气候变化领域集成服务门户(CCPortal): Xylem plasticity of root, stem, and branch in Cunninghamia lanceolata under drought stress: implications for whole-plant hydraulic integrity

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DOI	10.3389/fpls.2024.1308360
	Xylem plasticity of root, stem, and branch in Cunninghamia lanceolata under drought stress: implications for whole-plant hydraulic integrity
	Li, Shubin; Huang, Xiaoyan; Zheng, Ruping; Zhang, Maxiao; Zou, Zhiguang; Heal, Kate V.; Zhou, Lili
发表日期	2024
ISSN	1664-462X
起始页码	15
卷号	15
英文摘要	Introduction: A better understanding of xylem hydraulic characteristics in trees is critical to elucidate the mechanisms of forest decline and tree mortality from water deficit. As well as temperate forests and forests growing in arid regions, subtropical and tropical forests are also predicted to experience an increased frequency and intensity of climate change-induced drought in the near future. Methods: In this study, 1-year-old Cunninghamia lanceolata seedlings (a typical subtropical species in southern China) were selected for a continuous controlled drought pot experiment of 45 days duration. The experimental treatments were non-drought (control), light drought, moderate drought and severe drought stress, which were 80%, 60%, 50%, and 40%, respectively of soil field maximum moisture capacity. Results: The hydraulic conductivity, specific conductivity and water potential of roots, stems, and branches of C. lanceolata all decreased with the prolonging of drought in the different drought intensities. The relative decrease in these hydraulic values were greater in roots than in stems and branches, indicating that roots are more sensitive to drought. Root tracheid diameters normally reduce to ensure security of water transport with prolonged drought, whilst the tracheid diameters of stems and branches expand initially to ensure water transport and then decrease to reduce the risk of embolism with continuing drought duration. The pit membrane diameter of roots, stems and branches generally increased to different extents during the 15-45 days drought duration, which is conducive to enhanced radial water transport ability. The tracheid density and pit density of stems generally decreased during drought stress, which decreased water transport efficiency and increased embolism occurrence. Correlation analysis indicated that anatomical plasticity greatly influenced the hydraulic properties, whilst the relationships varied among different organs. In roots, tracheid diameter decreased and tracheid density increased to enhance water transport security; stems and branches may increase tracheid diameter and pit membrane diameter to increase hydraulic conductivity ability, but may increase the occurrence of xylem embolism. Discussion: In summary, under drought stress, the xylem anatomical characteristics of C. lanceolata organs were highly plastic to regulate water transport vertically and radially to maintain the trade-off between hydraulic conductivity efficiency and safety.
英文关键词	drought stress; Cunninghamia lanceolata; hydraulic properties; anatomical structure; xylem plasticity; trade-off strategy; pot experiment
语种	英语
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
WOS记录号	WOS:001176077700001
来源期刊	FRONTIERS IN PLANT SCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/305387
作者单位	Fujian Agriculture & Forestry University; Fujian Agriculture & Forestry University; University of Edinburgh; Minjiang University
推荐引用方式 GB/T 7714	Li, Shubin,Huang, Xiaoyan,Zheng, Ruping,et al. Xylem plasticity of root, stem, and branch in Cunninghamia lanceolata under drought stress: implications for whole-plant hydraulic integrity[J],2024,15.
APA	Li, Shubin.,Huang, Xiaoyan.,Zheng, Ruping.,Zhang, Maxiao.,Zou, Zhiguang.,...&Zhou, Lili.(2024).Xylem plasticity of root, stem, and branch in Cunninghamia lanceolata under drought stress: implications for whole-plant hydraulic integrity.FRONTIERS IN PLANT SCIENCE,15.
MLA	Li, Shubin,et al."Xylem plasticity of root, stem, and branch in Cunninghamia lanceolata under drought stress: implications for whole-plant hydraulic integrity".FRONTIERS IN PLANT SCIENCE 15(2024).