Compensatory hydraulic uptake of water by tomato due to variable root‐zone salinity

Abstract Plant root systems are exposed to spatial and temporal heterogeneity regarding water availability. In the long‐term, compensation, increased uptake by roots in areas with favorable conditions in response to decreased uptake in areas under stress, is driven by root growth and distribution. I...

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Autores principales:	D. Tzohar, M. Moshelion, A. Ben‐Gal
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	Environmental sciences GE1-350 Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/3918dd053b40468d8f1269223ff7e398
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spelling	oai:doaj.org-article:3918dd053b40468d8f1269223ff7e3982021-11-25T13:30:33ZCompensatory hydraulic uptake of water by tomato due to variable root‐zone salinity1539-166310.1002/vzj2.20161https://doaj.org/article/3918dd053b40468d8f1269223ff7e3982021-11-01T00:00:00Zhttps://doi.org/10.1002/vzj2.20161https://doaj.org/toc/1539-1663Abstract Plant root systems are exposed to spatial and temporal heterogeneity regarding water availability. In the long‐term, compensation, increased uptake by roots in areas with favorable conditions in response to decreased uptake in areas under stress, is driven by root growth and distribution. In the short‐term (hours–days), compensative processes are less understood. We hypothesized hydraulic compensation where local lowered water availability is accompanied by increased uptake from areas where water remains available. Our objective was to quantify instantaneous hydraulic root uptake under conditions of differential water availability. Tomato (Solanum lycopersicum L.) plants were grown in split‐root weighing‐drainage lysimeters in which each half of the roots could alternatively be exposed to short‐term conditions of salinity. Uptake was quantified from each of the two root zone compartments. One‐sided exposure to salinity immediately led to less uptake from the salt‐affected compartment and increased uptake from the nontreated compartment. Compensation occurred at salinity, caused by NaCl solution of 4 dS m−1, that did not decrease uptake in plants with entire root systems exposed. At higher salinity, 6.44 dS m−1, transpiration decreased by ∼50% when the total root system was exposed. When only half of the roots were exposed, total uptake was maintained at levels of nonstressed plants with as much as 85% occurring from the nontreated compartment. The extent of compensation was not absolute and apparently a function of salinity, atmospheric demand, and duration of exposure. As long as there is no hydraulic restriction in other areas, temporary reduction in water availability in some parts of a tomato's root zone will not affect plant‐scale transpiration.D. TzoharM. MoshelionA. Ben‐GalWileyarticleEnvironmental sciencesGE1-350GeologyQE1-996.5ENVadose Zone Journal, Vol 20, Iss 6, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Environmental sciences GE1-350 Geology QE1-996.5
spellingShingle	Environmental sciences GE1-350 Geology QE1-996.5 D. Tzohar M. Moshelion A. Ben‐Gal Compensatory hydraulic uptake of water by tomato due to variable root‐zone salinity
description	Abstract Plant root systems are exposed to spatial and temporal heterogeneity regarding water availability. In the long‐term, compensation, increased uptake by roots in areas with favorable conditions in response to decreased uptake in areas under stress, is driven by root growth and distribution. In the short‐term (hours–days), compensative processes are less understood. We hypothesized hydraulic compensation where local lowered water availability is accompanied by increased uptake from areas where water remains available. Our objective was to quantify instantaneous hydraulic root uptake under conditions of differential water availability. Tomato (Solanum lycopersicum L.) plants were grown in split‐root weighing‐drainage lysimeters in which each half of the roots could alternatively be exposed to short‐term conditions of salinity. Uptake was quantified from each of the two root zone compartments. One‐sided exposure to salinity immediately led to less uptake from the salt‐affected compartment and increased uptake from the nontreated compartment. Compensation occurred at salinity, caused by NaCl solution of 4 dS m−1, that did not decrease uptake in plants with entire root systems exposed. At higher salinity, 6.44 dS m−1, transpiration decreased by ∼50% when the total root system was exposed. When only half of the roots were exposed, total uptake was maintained at levels of nonstressed plants with as much as 85% occurring from the nontreated compartment. The extent of compensation was not absolute and apparently a function of salinity, atmospheric demand, and duration of exposure. As long as there is no hydraulic restriction in other areas, temporary reduction in water availability in some parts of a tomato's root zone will not affect plant‐scale transpiration.
format	article
author	D. Tzohar M. Moshelion A. Ben‐Gal
author_facet	D. Tzohar M. Moshelion A. Ben‐Gal
author_sort	D. Tzohar
title	Compensatory hydraulic uptake of water by tomato due to variable root‐zone salinity
title_short	Compensatory hydraulic uptake of water by tomato due to variable root‐zone salinity
title_full	Compensatory hydraulic uptake of water by tomato due to variable root‐zone salinity
title_fullStr	Compensatory hydraulic uptake of water by tomato due to variable root‐zone salinity
title_full_unstemmed	Compensatory hydraulic uptake of water by tomato due to variable root‐zone salinity
title_sort	compensatory hydraulic uptake of water by tomato due to variable root‐zone salinity
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/3918dd053b40468d8f1269223ff7e398
work_keys_str_mv	AT dtzohar compensatoryhydraulicuptakeofwaterbytomatoduetovariablerootzonesalinity AT mmoshelion compensatoryhydraulicuptakeofwaterbytomatoduetovariablerootzonesalinity AT abengal compensatoryhydraulicuptakeofwaterbytomatoduetovariablerootzonesalinity
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Compensatory hydraulic uptake of water by tomato due to variable root‐zone salinity

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