Carbon dynamics in long-term starving poplar trees—the importance of older carbohydrates and a shift to lipids during survival

Author:

Helm Juliane12ORCID,Muhr Jan134,Hilman Boaz1,Kahmen Ansgar2,Schulze Ernst-Detlef1,Trumbore Susan1,Herrera-Ramírez David1,Hartmann Henrik15ORCID

Affiliation:

1. Max Planck Institute for Biogeochemistry, Department of Biogeochemical Processes , Hans-Knöll-Str.10, Jena 07743 , Germany

2. Department of Environmental Sciences–Botany, University of Basel , Schönbeinstr. 6, Basel CH-4056 , Switzerland

3. Department of Forest Botany and Tree Physiology , Laboratory for Radioisotopes, , Büsgenweg 2, Göttingen 37077 , Germany

4. Georg-August University Göttingen , Laboratory for Radioisotopes, , Büsgenweg 2, Göttingen 37077 , Germany

5. Institute for Forest Protection, Julius Kühn-Institute, Federal Research Centre for Cultivated Plants , Erwin-Baur-Str. 27, Quedlinburg 06484 , Germany

Abstract

Abstract Carbon (C) assimilation can be severely impaired during periods of environmental stress, like drought or defoliation, making trees heavily dependent on the use of C reserve pools for survival; yet, the dynamics of reserve use during periods of reduced C supply are still poorly understood. We used stem girdling in mature poplar trees (Populus tremula L. hybrids), a lipid-storing species, to permanently interrupt the phloem C transport and induced C shortage in the isolated stem section below the girdle and monitored metabolic activity during three campaigns in the growing seasons of 2018, 2019 and 2021. We measured respiratory fluxes (CO2 and O2), non-structural carbon concentration, the respiratory substrate (based on isotopic analysis and CO2/O2 ratio) and the age of the respiratory substrate (based on radiocarbon analysis). Our study shows that poplar trees can survive long periods of reduced C supply from the canopy by switching in metabolism from recent carbohydrates to older storage pools with a potential mixture of respiratory substrates, including lipids. This mechanism of stress resilience can explain why tree decline may take many years before death occurs.

Funder

Max Planck Society and the European Research Council

Publisher

Oxford University Press (OUP)

Subject

Plant Science,Physiology

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3