Water Stress in Dwarfing Cherry Rootstocks: Increased Carbon Partitioning to Roots Facilitates Improved Tolerance of Drought

Cherry orchards are transitioning to high-density plantings and dwarfing rootstocks to maximize production, but the response of these rootstocks to drought stress is poorly characterized. We used a 16-container, automated lysimeter system to apply repeated water stress to ungrafted Krymsk<sup>...

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Autores principales:	Will Wheeler, Brent Black, Bruce Bugbee
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	drought tolerance cherry rootstocks gas exchange lysimeter Plant culture SB1-1110
Acceso en línea:	https://doaj.org/article/086f124c91bc4ddb91beb38418d4350f
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spelling	oai:doaj.org-article:086f124c91bc4ddb91beb38418d4350f2021-11-25T17:46:59ZWater Stress in Dwarfing Cherry Rootstocks: Increased Carbon Partitioning to Roots Facilitates Improved Tolerance of Drought10.3390/horticulturae71104242311-7524https://doaj.org/article/086f124c91bc4ddb91beb38418d4350f2021-10-01T00:00:00Zhttps://www.mdpi.com/2311-7524/7/11/424https://doaj.org/toc/2311-7524Cherry orchards are transitioning to high-density plantings and dwarfing rootstocks to maximize production, but the response of these rootstocks to drought stress is poorly characterized. We used a 16-container, automated lysimeter system to apply repeated water stress to ungrafted Krymsk<sup>®</sup> 5 and 6 rootstocks during two growing cycles. Drought stress was imposed by withholding irrigation until the daily transpiration rate of each tree was 25% and 30% of the unstressed rate during the first trial and second trial, respectively. After this point was reached, the root-zone water status was restored to field capacity. Whole-tree transpiration measurements were supplemented with leaf-level gas-exchange measurements. Krymsk<sup>®</sup> 6 had a higher rate of photosynthesis, more vigorous vegetative growth and less conservative stomatal regulation during incipient drought than Krymsk<sup>®</sup> 5. At harvest, carbon partitioning to roots was greater in Krymsk<sup>®</sup> 6 than Krymsk<sup>®</sup> 5. The conservative rate of water use in Krymsk<sup>®</sup> 5 could be a function of greater stomatal control or reduced carbon partitioning to roots, which thereby limited transpiration rates. Further studies are needed to confirm that these results are applicable to trees grown using a common grafted scion under field conditions.Will WheelerBrent BlackBruce BugbeeMDPI AGarticledrought tolerancecherry rootstocksgas exchangelysimeterPlant cultureSB1-1110ENHorticulturae, Vol 7, Iss 424, p 424 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	drought tolerance cherry rootstocks gas exchange lysimeter Plant culture SB1-1110
spellingShingle	drought tolerance cherry rootstocks gas exchange lysimeter Plant culture SB1-1110 Will Wheeler Brent Black Bruce Bugbee Water Stress in Dwarfing Cherry Rootstocks: Increased Carbon Partitioning to Roots Facilitates Improved Tolerance of Drought
description	Cherry orchards are transitioning to high-density plantings and dwarfing rootstocks to maximize production, but the response of these rootstocks to drought stress is poorly characterized. We used a 16-container, automated lysimeter system to apply repeated water stress to ungrafted Krymsk<sup>®</sup> 5 and 6 rootstocks during two growing cycles. Drought stress was imposed by withholding irrigation until the daily transpiration rate of each tree was 25% and 30% of the unstressed rate during the first trial and second trial, respectively. After this point was reached, the root-zone water status was restored to field capacity. Whole-tree transpiration measurements were supplemented with leaf-level gas-exchange measurements. Krymsk<sup>®</sup> 6 had a higher rate of photosynthesis, more vigorous vegetative growth and less conservative stomatal regulation during incipient drought than Krymsk<sup>®</sup> 5. At harvest, carbon partitioning to roots was greater in Krymsk<sup>®</sup> 6 than Krymsk<sup>®</sup> 5. The conservative rate of water use in Krymsk<sup>®</sup> 5 could be a function of greater stomatal control or reduced carbon partitioning to roots, which thereby limited transpiration rates. Further studies are needed to confirm that these results are applicable to trees grown using a common grafted scion under field conditions.
format	article
author	Will Wheeler Brent Black Bruce Bugbee
author_facet	Will Wheeler Brent Black Bruce Bugbee
author_sort	Will Wheeler
title	Water Stress in Dwarfing Cherry Rootstocks: Increased Carbon Partitioning to Roots Facilitates Improved Tolerance of Drought
title_short	Water Stress in Dwarfing Cherry Rootstocks: Increased Carbon Partitioning to Roots Facilitates Improved Tolerance of Drought
title_full	Water Stress in Dwarfing Cherry Rootstocks: Increased Carbon Partitioning to Roots Facilitates Improved Tolerance of Drought
title_fullStr	Water Stress in Dwarfing Cherry Rootstocks: Increased Carbon Partitioning to Roots Facilitates Improved Tolerance of Drought
title_full_unstemmed	Water Stress in Dwarfing Cherry Rootstocks: Increased Carbon Partitioning to Roots Facilitates Improved Tolerance of Drought
title_sort	water stress in dwarfing cherry rootstocks: increased carbon partitioning to roots facilitates improved tolerance of drought
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/086f124c91bc4ddb91beb38418d4350f
work_keys_str_mv	AT willwheeler waterstressindwarfingcherryrootstocksincreasedcarbonpartitioningtorootsfacilitatesimprovedtoleranceofdrought AT brentblack waterstressindwarfingcherryrootstocksincreasedcarbonpartitioningtorootsfacilitatesimprovedtoleranceofdrought AT brucebugbee waterstressindwarfingcherryrootstocksincreasedcarbonpartitioningtorootsfacilitatesimprovedtoleranceofdrought
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Water Stress in Dwarfing Cherry Rootstocks: Increased Carbon Partitioning to Roots Facilitates Improved Tolerance of Drought

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