Root hydrotropism is controlled via a cortex-specific growth mechanism

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. SturrockSacha 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, Malcolm J. Bennett

Research output: Contribution to journalArticlepeer-review

152 Citations (Scopus)


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.

Original languageEnglish
Article number17057
JournalNature Plants
Publication statusPublished - 2017 May 8


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