Sap fluxes from different parts of the rootzone modulate xylem ABA concentration during partial rootzone drying and re-wetting

Lancaster Environment Centre

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https://doi.org/10.1093/jxb/erv029
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Keywords

ABA, irrigation scheduling, partial rootzone drying, root-to-shoot signalling, soil moisture sensors, soil moisture heterogeneity, WATER-USE EFFICIENCY, DEFICIT IRRIGATION, ABSCISIC-ACID, ZONE IRRIGATION, SOIL-MOISTURE, STOMATAL CONDUCTANCE, PLANTS, TOMATO, LEAVES, TRANSPIRATION

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Sap fluxes from different parts of the rootzone modulate xylem ABA concentration during partial rootzone drying and re-wetting. / Perez-Perez, J. G.; Dodd, I. C.
In: Journal of Experimental Botany, Vol. 66, No. 8, 04.2015, p. 2315-2324.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Bibtex

@article{e01bc5cd483f4accb3b9787b3d8b7622,

title = "Sap fluxes from different parts of the rootzone modulate xylem ABA concentration during partial rootzone drying and re-wetting",

abstract = "Previous studies with partial rootzone drying (PRD) irrigation demonstrated that alternating the wet and dry parts of the rootzone (PRD-Alternated) increased leaf xylem ABA concentration ([X-ABA](leaf)) compared with maintaining the same wet and dry parts of the rootzone (PRD-Fixed). To determine the relative contributions of different parts of the rootzone to this ABA signal, [X-ABA](leaf) of potted, split-root tomato (Solanum lycopersicum) plants was modelled by quantifying the proportional water uptake from different soil compartments, and [X-ABA](leaf) responses to the entire pot soil-water content (theta(pot)). Continuously measuring soil-moisture depletion by, or sap fluxes from, different parts of the root system revealed that water uptake rapidly declined (within hours) after withholding water from part of the rootzone, but was rapidly restored (within minutes) upon re-watering. Two hours after re-watering part of the rootzone, [X-ABA](leaf) was equally well predicted according to sigma(pot) alone and by accounting for the proportional water uptake from different parts of the rootzone. Six hours after re-watering part of the rootzone, water uptake by roots in drying soil was minimal and, instead, occurred mainly from the newly irrigated part of the rootzone, thus [X-ABA](leaf) was best predicted by accounting for the proportional water uptake from different parts of the rootzone. Contrary to previous results, alternating the wet and dry parts of the rootzone did not enhance [X-ABA](leaf) compared with PRD-Fixed irrigation. Further work is required to establish whether altered root-to-shoot ABA signalling contributes to the improved yields of crops grown with alternate, rather than fixed, PRD.",

keywords = "ABA, irrigation scheduling, partial rootzone drying, root-to-shoot signalling, soil moisture sensors, soil moisture heterogeneity, WATER-USE EFFICIENCY, DEFICIT IRRIGATION, ABSCISIC-ACID, ZONE IRRIGATION, SOIL-MOISTURE, STOMATAL CONDUCTANCE, PLANTS, TOMATO, LEAVES, TRANSPIRATION",

author = "Perez-Perez, {J. G.} and Dodd, {I. C.}",

year = "2015",

month = apr,

doi = "10.1093/jxb/erv029",

language = "English",

volume = "66",

pages = "2315--2324",

journal = "Journal of Experimental Botany",

issn = "0022-0957",

publisher = "OXFORD UNIV PRESS",

number = "8",

}

RIS

TY - JOUR

T1 - Sap fluxes from different parts of the rootzone modulate xylem ABA concentration during partial rootzone drying and re-wetting

AU - Perez-Perez, J. G.

AU - Dodd, I. C.

PY - 2015/4

Y1 - 2015/4

N2 - Previous studies with partial rootzone drying (PRD) irrigation demonstrated that alternating the wet and dry parts of the rootzone (PRD-Alternated) increased leaf xylem ABA concentration ([X-ABA](leaf)) compared with maintaining the same wet and dry parts of the rootzone (PRD-Fixed). To determine the relative contributions of different parts of the rootzone to this ABA signal, [X-ABA](leaf) of potted, split-root tomato (Solanum lycopersicum) plants was modelled by quantifying the proportional water uptake from different soil compartments, and [X-ABA](leaf) responses to the entire pot soil-water content (theta(pot)). Continuously measuring soil-moisture depletion by, or sap fluxes from, different parts of the root system revealed that water uptake rapidly declined (within hours) after withholding water from part of the rootzone, but was rapidly restored (within minutes) upon re-watering. Two hours after re-watering part of the rootzone, [X-ABA](leaf) was equally well predicted according to sigma(pot) alone and by accounting for the proportional water uptake from different parts of the rootzone. Six hours after re-watering part of the rootzone, water uptake by roots in drying soil was minimal and, instead, occurred mainly from the newly irrigated part of the rootzone, thus [X-ABA](leaf) was best predicted by accounting for the proportional water uptake from different parts of the rootzone. Contrary to previous results, alternating the wet and dry parts of the rootzone did not enhance [X-ABA](leaf) compared with PRD-Fixed irrigation. Further work is required to establish whether altered root-to-shoot ABA signalling contributes to the improved yields of crops grown with alternate, rather than fixed, PRD.

AB - Previous studies with partial rootzone drying (PRD) irrigation demonstrated that alternating the wet and dry parts of the rootzone (PRD-Alternated) increased leaf xylem ABA concentration ([X-ABA](leaf)) compared with maintaining the same wet and dry parts of the rootzone (PRD-Fixed). To determine the relative contributions of different parts of the rootzone to this ABA signal, [X-ABA](leaf) of potted, split-root tomato (Solanum lycopersicum) plants was modelled by quantifying the proportional water uptake from different soil compartments, and [X-ABA](leaf) responses to the entire pot soil-water content (theta(pot)). Continuously measuring soil-moisture depletion by, or sap fluxes from, different parts of the root system revealed that water uptake rapidly declined (within hours) after withholding water from part of the rootzone, but was rapidly restored (within minutes) upon re-watering. Two hours after re-watering part of the rootzone, [X-ABA](leaf) was equally well predicted according to sigma(pot) alone and by accounting for the proportional water uptake from different parts of the rootzone. Six hours after re-watering part of the rootzone, water uptake by roots in drying soil was minimal and, instead, occurred mainly from the newly irrigated part of the rootzone, thus [X-ABA](leaf) was best predicted by accounting for the proportional water uptake from different parts of the rootzone. Contrary to previous results, alternating the wet and dry parts of the rootzone did not enhance [X-ABA](leaf) compared with PRD-Fixed irrigation. Further work is required to establish whether altered root-to-shoot ABA signalling contributes to the improved yields of crops grown with alternate, rather than fixed, PRD.

KW - ABA

KW - irrigation scheduling

KW - partial rootzone drying

KW - root-to-shoot signalling

KW - soil moisture sensors

KW - soil moisture heterogeneity

KW - WATER-USE EFFICIENCY

KW - DEFICIT IRRIGATION

KW - ABSCISIC-ACID

KW - ZONE IRRIGATION

KW - SOIL-MOISTURE

KW - STOMATAL CONDUCTANCE

KW - PLANTS

KW - TOMATO

KW - LEAVES

KW - TRANSPIRATION

U2 - 10.1093/jxb/erv029

DO - 10.1093/jxb/erv029

M3 - Journal article

VL - 66

SP - 2315

EP - 2324

JO - Journal of Experimental Botany

JF - Journal of Experimental Botany

SN - 0022-0957

IS - 8

ER -

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