Temperature gradients assist carbohydrate allocation within trees

Abstract Trees experience two distinct environments: thermally-variable air and thermally-buffered soil. This generates intra-tree temperature gradients, which can affect carbon metabolism and water transport. In this study, we investigated whether carbohydrate allocation within trees is assisted by...

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Autores principales:	Or Sperling, Lucas C. R. Silva, Aude Tixier, Guillaume Théroux-Rancourt, Maciej A. Zwieniecki
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3b4918820cce4671a4da232849dd4483
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spelling	oai:doaj.org-article:3b4918820cce4671a4da232849dd44832021-12-02T15:05:22ZTemperature gradients assist carbohydrate allocation within trees10.1038/s41598-017-03608-w2045-2322https://doaj.org/article/3b4918820cce4671a4da232849dd44832017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03608-whttps://doaj.org/toc/2045-2322Abstract Trees experience two distinct environments: thermally-variable air and thermally-buffered soil. This generates intra-tree temperature gradients, which can affect carbon metabolism and water transport. In this study, we investigated whether carbohydrate allocation within trees is assisted by temperature gradients. We studied pistachio (Pistacia integerrima) to determine: (1) temperature-induced variation in xylem sugar concentration in excised branches; (2) changes in carbon allocation in young trees under simulated spring and fall conditions; and (3) seasonal variability of starch levels in mature orchard trees under field conditions. We found that warm branches had less sugar in perfused sap than cold branches due to increasing parenchyma storage. Simulated spring conditions promoted allocation of carbohydrates from cold roots to warm canopy and explained why starch levels surged in canopies of orchard trees during early spring. This driving force of sugar transport is interrupted in fall when canopies are colder than roots and carbohydrate redistribution is compartmentalized. On the basis of these findings, we propose a new mechanistic model of temperature-assisted carbohydrate allocation that links environmental cues and tree phenology. This data-enabled model provides insights into thermal “fine-tuning” of carbohydrate metabolism and a warning that the physiological performance of trees might be impaired by climatic changes.Or SperlingLucas C. R. SilvaAude TixierGuillaume Théroux-RancourtMaciej A. ZwienieckiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Or Sperling Lucas C. R. Silva Aude Tixier Guillaume Théroux-Rancourt Maciej A. Zwieniecki Temperature gradients assist carbohydrate allocation within trees
description	Abstract Trees experience two distinct environments: thermally-variable air and thermally-buffered soil. This generates intra-tree temperature gradients, which can affect carbon metabolism and water transport. In this study, we investigated whether carbohydrate allocation within trees is assisted by temperature gradients. We studied pistachio (Pistacia integerrima) to determine: (1) temperature-induced variation in xylem sugar concentration in excised branches; (2) changes in carbon allocation in young trees under simulated spring and fall conditions; and (3) seasonal variability of starch levels in mature orchard trees under field conditions. We found that warm branches had less sugar in perfused sap than cold branches due to increasing parenchyma storage. Simulated spring conditions promoted allocation of carbohydrates from cold roots to warm canopy and explained why starch levels surged in canopies of orchard trees during early spring. This driving force of sugar transport is interrupted in fall when canopies are colder than roots and carbohydrate redistribution is compartmentalized. On the basis of these findings, we propose a new mechanistic model of temperature-assisted carbohydrate allocation that links environmental cues and tree phenology. This data-enabled model provides insights into thermal “fine-tuning” of carbohydrate metabolism and a warning that the physiological performance of trees might be impaired by climatic changes.
format	article
author	Or Sperling Lucas C. R. Silva Aude Tixier Guillaume Théroux-Rancourt Maciej A. Zwieniecki
author_facet	Or Sperling Lucas C. R. Silva Aude Tixier Guillaume Théroux-Rancourt Maciej A. Zwieniecki
author_sort	Or Sperling
title	Temperature gradients assist carbohydrate allocation within trees
title_short	Temperature gradients assist carbohydrate allocation within trees
title_full	Temperature gradients assist carbohydrate allocation within trees
title_fullStr	Temperature gradients assist carbohydrate allocation within trees
title_full_unstemmed	Temperature gradients assist carbohydrate allocation within trees
title_sort	temperature gradients assist carbohydrate allocation within trees
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/3b4918820cce4671a4da232849dd4483
work_keys_str_mv	AT orsperling temperaturegradientsassistcarbohydrateallocationwithintrees AT lucascrsilva temperaturegradientsassistcarbohydrateallocationwithintrees AT audetixier temperaturegradientsassistcarbohydrateallocationwithintrees AT guillaumetherouxrancourt temperaturegradientsassistcarbohydrateallocationwithintrees AT maciejazwieniecki temperaturegradientsassistcarbohydrateallocationwithintrees
_version_	1718388822310387712

Temperature gradients assist carbohydrate allocation within trees

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