气候变化领域集成服务门户(CCPortal): Storage of carbon reserves in spruce trees is prioritized over growth in the face of carbon limitation

CCPortal

DOI	10.1073/pnas.2023297118
	Storage of carbon reserves in spruce trees is prioritized over growth in the face of carbon limitation
	Huang J.; Hammerbacher A.; Gershenzon J.; van Dam N.M.; Sala A.; McDowell N.G.; Chowdhury S.; Gleixner G.; Trumbore S.; Hartmann H.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:33
英文摘要	Climate change is expected to pose a global threat to forest health by intensifying extreme events like drought and insect attacks. Carbon allocation is a fundamental process that determines the adaptive responses of long-lived late-maturing organisms like trees to such stresses. However, our mechanistic understanding of how trees coordinate and set allocation priorities among different sinks (e.g., growth and storage) under severe source limitation remains limited. Using flux measurements, isotopic tracing, targeted metabolomics, and transcriptomics, we investigated how limitation of source supply influences sink activity, particularly growth and carbon storage, and their relative regulation in Norway spruce (Picea abies) clones. During photosynthetic deprivation, absolute rates of respiration, growth, and allocation to storage all decline. When trees approach neutral carbon balance, i.e., daytime net carbon gain equals nighttime carbon loss, genes encoding major enzymes of metabolic pathways remain relatively unaffected. However, under negative carbon balance, photosynthesis and growth are down-regulated while sucrose and starch biosynthesis pathways are up-regulated, indicating that trees prioritize carbon allocation to storage over growth. Moreover, trees under negative carbon balance actively increase the turnover rate of starch, lipids, and amino acids, most likely to support respiration and mitigate stress. Our study provides molecular evidence that trees faced with severe photosynthetic limitation strategically regulate storage allocation and consumption at the expense of growth. Understanding such allocation strategies is crucial for predicting how trees may respond to extreme events involving steep declines in photosynthesis, like severe drought, or defoliation by heat waves, late frost, or insect attack. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Carbon allocation; Carbon starvation; Isotopic labeling; Nonstructural carbohydrate storage; Transcriptional regulation
语种	英语
scopus关键词	amino acid; carbon dioxide; lipid; starch; sucrose; Article; carbon allocation; carbon balance; carbon fixation; carbon sink; carbon storage; citric acid cycle; controlled study; glycolysis; isotope labeling; isotope tracing; metabolomics; nonhuman; Norway spruce; photosynthesis; plant growth; transcription regulation; transcriptomics
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238434
作者单位	Department of Biogeochemical Processes, Max Planck Institute for Biogeochemistry, Jena, 07745, Germany; Forestry and Agricultural Biotechnology Institute, Department of Zoology and Entomology, University of Pretoria, Pretoria, 0028, South Africa; Department of Biochemistry, Max Planck Institute for Chemical Ecology, Jena, 07745, Germany; Molecular Interaction Ecology, German Centre for Integrative Biodiversity Research, Leipzig, 04103, Germany; Institute of Biodiversity, Friedrich Schiller University, Jena, 07743, Germany; Division of Biological Sciences, University of Montana, Missoula, MT 59812, United States; Atmospheric Sciences and Global Change, Pacific Northwest National Laboratory, Richland, WA 99354, United States
推荐引用方式 GB/T 7714	Huang J.,Hammerbacher A.,Gershenzon J.,et al. Storage of carbon reserves in spruce trees is prioritized over growth in the face of carbon limitation[J],2021,118(33).
APA	Huang J..,Hammerbacher A..,Gershenzon J..,van Dam N.M..,Sala A..,...&Hartmann H..(2021).Storage of carbon reserves in spruce trees is prioritized over growth in the face of carbon limitation.Proceedings of the National Academy of Sciences of the United States of America,118(33).
MLA	Huang J.,et al."Storage of carbon reserves in spruce trees is prioritized over growth in the face of carbon limitation".Proceedings of the National Academy of Sciences of the United States of America 118.33(2021).