Root hydrotropism is controlled via a cortex-specific growth mechanism

Dietrich, Daniela and Pang, Lei and Kobayashi, Akie and Fozard, John A. and Boudolf, Véronique and Bhosale, Rahul and Antoni, Regina and Nguyen, Tuan and Hiratsuka, Sotaro and Fujii, Nobuharu and Miyazawa, Yutaka and Bae, Tae-Woong and Wells, Darren M. and Owen, Markus R. and Band, Leah R. and Dyson, Rosemary J. and Jensen, Oliver E. and King, John R. and Tracy, Saoirse R. and Sturrock, Craig and Mooney, Sacha J. and Roberts, Jeremy A. and Bhalerao, Rishikesh P. and Dinneny, José R. and Rodriguez, Pedro L. and Nagatani, Akira and Hosokawa, Yoichiroh and Baskin, Tobias I. and Pridmore, Tony P. and De Veylder, Lieven and Takahashi, Hideyuki and Bennett, Malcolm J. (2017) Root hydrotropism is controlled via a cortex-specific growth mechanism. Nature Plants, 3 . p. 17057. ISSN 2055-0278

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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.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Biosciences > Division of Plant and Crop Sciences
University of Nottingham, UK > Faculty of Science > School of Computer Science
Identification Number: 10.1038/nplants.2017.57
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Depositing User: Eprints, Support
Date Deposited: 18 May 2017 09:37
Last Modified: 22 May 2017 14:22

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