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Physiological responses of orchid pseudobulbs to drought stress are related to their age and plant life form
Li, Jia-Wei; Zhang, Shi-Bao
2019
Source PublicationPLANT ECOLOGY
ISSN1385-0237
Volume220Issue:1Pages:83-96
Abstract

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.

KeywordBaobab Trees Adansonia Water Relations Growth-rate Photosynthesis Integration Gene Aba Aquaporins Epiphytes Ecology
Subject AreaPlant Sciences ; Environmental Sciences & Ecology ; Forestry
DOI10.1007/s11258-018-00904-x
Indexed BySCI
Language英语
WOS IDWOS:000456987700007
Citation statistics
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/11233
Collection其他
Affiliation1.[Li, Jia-Wei
2.Chinese Acad Sci, Key Lab Econ Plants & Biotechnol, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China
3.[Li, Jia-Wei
4.Yunnan Key Lab Wild Plant Resources, Kunming 650201, Yunnan, Peoples R China
5.Chinese Acad Sci, CAS Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Mengla 666303, Yunnan, Peoples R China
Recommended Citation
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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