Plant responses to heterogeneous salinity: Agronomic relevance and research priorities

F.J. Valenzuela; D. Reineke; D. Leventini; C.C.L. Chen; E.G. Barrett-Lennard; T.D. Colmer; I.C. Dodd; S. Shabala; P. Brown; N. Bazihizina

doi:10.1093/aob/mcac022

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Plant responses to heterogeneous salinity: Agronomic relevance and research priorities

Journal article

Peer reviewed

Plant responses to heterogeneous salinity: Agronomic relevance and research priorities

F.J. Valenzuela, D. Reineke, D. Leventini, C.C.L. Chen, E.G. Barrett-Lennard, T.D. Colmer, I.C. Dodd, S. Shabala, P. Brown and N. Bazihizina

Annals of Botany, Vol.129(5), pp.499-518

2022

DOI: https://doi.org/10.1093/aob/mcac022

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Abstract

Background Soil salinity, in both natural and managed environments, is highly heterogeneous, and understanding how plants respond to this spatiotemporal heterogeneity is increasingly important for sustainable agriculture in the era of global climate change. While the vast majority of research on crop response to salinity utilizes homogeneous saline conditions, a much smaller, but important, effort has been made in the past decade to understand plant molecular and physiological responses to heterogeneous salinity mainly by using split-root studies. These studies have begun to unravel how plants compensate for water/nutrient deprivation and limit salt stress by optimizing root-foraging in the most favourable parts of the soil. Scope This paper provides an overview of the patterns of salinity heterogeneity in rain-fed and irrigated systems. We then discuss results from split-root studies and the recent progress in understanding the physiological and molecular mechanisms regulating plant responses to heterogeneous root-zone salinity and nutrient conditions. We focus on mechanisms by which plants (salt/nutrient sensing, root-shoot signalling and water uptake) could optimize the use of less-saline patches within the root-zone, thereby enhancing growth under heterogeneous soil salinity conditions. Finally, we place these findings in the context of defining future research priorities, possible irrigation management and crop breeding opportunities to improve productivity from salt-affected lands.

Details

Title: Plant responses to heterogeneous salinity: Agronomic relevance and research priorities
Authors/Creators: F.J. Valenzuela (Author/Creator) - University of California, Davis
D. Reineke (Author/Creator) - University of California, Davis
D. Leventini (Author/Creator) - University of California, Davis
C.C.L. Chen (Author/Creator) - University of California, Davis
E.G. Barrett-Lennard (Author/Creator) - Department of Primary Industries and Regional Development
T.D. Colmer (Author/Creator) - The University of Western Australia
I.C. Dodd (Author/Creator) - Lancaster University
S. Shabala (Author/Creator) - University of Tasmania
P. Brown (Author/Creator) - University of California, Davis
N. Bazihizina (Author/Creator) - University of Florence
Publication Details: Annals of Botany, Vol.129(5), pp.499-518
Publisher: Oxford University Press
Identifiers: 991005544070407891
Copyright: © 2022 Annals of Botany Company
Murdoch Affiliation: School of Agricultural Sciences
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 3 Agriculture, Environment & Ecology; 3.4 Crop Science; 3.4.49 Plant Stress Responses
Web Of Science research areas: Plant Sciences
ESI research areas: Plant & Animal Science