Artificial defoliation soon after full leaf expansion leads to reduced shoot hydraulic conductance but constant leaf-specific conductivity in Fagus crenata Blume
{"title":"Artificial defoliation soon after full leaf expansion leads to reduced shoot hydraulic conductance but constant leaf-specific conductivity in Fagus crenata Blume","authors":"Masafumi Ueda, Kenta Izumi","doi":"10.1007/s00468-024-02494-w","DOIUrl":null,"url":null,"abstract":"<div><h3>Key message</h3><p>Hydraulic architecture and conductivity of current-year shoots of Japanese beech trees are closely related to the leaf area soon after full leaf expansion.</p><h3>Abstract</h3><p>To assess the impact of artificially reducing leaf area at two time points after full leaf expansion on the stem xylem hydraulic architecture and conductivity of current-year shoots in <i>Fagus crenata</i>, we manipulated leaf area by partially cutting the leaves in various proportions of potted beech trees at different times. The reduction in leaf area soon after full leaf expansion resulted in a decrease in the mean vessel diameter, number of vessels, and sapwood area of current-year shoots. Simultaneously, it increased vessel density, leading to a proportional decrease in hydraulic conductivity (<i>K</i><sub>h</sub>) and xylem-specific hydraulic conductivity (<i>K</i><sub>S</sub>). However, the leaf-specific hydraulic conductivity (<i>K</i><sub>L</sub>) of current-year shoots remained unchanged, irrespective of the reduction in leaf area. In contrast, the artificial reduction of leaf area one month after full leaf expansion increased <i>K</i><sub>L</sub> but did not significantly affect the mean vessel diameter, number of vessels, vessel density, sapwood area, <i>K</i><sub>h</sub>, and <i>K</i><sub>S</sub>. These results suggest that the stem xylem hydraulic architecture and conductivity of current-year shoots in Japanese beech are closely related to leaf area soon after full leaf expansion.</p></div>","PeriodicalId":805,"journal":{"name":"Trees","volume":"38 2","pages":"483 - 491"},"PeriodicalIF":2.1000,"publicationDate":"2024-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Trees","FirstCategoryId":"2","ListUrlMain":"https://link.springer.com/article/10.1007/s00468-024-02494-w","RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"FORESTRY","Score":null,"Total":0}
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Key message
Hydraulic architecture and conductivity of current-year shoots of Japanese beech trees are closely related to the leaf area soon after full leaf expansion.
Abstract
To assess the impact of artificially reducing leaf area at two time points after full leaf expansion on the stem xylem hydraulic architecture and conductivity of current-year shoots in Fagus crenata, we manipulated leaf area by partially cutting the leaves in various proportions of potted beech trees at different times. The reduction in leaf area soon after full leaf expansion resulted in a decrease in the mean vessel diameter, number of vessels, and sapwood area of current-year shoots. Simultaneously, it increased vessel density, leading to a proportional decrease in hydraulic conductivity (Kh) and xylem-specific hydraulic conductivity (KS). However, the leaf-specific hydraulic conductivity (KL) of current-year shoots remained unchanged, irrespective of the reduction in leaf area. In contrast, the artificial reduction of leaf area one month after full leaf expansion increased KL but did not significantly affect the mean vessel diameter, number of vessels, vessel density, sapwood area, Kh, and KS. These results suggest that the stem xylem hydraulic architecture and conductivity of current-year shoots in Japanese beech are closely related to leaf area soon after full leaf expansion.
期刊介绍：
Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.
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