unit area (LMA), leaf thickness (LT), epidermal thickness, saturated water content (SWC) and the time required to dry saturated leaves to 70% relative water content (T-70). However, vein density (D-vein), stomatal density (SD), and photosynthetic capacity (A(max)) did not differ significantly between the two forms. T-70 was positively correlated with LT, LMA, and SWC, and negatively correlated with stomatal index (SI). Amax showed positive correlations with SD and SI, but not with D-vein. Vein density was marginally correlated with SD, and significantly correlated with SI. Overall, epiphytic orchids exhibited substantial ecophysiological differentiations from terrestrial species, with the former type showing trait values indicative of greater drought tolerance and increased water storage capacity. The ability to retain water in the leaves plays a key role in maintaining a water balance in those epiphytes. Therefore, the process of transpiration depends less upon the current substrate water supply and enables epiphytic Cymbidium species to adapt more easily to canopy habitats.
出版日期: 2015-04-22
卷号: 6, 页码:260
DOI标识: 10.3389/fpls.2015.00260
语种: 英语
收录类别: SCI
学科分类: Plant Sciences
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内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/19380
Appears in Collections:资源植物与生物技术所级重点实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Econ Plants & Biotechnol, Kunming 650201, Yunnan, Peoples R China
2.Yunnan Key Lab Wild Plant Resources, Kunming, Peoples R China
3.Chinese Acad Sci, Key Lab Trop Forest Ecol, Xshuangbanna Trop Bot Garden, Kunming, Peoples R China
4.Chinese Acad Sci, Inst Appl Ecol, State Key Lab Forest & Soil Ecol, Shenyang 110016, Peoples R China
5.Harvard Univ, Arnold Arboretum, Boston, MA 02115 USA
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