Abscisic acid regulates root growth under osmotic stress conditions via an interacting hormonal network with cytokinin, ethylene and auxin
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TL;DR: Analysis of the effect of osmotic stress on abscisic acid, cytokinin and ethylene responses and how they mediate auxin transport, distribution and root growth through effects on PIN proteins reveals that ABA regulates root growth under osmosis stress conditions via an interacting hormonal network with cytokin in, ethylene and auxin.
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Abstract: Understanding the mechanisms regulating root development under drought conditions is an important question for plant biology and world agriculture. We examine the effect of osmotic stress on abscisic acid (ABA), cytokinin and ethylene responses and how they mediate auxin transport, distribution and root growth through effects on PIN proteins. We integrate experimental data to construct hormonal crosstalk networks to formulate a systems view of root growth regulation by multiple hormones. Experimental analysis shows: that ABA-dependent and ABA-independent stress responses increase under osmotic stress, but cytokinin responses are only slightly reduced; inhibition of root growth under osmotic stress does not require ethylene signalling, but auxin can rescue root growth and meristem size; osmotic stress modulates auxin transporter levels and localization, reducing root auxin concentrations; PIN1 levels are reduced under stress in an ABA-dependent manner, overriding ethylene effects; and the interplay among ABA, ethylene, cytokinin and auxin is tissue-specific, as evidenced by differential responses of PIN1 and PIN2 to osmotic stress. Combining experimental analysis with network construction reveals that ABA regulates root growth under osmotic stress conditions via an interacting hormonal network with cytokinin, ethylene and auxin.
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Citations
Plant hormone regulation of abiotic stress responses
Rainer Waadt,Charles A. Seller,Po-Kai Hsu,Yohei Takahashi,Shintaro Munemasa,Julian I. Schroeder +5 more
TL;DR: Shroeder et al. as mentioned in this paper discuss recent advances in understanding how diverse plant hormones control abiotic stress responses in plants and highlight points of hormonal crosstalk during stress signalling.
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Roots withstanding their environment : Exploiting root system architecture responses to abiotic stress to improve crop tolerance
TL;DR: It is suggested that functional evidence on the role of root plasticity will support breeders in their efforts to include root properties in their current selection pipeline for abiotic stress tolerance, aimed to improve the robustness of crops.
Phytohormones enhanced drought tolerance in plants: a coping strategy.
Abid Ullah,Hakim Manghwar,Muhammad Shaban,Aamir Hamid Khan,Adnan Akbar,Usman Ali,Ehsan Ali,Shah Fahad +7 more
TL;DR: The present review highlights the regulatory circuits of phytohormones in drought tolerance mechanism and considers the main hormone which intensifies drought tolerance in plants through various morpho-physiological and molecular processes including stomata regulation, root development, and initiation of ABA-dependent pathway.
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The Role and Regulation of ABI5 (ABA-Insensitive 5) in Plant Development, Abiotic Stress Responses and Phytohormone Crosstalk
TL;DR: Recent advances in understanding the action of ABI5 in early developmental processes and the adaptation of plants to unfavorable environmental conditions are described and monocot orthologs of AtABI5 have been identified.
Plant growth‐promoting rhizobacteria enhance wheat salt and drought stress tolerance by altering endogenous phytohormone levels and TaCTR1/TaDREB2 expression
Deepti Barnawal,Deepti Barnawal,Nidhi Bharti,Nidhi Bharti,Shiv Shanker Pandey,Alok Pandey,Chandan S. Chanotiya,Alok Kalra +7 more
TL;DR: Results suggest that PGPR strains, Arthrobacter protophormiae (SA3) and Dietzia natronolimnaea (STR1), can facilitate salt stress tolerance in wheat crop, while Bacillus subtilis (LDR2) can provide tolerance against drought stress in wheat.
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