Abscisic acid regulates root growth under osmotic stress conditions via an interacting hormonal network with cytokinin, ethylene and auxin
Rowe, J.; Topping, J.F.; Liu, J.; Lindsey, K.
Dr Jennifer Topping email@example.com
Dr Junli Liu firstname.lastname@example.org
Senior Research Fellow
Professor Keith Lindsey email@example.com
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.
Rowe, J., Topping, J., Liu, J., & Lindsey, K. (2016). Abscisic acid regulates root growth under osmotic stress conditions via an interacting hormonal network with cytokinin, ethylene and auxin. New Phytologist, 211(1), 225-239. https://doi.org/10.1111/nph.13882
|Journal Article Type||Article|
|Acceptance Date||Jan 6, 2016|
|Online Publication Date||Feb 18, 2016|
|Publication Date||Jul 1, 2016|
|Deposit Date||Jan 7, 2016|
|Publicly Available Date||Jan 18, 2016|
|Peer Reviewed||Peer Reviewed|
Accepted Journal Article
© 2016 The Authors. New Phytologist © 2016 New Phytologist Trust This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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