文献类型：期刊文献

英文题名：A whole-plant perspective of hydraulic strategy in temperate desert shrub species

作者：Tan, Fengsen[1,2,3] Li, Xu[1,2,3] Cao, Wenxu[1,2,3] Zhu, Shidan[4] Duan, Na[5] Li, Qinghe[1,2,3]

第一作者：Tan, Fengsen

通信作者：Li, QH[1];Li, QH[2];Li, QH[3]

机构：[1]Chinese Acad Forestry, State Key Lab Efficient Prod Forest Resources, Xiangshan Rd, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, Key Lab Tree Breeding & Cultivat Natl Forestry & G, Xiangshan Rd, Beijing 100091, Peoples R China;[3]Chinese Acad Forestry, Res Inst Forestry, Xiangshan Rd, Beijing 100091, Peoples R China;[4]Guangxi Univ, Guangxi Key Lab Forest Ecol & Conservat, Coll Forestry, East Daxue Rd, Nanning 530004, Peoples R China;[5]Chinese Acad Forestry, Expt Ctr Desert Forestry, Tuanjie Rd, Dengkou 015200, Peoples R China

年份：2024

卷号：44

期号：11

外文期刊名：TREE PHYSIOLOGY

收录：;Scopus(收录号：2-s2.0-85199508435);WOS:【SCI-EXPANDED(收录号:WOS:001355754900001)】；

基金：We thank Min Li for assistances in field works. We thank Guan Xin-Yi for technical assistance. This research was supported by the National Long-Term Scientific Research Base of Ulan Buh Desert Comprehensive Control, National Forestry and Grassland Administration, Dengkou 015200, China.

语种：英文

外文关键词：coordination; embolism resistance; hydraulic safety margin; segmentation; specific root length; turgor loss point

摘要：Desert shrubs play a crucial role in controlling desertification and promoting revegetation, but drought often hinders their growth. Investigating the hydraulic strategies of desert shrubs is important in order to understand their drought adaptation and predict future dynamics under climate change. In this study, we measured the hydraulic-related characteristics of roots, stems and leaves in 19 desert shrub species from northern China. We aimed to explore the hydraulic coordination and segmentation between different plant organs. The results were as follows: (i) specific root length was positively correlated with the water potential inducing a 50% loss in stem hydraulic conductivity (P50(stem)) and negatively correlated with stem hydraulic safety margin. This suggested that water uptake efficiency of the fine roots was traded off with stem embolism resistance and hydraulic safety. (ii) The water potential inducing a 50% loss in leaf hydraulic conductance was significantly less negative than P50(stem), and fine root turgor loss point was significantly less negative than P50(stem), indicating a hydraulic segmentation between the main stem and terminal organs. (iii) The most negative leaf turgor loss point indicated that leaf wilting occurred after substantial leaf and stem embolism. The high desiccation resistance of the leaves may serve as an important physiological mechanism to increase carbon gain in a relatively brief growth period. In summary, this study elucidated the hydraulic strategies employed by desert shrubs from a whole-plant perspective.