Journal
NATURE PLANTS
Volume 3, Issue 6, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/nplants.2017.57
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Funding
- Biological and Biotechnology Science Research Council (BBSRC)
- CISB
- European Research Council (ERC) for FUTUREROOTS
- Leverhulme Trust for an Early Career Fellowship
- Research Foundation Flanders [G. 002911N]
- Royal Society for Newton and Wolfson Research Fellowship
- FP7 Marie Curie Fellowship Scheme
- Knut and AliceWallenberg Foundation
- nteruniversity Attraction Poles Programme (MARS) [IUAP P7/29]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan [22120004]
- Japan Society for the Promotion of Science (JSPS) [26870057]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [22120002, 22120010]
- Next-Generation World-Leading Researchers [GS002]
- Japanese government
- Funding Program for Next-Generation World-Leading Researchers [GS002]
- Biotechnology and Biological Sciences Research Council [BB/M019837/1, BB/J009717/1, BB/G023972/1] Funding Source: researchfish
- Engineering and Physical Sciences Research Council [EP/M00015X/1] Funding Source: researchfish
- Grants-in-Aid for Scientific Research [16K07955, 26870057, 17K07433, 22120010] Funding Source: KAKEN
- BBSRC [BB/J009717/1, BB/G023972/1, BB/M019837/1] Funding Source: UKRI
- EPSRC [EP/M00015X/1] Funding Source: UKRI
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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.
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