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Root hydrotropism is controlled via a cortex-specific growth mechanism

Dietrich, Daniela; Pang, Lei; Kobayashi, Akie; Fozard, John A.; Boudolf, Véronique; Bhosale, Rahul; Antoni, Regina; Nguyen, Tuan; Hiratsuka, Sotaro; Fujii, Nobuharu; Miyazawa, Yutaka; Bae, Tae-Woong; Wells, Darren M.; Owen, Markus R.; Band, Leah R.; Dyson, Rosemary J.; Jensen, Oliver E.; King, John R.; Tracy, Saoirse R.; Sturrock, Craig J.; Mooney, Sacha J.; Roberts, Jeremy A.; Bhalerao, Rishikesh P.; Dinneny, José R.; Rodriguez, Pedro L.; Nagatani, Akira; Hosokawa, Yoichiroh; Baskin, Tobias I.; Pridmore, Tony P.; De Veylder, Lieven; Takahashi, Hideyuki; Bennett, Malcolm J.


Daniela Dietrich

Lei Pang

Akie Kobayashi

John A. Fozard

Véronique Boudolf

Rahul Bhosale

Regina Antoni

Tuan Nguyen

Sotaro Hiratsuka

Nobuharu Fujii

Yutaka Miyazawa

Tae-Woong Bae

Darren M. Wells

Markus R. Owen

Leah R. Band

Rosemary J. Dyson

Oliver E. Jensen

John R. King

Saoirse R. Tracy

Craig J. Sturrock

Sacha J. Mooney

Jeremy A. Roberts

Rishikesh P. Bhalerao

José R. Dinneny

Pedro L. Rodriguez

Akira Nagatani

Yoichiroh Hosokawa

Tobias I. Baskin

Tony P. Pridmore

Lieven De Veylder

Hideyuki Takahashi


Plants can acclimate by using tropisms to link the direction of growth to environmental conditions. Hydrotropism allows roots to forage for water, a process known to depend on abscisic acid (ABA) but whose molecular and cellular basis remains unclear. Here, we show that hydrotropism still occurs in roots after laser ablation removed the meristem and root cap. Additionally, targeted expression studies reveal that hydrotropism depends on the ABA signalling kinase, SnRK2.2, and the hydrotropism-specific MIZ1, both acting specifically in elongation zone cortical cells. Conversely, hydrotropism, but not gravitropism, is inhibited by preventing differential cell-length increases in the cortex, but not in other cell types. We conclude that root tropic responses to gravity and water are driven by distinct tissue-based mechanisms. In addition, unlike its role in root gravitropism, the elongation zone performs a dual function during a hydrotropic response, both sensing a water potential gradient and subsequently undergoing differential growth.

Journal Article Type Article
Publication Date 2017-06
Journal Nature Plants
Print ISSN 2055-026X
Electronic ISSN 2055-0278
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 3
Issue 6
APA6 Citation Dietrich, D., Pang, L., Kobayashi, A., Fozard, J. A., Boudolf, V., Bhosale, R., …Bennett, M. J. (2017). Root hydrotropism is controlled via a cortex-specific growth mechanism. Nature Plants, 3(6),
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Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information Received: 22 June 2016; Accepted: 23 March 2017; First Online: 8 May 2017; : The authors declare no competing financial interests.


Dietrich et al post-print.pdf (8.4 Mb)

Copyright Statement
Copyright information regarding this work can be found at the following address:

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