Abstract

Soil compaction represents a major challenge for modern agriculture. Compaction is intuitively thought to reduce root growth by limiting the ability of roots to penetrate harder soils. We report that root growth in compacted soil is instead actively suppressed by the volatile hormone ethylene. We found that mutant Arabidopsis and rice roots that were insensitive to ethylene penetrated compacted soil more effectively than did wild-type roots. Our results indicate that soil compaction lowers gas diffusion through a reduction in air-filled pores, thereby causing ethylene to accumulate in root tissues and trigger hormone responses that restrict growth. We propose that ethylene acts as an early warning signal for roots to avoid compacted soils, which would be relevant to research into the breeding of crops resilient to soil compaction.
Original languageEnglish
Pages (from-to)276-280
Number of pages5
JournalScience
Volume371
Issue number6526
DOIs
Publication statusPublished - 15 Jan 2021

Bibliographical note

Funding Information:
Supported by Biotechnology and Biological Sciences Research Council (BB/G023972/1, BB/R013748/1, BB/L026848/1, BB/M018431/1, BB/PO16855/1, BB/M001806/1, BB/M012212, and BB/P016855/1); ERC FUTUREROOTS Advanced grant 294729; Future- Food Beacon and Challenge Grant-Royal Society (CHG\R1\170040) (B.K.P.); National Key Technologies Research and Development Program of China, Ministry of Science and Technology grants 2016YFD0100804 and 2016YFE0101000, and National Natural Science Foundation of China grants 31970803 and 31861163002 (D.Z.); China Postdoctoral Science Foundation Project (2019M661486) and Shanghai Post-doctoral Excellent Program (2018063) (G.H.); BBSRC Discovery and Future Food Beacon Nottingham Research Fellowships (R.B.); NWO grant 824.14.007 (S.H.); Saclay Plant Sciences-SPS (ANR-17-EUR-0007) (O.C.M.); Czech Science Foundation (20-25948Y) (M.K.); and the Swedish Foundation for Strategic Research, the Swedish Research Council, and the Knut and Alice Wallenberg Foundation (K.L.).

Publisher Copyright:
© 2021 The Authors, some rights reserved.

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