Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Hormonal regulation of source-sink relations to maintain crop productivity under salinity
T2 - a case study of root-to-shoot signalling in tomato
AU - Perez-Alfocea, Francisco
AU - Albacete, Alfonso
AU - Ghanem, Michel E.
AU - Dodd, Ian C.
PY - 2010
Y1 - 2010
N2 - Salinity decreases crop yield first by reducing growth of assimilate-consuming sink organs and, second, by decreasing assimilate production in photosynthetically active source tissues. Although much work has focussed on controlling the accumulation of toxic ions (mainly Na+ and Cl-), the search for primary growth limiting factor(s) continues. The root, by sensing environmental constraints of the soil, may influence root-to-shoot signalling to control shoot growth and physiology, and ultimately agricultural productivity. Hormonal signals, such as cytokinins, ABA, the ethylene precursor 1-aminocyclopropane-1-carboxylic acid and the auxin indole-3-acetic acid may coordinate assimilate production and usage in competing sinks (biomass partitioning). Hormonal regulation of source-sink relations during the osmotic phase of salinity (independent of specific ions) affects whole-plant energy availability to prolong the maintenance of growth, root function and ion homeostasis, and could be critical to delay the accumulation of Na+ or any other ion to toxic levels. This viewpoint emphasises that simultaneously maintaining growth and delaying early leaf senescence is necessary to increase crop yield in salt-affected soils.
AB - Salinity decreases crop yield first by reducing growth of assimilate-consuming sink organs and, second, by decreasing assimilate production in photosynthetically active source tissues. Although much work has focussed on controlling the accumulation of toxic ions (mainly Na+ and Cl-), the search for primary growth limiting factor(s) continues. The root, by sensing environmental constraints of the soil, may influence root-to-shoot signalling to control shoot growth and physiology, and ultimately agricultural productivity. Hormonal signals, such as cytokinins, ABA, the ethylene precursor 1-aminocyclopropane-1-carboxylic acid and the auxin indole-3-acetic acid may coordinate assimilate production and usage in competing sinks (biomass partitioning). Hormonal regulation of source-sink relations during the osmotic phase of salinity (independent of specific ions) affects whole-plant energy availability to prolong the maintenance of growth, root function and ion homeostasis, and could be critical to delay the accumulation of Na+ or any other ion to toxic levels. This viewpoint emphasises that simultaneously maintaining growth and delaying early leaf senescence is necessary to increase crop yield in salt-affected soils.
KW - biphasic model
KW - cytokinins
KW - invertases
KW - ion-specific effects
KW - osmotic tolerance
KW - senescence.
KW - SOLANUM-LYCOPERSICON L.
KW - DELAYED LEAF SENESCENCE
KW - SALT-TOLERANCE
KW - OSMOTIC-STRESS
KW - ABSCISIC-ACID
KW - PLANT-GROWTH
KW - DRYING SOIL
KW - DURUM-WHEAT
KW - CYTOKININS
KW - NA+
U2 - 10.1071/FP10012
DO - 10.1071/FP10012
M3 - Journal article
VL - 37
SP - 592
EP - 603
JO - Functional Plant Biology
JF - Functional Plant Biology
SN - 1445-4408
IS - 7
ER -