Rights statement: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Annals of Botany following peer review. The definitive publisher-authenticated version Francisco Jose Valenzuela, Daniela Reineke, Dante Leventini, Christopher Cody Lee Chen, Edward G Barrett-Lennard, Timothy D Colmer, Ian C Dodd, Sergey Shabala, Patrick Brown, Nadia Bazihizina, Plant responses to heterogeneous salinity: agronomic relevance and research priorities, Annals of Botany, 2022, 129, 5: 499-518 is available online at: https://academic.oup.com/aob/article/129/5/499/6529474
Accepted author manuscript, 11.5 MB, PDF document
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Plant responses to heterogeneous salinity
T2 - agronomic relevance and research priorities
AU - Valenzuela, Francisco Jose
AU - Reineke, Daniela
AU - Leventini, Dante
AU - Chen, Christopher Cody Lee
AU - Barrett-Lennard, Edward G
AU - Colmer, Timothy D
AU - Dodd, Ian C
AU - Shabala, Sergey
AU - Brown, Patrick
AU - Bazihizina, Nadia
N1 - This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Annals of Botany following peer review. The definitive publisher-authenticated version Francisco Jose Valenzuela, Daniela Reineke, Dante Leventini, Christopher Cody Lee Chen, Edward G Barrett-Lennard, Timothy D Colmer, Ian C Dodd, Sergey Shabala, Patrick Brown, Nadia Bazihizina, Plant responses to heterogeneous salinity: agronomic relevance and research priorities, Annals of Botany, 2022, 129, 5: 499-518 is available online at: https://academic.oup.com/aob/article/129/5/499/6529474
PY - 2022/4/30
Y1 - 2022/4/30
N2 - 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 utilises homogenous 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 optimising root-foraging in the most favourable parts of the soil. This review 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 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 optimise 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.
AB - 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 utilises homogenous 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 optimising root-foraging in the most favourable parts of the soil. This review 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 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 optimise 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.
KW - nutrient heterogeneity
KW - salt sensing
KW - root foraging
KW - root-to-shoot signalling
KW - stomatal conductance
KW - water uptake
KW - Irrigation
KW - phytohormones
U2 - 10.1093/aob/mcac022
DO - 10.1093/aob/mcac022
M3 - Journal article
C2 - 35171228
VL - 129
SP - 499
EP - 518
JO - Annals of Botany
JF - Annals of Botany
SN - 0305-7364
IS - 5
ER -