Soil moisture heterogeneity regulates water use in Populus nigra L. by altering root and xylem sap phytohormone concentrations
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Otros documentos de la autoría: Puértolas, Jaime; Pardos, Marta; de Ollas, Carlos; Albacete, Alfonso; Dodd, Ian Charles
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https://doi.org/10.1093/treephys/tpaa037 |
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Título
Soil moisture heterogeneity regulates water use in Populus nigra L. by altering root and xylem sap phytohormone concentrationsFecha de publicación
2020Editor
Oxford University PressISSN
0829-318X; 1758-4469Cita bibliográfica
PUÉRTOLAS, Jaime, et al. Soil moisture heterogeneity regulates water use in Populus nigra L. by altering root and xylem sap phytohormone concentrations. Tree Physiology, 2020, vol. 40, núm. 6, p. 762-773Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://academic.oup.com/treephys/article/40/6/762/5809518Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
Soil moisture heterogeneity in the root zone is common both during the establishment of tree seedlings and in
experiments aiming to impose semi-constant soil moisture deficits, but its effects on regulating plant ... [+]
Soil moisture heterogeneity in the root zone is common both during the establishment of tree seedlings and in
experiments aiming to impose semi-constant soil moisture deficits, but its effects on regulating plant water use compared
with homogenous soil drying are not well known in trees. Pronounced vertical soil moisture heterogeneity was imposed
on black poplar (Populus nigra L.) grown in soil columns by altering irrigation frequency, to test whether plant water
use, hydraulic responses, root phytohormone concentrations and root xylem sap chemical composition differed between
wet (well-watered, WW), and homogeneously (infrequent deficit irrigation, IDI) and heterogeneously dry soil (frequent
deficit irrigation, FDI). At the same bulk soil water content, FDI plants had greater water use than IDI plants, probably
because root abscisic acid (ABA) concentration was low in the upper wetter layer of FDI plants, which maintained root
xylem sap ABA concentration at basal levels in contrast with IDI. Soil drying did not increase root xylem concentration
of any other hormone. Nevertheless, plant-to-plant variation in xylem jasmonic acid (JA) concentration was negatively
related to leaf stomatal conductance within WW and FDI plants. However, feeding detached leaves with high (1200 nM) JA
concentrations via the transpiration stream decreased transpiration only marginally. Xylem pH and sulphate concentration
decreased in FDI plants compared with well-watered plants. Frequent deficit irrigation increased root accumulation of
the cytokinin trans-zeatin (tZ), especially in the dry lower layer, and of the ethylene precursor 1-aminocyclopropane-1-
carboxylic acid (ACC), in the wet upper soil layer. Root hormone accumulation might explain the maintenance of high root
hydraulic conductance and water use in FDI plants (similar to well-watered plants) compared with IDI plants. In irrigated
tree crops, growers could vary irrigation scheduling to control water use by altering the hormone balance. [-]
Publicado en
Tree Physiology, 2020, vol. 40, núm. 6, p. 762-773Entidad financiadora
Ministerio de Educación, Cultura y Deporte | European Union’s Seventh Programme
Código del proyecto o subvención
PR2015-00212 | 311929
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© The Author(s) 2020. Published by Oxford University Press. All rights reserved.
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