Photosynthesis adaptation to long- and short-term water restriction in commercial plantlets of Eucalyptus grandis and hybrids with Red Gums

IF 2.1 3区农林科学 Q2 FORESTRY

Trees Pub Date : 2024-03-21 DOI:10.1007/s00468-024-02503-y

Matías Nión, José Gándara, Silvia Ross, María Martha Sainz, Luis Viega

{"title":"Photosynthesis adaptation to long- and short-term water restriction in commercial plantlets of Eucalyptus grandis and hybrids with Red Gums","authors":"Matías Nión, José Gándara, Silvia Ross, María Martha Sainz, Luis Viega","doi":"10.1007/s00468-024-02503-y","DOIUrl":null,"url":null,"abstract":"<div><h3>Key message</h3>Eucalyptus grandis and Red-Gum hybrid plantlets differ in the photosynthetic responses to long and short-term water restriction, leading to different adaptation mechanisms to cope with stress.<h3>Abstract</h3>Eucalypts are the most planted forest species in Uruguay and face frequent drought events, which impact plantlet's establishment. Information needs to be included regarding the behavior of promising clones in such conditions. This work aimed to analyze the effects of short and long-term water restriction (WR) on photosynthetic parameters and whether they enable the plant to cope with water shortage. One clone of Eucalyptus grandis (GG) and interspecific hybrids of E. grandis × E. camaldulensis (GC) and E. grandis × E. tereticornis (GT) were subjected to WR defined by soil water potential. At 6 and 16 weeks after treatment imposition, chlorophyll (%Chl) carotenoids (%Carot), maximum net assimilation rate (Amax), stomatal conductance (gS), leaf transpiration rate (E), light saturation point (LSP) and quantum efficiency (ΦPSII) were assessed. Our results showed that the clones behaved differently. GG minimized water loss significantly to avoid the stress condition through strong stomatal regulation while GC and GT adapted their photosynthetic structure and thus were able to cope with water shortage. Unexpectedly, GT increased Amax significantly under short-term WR, suggesting an early adaptation mechanism to WR. In the long-term WR condition, both hybrids increased %Chl, ΦPSII and Amax while reducing gS and water uptake. These results suggest that Red-Gum hybrids experienced a “priming” effect of a sublethal dose of WR that enabled them to cope with drought stress in the long term.</div>","PeriodicalId":805,"journal":{"name":"Trees","volume":"38 2","pages":"537 - 547"},"PeriodicalIF":2.1000,"publicationDate":"2024-03-21","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/s00468-024-02503-y","RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"FORESTRY","Score":null,"Total":0}

引用次数: 0

Key message

Eucalyptus grandis and Red-Gum hybrid plantlets differ in the photosynthetic responses to long and short-term water restriction, leading to different adaptation mechanisms to cope with stress.

Abstract

Eucalypts are the most planted forest species in Uruguay and face frequent drought events, which impact plantlet's establishment. Information needs to be included regarding the behavior of promising clones in such conditions. This work aimed to analyze the effects of short and long-term water restriction (WR) on photosynthetic parameters and whether they enable the plant to cope with water shortage. One clone of Eucalyptus grandis (GG) and interspecific hybrids of E. grandis × E. camaldulensis (GC) and E. grandis × E. tereticornis (GT) were subjected to WR defined by soil water potential. At 6 and 16 weeks after treatment imposition, chlorophyll (%Chl) carotenoids (%Carot), maximum net assimilation rate (A_max), stomatal conductance (g_S), leaf transpiration rate (E), light saturation point (LSP) and quantum efficiency (ΦPSII) were assessed. Our results showed that the clones behaved differently. GG minimized water loss significantly to avoid the stress condition through strong stomatal regulation while GC and GT adapted their photosynthetic structure and thus were able to cope with water shortage. Unexpectedly, GT increased A_max significantly under short-term WR, suggesting an early adaptation mechanism to WR. In the long-term WR condition, both hybrids increased %Chl, ΦPSII and A_max while reducing g_S and water uptake. These results suggest that Red-Gum hybrids experienced a “priming” effect of a sublethal dose of WR that enabled them to cope with drought stress in the long term.

查看原文本刊更多论文

大叶桉商品小苗及与红胶杂交种对长期和短期限水的光合作用适应性

摘要关键信息大桉树和红胶杂交小苗对长期和短期水分限制的光合作用反应不同，导致应对压力的适应机制不同。摘要桉树是乌拉圭种植最多的森林树种，经常面临干旱，这影响了小植株的生长。我们需要了解有潜力的克隆在这种条件下的表现。这项工作旨在分析短期和长期限水（WR）对光合作用参数的影响，以及它们是否能使植物应对缺水问题。一个克隆的桉树（GG）和桉树 × E. camaldulensis（GC）和桉树 × E. tereticornis（GT）的种间杂交种受到了由土壤水势决定的限水。处理后 6 周和 16 周，对叶绿素（%Chl）、类胡萝卜素（%Carot）、最大净同化率（Amax）、气孔导度（gS）、叶片蒸腾速率（E）、光饱和点（LSP）和量子效率（ΦPSII）进行了评估。结果表明，克隆的表现各不相同。GG 通过强烈的气孔调节，大大减少了水分损失，从而避免了胁迫条件；而 GC 和 GT 则调整了光合结构，从而能够应对水分短缺。出乎意料的是，在短期 WR 条件下，GT 的 Amax 显著增加，这表明了对 WR 的早期适应机制。在长期缺水条件下，两种杂交种都增加了%Chl、ΦPSII和Amax，同时降低了gS和吸水量。这些结果表明，红胶杂交种经历了亚致死剂量 WR 的 "启动 "效应，使其能够长期应对干旱胁迫。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Trees 农林科学-林学

CiteScore

4.50

自引率

4.30%

发文量

113

审稿时长

3.8 months

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.