Two strategies by epiphytic orchids for maintaining water balance: thick cuticles in leaves and water storage in pseudobulbs

CORC > 昆明植物研究所 > 中国科学院昆明植物研究所 > 资源植物与生物技术所级重点实验室

	Two strategies by epiphytic orchids for maintaining water balance: thick cuticles in leaves and water storage in pseudobulbs
	Yang, Shi-Jian 1,2; Sun, Mei 2,3; Yang, Qiu-Yun 1; Ma, Ren-Yi1,2 ; Zhang, Jiao-Lin 2; Zhang, Shi-Bao1
刊名	AOB PLANTS
	2016
卷号	8
关键词	Cuticles Dendrobium pseudobulb relative water content water conservation water loss
英文摘要	Epiphytes are an important component of tropical and subtropical flora, and serve vital ecological functions in forest hydrology and nutrient fluxes. However, they often encounter water deficits because there is no direct contact between their roots and the soil. The strategies employed by epiphytes for maintaining water balance in relatively water-limited habitats are not completely understood. In the present study, we investigated the anatomical traits, water loss rates, and physiology of leaves and pseudobulbs of four Dendrobium species with different pseudo-bulb morphologies to understand the roles of leaf and pseudobulb in maintaining water balance of epiphytic orchids. Our results showed that two species (D. chrysotoxum and D. officinale), with lower rates of water loss, have thicker leaves and upper cuticles, but lower epidermal thickness and leaf dry mass per area. In contrast, the other two species (D. chrysanthum and D. crystallinum) with thinner cuticles and higher rates of water loss, have less tissue density and greater saturated water contents in their pseudobulbs. Therefore, our results indicate that these latter two species may resist drought by storing water in the pseudobulbs to compensate for their thin cuticles and rapid water loss through the leaves. Under the same laboratory conditions, excised pseudobulbs with attached leaves had lower rates of water loss when compared with samples comprising only excised leaves. This implies that epiphytic orchids utilize two different strategies for sustaining water balance: thick cuticles to conserve water in leaves and water storage in pseudobulbs. Our results also show that Dendrobium species with thin cuticles tend to have pseudobulbs with high water storage capacity that compensates for their faster rates of water loss. These outcomes contribute to our understanding of the adaptive water-use strategies in Dendrobium species, which is beneficial for the conservation and cultivation of epiphytic orchids.
类目[WOS]	Plant Sciences
研究领域[WOS]	Plant Sciences
关键词[WOS]	CRASSULACEAN ACID METABOLISM ; MONTANE CLOUD FOREST ; TROPICAL EPIPHYTES ; VASCULAR EPIPHYTES ; AERIAL ROOTS ; COSTA-RICA ; TERRESTRIAL ; TRAITS ; CANOPY ; GROWTH
收录类别	SCI
语种	英语
WOS记录号	WOS:000392247600001
内容类型	期刊论文
源URL	[http://ir.kib.ac.cn/handle/151853/45642]
专题	昆明植物研究所_资源植物与生物技术所级重点实验室
作者单位	1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Econ Plants & Biotechnol, Kunming 650201, Yunnan, Peoples R China 2.Chinese Acad Sci, Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Mengla 666303, Yunnan, Peoples R China 3.Natl Plateau Wetlands Res Ctr, Kunming 650224, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Yang, Shi-Jian,Sun, Mei,Yang, Qiu-Yun,et al. Two strategies by epiphytic orchids for maintaining water balance: thick cuticles in leaves and water storage in pseudobulbs[J]. AOB PLANTS,2016,8.
APA	Yang, Shi-Jian,Sun, Mei,Yang, Qiu-Yun,Ma, Ren-Yi,Zhang, Jiao-Lin,&Zhang, Shi-Bao.(2016).Two strategies by epiphytic orchids for maintaining water balance: thick cuticles in leaves and water storage in pseudobulbs.AOB PLANTS,8.
MLA	Yang, Shi-Jian,et al."Two strategies by epiphytic orchids for maintaining water balance: thick cuticles in leaves and water storage in pseudobulbs".AOB PLANTS 8(2016).