Physiological responses of orchid pseudobulbs to drought stress are related to their age and plant life form

	Physiological responses of orchid pseudobulbs to drought stress are related to their age and plant life form
	Li, Jia-Wei 1,2,3; Zhang, Shi-Bao1,2
	2019
发表期刊	PLANT ECOLOGY
ISSN	1385-0237
卷号	220 期号:1 页码:83-96
摘要	As storage organs for water and nutrients, pseudobulbs play an important role in the survival of orchids. However, the differences in morphological and physiological responses of pseudobulbs to drought stress between epiphytic and terrestrial orchids remain undefined, and little is known about the physiological imparity of different-aged pseudobulbs. We investigated the anatomy and changes in physiology of pseudobulbs in an epiphytic orchid (Cymbidium tracyanum) and a terrestrial orchid (C. sinense) and compared their responses and recovery during and after periods of drought stress. In particular, ramets severance treatment and multiple leafless pseudobulbs treatment were applied for C. tracyanum to verify the utilization strategy for the stored water. When compared with C. sinense, the pseudobulbs of C. tracyanum have larger water-storage cells and higher water content, and the enhanced water storage of C. tracyanum can be used and recovered more rapidly. And they had more flexibility in shifting stored nonstructural carbohydrates. The remarkably high concentration and different change trends of abscisicacid (ABA) between different-aged pseudobulbs under drought stress were only found in C. tracyanum. When pseudobulb age was considered, the stored water and carbohydrate changed more rapidly in the youngest pseudobulbs of both species in response to stress. Our results indicated that the pseudobulbs differ in their means for coping with drought conditions according to their life form and age. These findings contribute to our understanding about the functionaldiversification of pseudobulbs and their strategies for ecological adaptations.
关键词	Pseudobulb Orchid Drought Epiphytic Terrestrial
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/64401
专题	资源植物与生物技术所级重点实验室
通讯作者	Zhang, Shi-Bao
作者单位	1.Chinese Acad Sci, Key Lab Econ Plants & Biotechnol, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China 2.Yunnan Key Lab Wild Plant Resources, Kunming 650201, Yunnan, Peoples R China 3.Chinese Acad Sci, CAS Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Mengla 666303, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Li, Jia-Wei,Zhang, Shi-Bao. Physiological responses of orchid pseudobulbs to drought stress are related to their age and plant life form[J]. PLANT ECOLOGY,2019,220(1):83-96.
APA	Li, Jia-Wei,&Zhang, Shi-Bao.(2019).Physiological responses of orchid pseudobulbs to drought stress are related to their age and plant life form.PLANT ECOLOGY,220(1),83-96.
MLA	Li, Jia-Wei,et al."Physiological responses of orchid pseudobulbs to drought stress are related to their age and plant life form".PLANT ECOLOGY 220.1(2019):83-96.

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