Hydraulic traits are coupled with plant anatomical traits under drought–rewatering cycles in Ginkgo biloba L

Autor: Shan Li, Xin Li, Jie Wang, Zhicheng Chen, Sen Lu, Xianchong Wan, Hongyan Sun, Li Wang, Sylvain Delzon, Herve Cochard, Xiaomei Jiang, Jianhua Shu, Jingming Zheng, Yafang Yin
Přispěvatelé: Chinese Academy of Forestry, Institut de Physique de Nice (INPHYNI), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), Academy of Mathematics and Systems Science (AMSS), Chinese Academy of Sciences [Beijing] (CAS), Shaanxi University of Science and Technology, Princeton University, Biologie Cellulaire et Cancer, Institut Curie [Paris]-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Biodiversité, Gènes & Communautés (BioGeCo), Université de Bordeaux (UB)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Laboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant (PIAF), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Clermont Auvergne (UCA), Beijing Inst Landscape Architecture, Beijing Forestry University, Beijing Natural Science Foundation 6184048National Natural Science Foundation of China (NSFC) 32001291Talent Project of Shaanxi University of Science and Technology126022037
Rok vydání: 2021
Předmět:
Zdroj: Tree Physiology
Tree Physiology, 2021, 12 p. ⟨10.1093/treephys/tpab174⟩
ISSN: 1758-4469
0829-318X
DOI: 10.1093/treephys/tpab174
Popis: Investigating the responses of plant anatomical traits of trees to drought–rewatering cycles helps us to understand their responses to climate change; however, such work has not been adequately reported. In this study, Ginkgo biloba L. saplings were subjected to moderate, severe, extreme and lethal drought conditions by withholding water according to the percentage loss of hydraulic conductivity (PLC) and rewatering on a regular basis. Samples of phloem, cambium and xylem were collected to quantify their cellular properties including cambium and phloem cell vitality, xylem growth ring width, pit aspiration rates and pit membrane thickness using light microscopy and transmission microscopy. The results showed that the mortality rate of G. biloba saplings reached 90% at approximately P88 (xylem water potential inducing 88% loss of hydraulic conductivity). The onset of cambium and phloem cell mortality might be in accordance with that of xylem embolism. Close negative correlations between xylem water potential and PLC and between xylem water potential and cambium and phloem mortality suggested that xylem hydraulic traits are coupled with anatomical traits under declining xylem water potential. Cambium and phloem cell vitality as well as xylem growth ring width decreased significantly with increasing drought conditions. However, xylem pit membrane thickness, cambial zone width and cambial cell geometry were not affected by the drought–rewatering cycles. The tracheid radial diameter, intertracheid cell wall thickness and tracheid density decreased significantly during both drought conditions and rewatering conditions. In addition to hydraulic traits, cambium and phloem cell vitality can be used as anatomical traits to evaluate the mortality of G. biloba under drought. Future work is proposed to observe the dynamics of pit aspiration rates under drought–rewatering cycles in situ to deepen our understanding of the essential role of bordered pits in the ‘air-seeding’ mechanism.
Databáze: OpenAIRE
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