干旱区生态环境知识资源中心(Arid): Costs and benefits of photosynthetic stems in desert species from southern California

Arid

DOI	10.1071/FP18203
	Costs and benefits of photosynthetic stems in desert species from southern California
	Avila-Lovera, Eleinis 1,2; Haro, Roxana 1; Ezcurra, Exequiel 1; Santiago, Louis S.1,3
通讯作者	Avila-Lovera, Eleinis
来源期刊	FUNCTIONAL PLANT BIOLOGY
ISSN	1445-4408
EISSN	1445-4416
出版年	2019
卷号	46 期号:2 页码:175-186
英文摘要	Woody plants with green photosynthetic stems are common in dry woodlands with the possible advantages of extra carbon gain, re-assimilation of CO2, and high water-use efficiency. However, their green stem tissue may also incur greater costs of water loss when stomata are closed. Our study focussed on evaluating the costs and benefits of having green stems in desert plants, addressing the water-use efficiency hypothesis. We measured water status, carbon and water exchange, and carbon, nitrogen and oxygen isotopic composition of 15 species in a desert wash scrub in Joshua Tree National Park, California, USA. We found that all woody species that have green stems relied on their green stems as the sole organ for carbon assimilation for most of the study period. Green stems had similar photosynthetic rate (A(max)), stomatal conductance (g(s)) and intrinsic water-use efficiency (WUEi) to leaves of the same species. However, A(max), g(s) and cuticular conductance (g(min)) were higher in green stems than in leaves of non-green stemmed species. Carbon isotopic composition (C-13) was similar in both leaves and green stems, indicating no difference in integrated long-term WUE. Our results raise questions about the possible trade-off between carbon gain and water loss through the cuticle in green stems and how this may affect plant responses to current and future droughts.
英文关键词	carbon isotopes gas exchange oxygen isotopes water relations water-use efficiency
类型	Article
语种	英语
国家	USA ; Panama
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000454694200007
WOS关键词	CARBON-ISOTOPE DISCRIMINATION ; WOODY TISSUE PHOTOSYNTHESIS ; WATER-USE EFFICIENCY ; GAS-EXCHANGE ; STOMATAL CONDUCTANCE ; ERIOGONUM-INFLATUM ; CERCIDIUM FLORIDUM ; SEASONAL PATTERNS ; DROUGHT SURVIVAL ; SUCCULENT TREES
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215851
作者单位	1.Univ Calif Riverside, Dept Bot & Plant Sci, 2150 Batchelor Hall, Riverside, CA 92521 USA; 2.Univ Calif Riverside, Dept Evolut Ecol & Organismal Biol, Evolut Ecol & Organismal Biol Grad Program, Riverside, CA 92521 USA; 3.Smithsonian Trop Res Inst, Apartado 0843-03092, Panama City, Panama
推荐引用方式 GB/T 7714	Avila-Lovera, Eleinis,Haro, Roxana,Ezcurra, Exequiel,et al. Costs and benefits of photosynthetic stems in desert species from southern California[J],2019,46(2):175-186.
APA	Avila-Lovera, Eleinis,Haro, Roxana,Ezcurra, Exequiel,&Santiago, Louis S..(2019).Costs and benefits of photosynthetic stems in desert species from southern California.FUNCTIONAL PLANT BIOLOGY,46(2),175-186.
MLA	Avila-Lovera, Eleinis,et al."Costs and benefits of photosynthetic stems in desert species from southern California".FUNCTIONAL PLANT BIOLOGY 46.2(2019):175-186.