干旱区生态环境知识资源中心(Arid): The benefits of woody plant stem photosynthesis extend to hydraulic function and drought survival in Parkinsonia florida

Arid

DOI	10.1093/treephys/tpae013
	The benefits of woody plant stem photosynthesis extend to hydraulic function and drought survival in Parkinsonia florida
	Avila-Lovera, Eleinis; Haro, Roxana; Choudhary, Manika; Acosta-Rangel, Aleyda; Pratt, R. Brandon; Santiago, Louis S.
通讯作者	Avila-Lovera, E
来源期刊	TREE PHYSIOLOGY
ISSN	0829-318X
EISSN	1758-4469
出版年	2024
卷号	44 期号:3
英文摘要	As climate change exacerbates drought stress in many parts of the world, understanding plant physiological mechanisms for drought survival is critical to predicting ecosystem responses. Stem net photosynthesis, which is common in arid environments, may be a drought survival trait, but whether the additional carbon fixed by stems contributes to plant hydraulic function and drought survival in arid land plants is untested. We conducted a stem light-exclusion experiment on saplings of a widespread North American desert tree species, Parkinsonia florida L., and after shading acclimation, we then subjected half of the plants to a drought treatment to test the interaction between light exclusion and water limitation on growth, leaf and stem photosynthetic gas exchange, xylem embolism assessed with micro-computed tomography and gravimetric techniques, and survival. Growth, stem photosynthetic gas exchange, hydraulic function and survival all showed expected reductions in response to light exclusion. However, stem photosynthesis mitigated the drought-induced reductions in gas exchange, xylem embolism (percent loss of conductivity, PLC) and mortality. The highest mortality was in the combined light exclusion and drought treatment, and was related to stem PLC and native sapwood-specific hydraulic conductivity. This research highlights the integration of carbon economy and water transport. Our results show that additional carbon income by photosynthetic stems has an important role in the growth and survival of a widespread desert tree species during drought. This shift in function under conditions of increasing stress underscores the importance of considering stem photosynthesis for predicting drought-induced mortality not only for the additional supply of carbon, but also for its extended benefits for hydraulic function.
英文关键词	drought green stem mortality Parkinsonia florida photosynthetic stem stem net photosynthesis
类型	Article
语种	英语
开放获取类型	Green Published, hybrid
收录类别	SCI-E
WOS记录号	WOS:001179555100003
WOS关键词	TISSUE PHOTOSYNTHESIS ; CORTICULAR PHOTOSYNTHESIS ; SEASONAL PATTERNS ; EMBOLISM REPAIR ; XYLEM TENSION ; CO2 FIXATION ; CARBON GAIN ; DESERT ; TREE ; VULNERABILITY
WOS类目	Forestry
WOS研究方向	Forestry
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/405813
推荐引用方式 GB/T 7714	Avila-Lovera, Eleinis,Haro, Roxana,Choudhary, Manika,et al. The benefits of woody plant stem photosynthesis extend to hydraulic function and drought survival in Parkinsonia florida[J],2024,44(3).
APA	Avila-Lovera, Eleinis,Haro, Roxana,Choudhary, Manika,Acosta-Rangel, Aleyda,Pratt, R. Brandon,&Santiago, Louis S..(2024).The benefits of woody plant stem photosynthesis extend to hydraulic function and drought survival in Parkinsonia florida.TREE PHYSIOLOGY,44(3).
MLA	Avila-Lovera, Eleinis,et al."The benefits of woody plant stem photosynthesis extend to hydraulic function and drought survival in Parkinsonia florida".TREE PHYSIOLOGY 44.3(2024).