Ethylene modulates genetic, positional, and nutritional regulation of root plagiogravitropism

Functional Plant Biology : FPB
Paramita BasuKathleen M Brown

Abstract

Plagiogravitropic growth of roots strongly affects root architecture and topsoil exploration, which are important for the acquisition of water and nutrients. Here we show that basal roots of Phaseolus vulgaris L. develop from 2-3 definable whorls at the root-shoot interface and exhibit position-dependent plagiogravitropic growth. The whorl closest to the shoot produces the shallowest roots, and lower whorls produce deeper roots. Genotypes vary in both the average growth angles of roots within whorls and the range of growth angles, i.e. the difference between the shallowest and deepest basal roots within a root system. Since ethylene has been implicated in both gravitropic and edaphic stress responses, we studied the role of ethylene and its interaction with phosphorus availability in regulating growth angles of genotypes with shallow or deep basal roots. There was a weak correlation between growth angle and ethylene production in the basal rooting zone, but ethylene sensitivity was strongly correlated with growth angle. Basal roots emerging from the uppermost whorl were more responsive to ethylene treatment than the lower-most whorl, displaying shallower angles and inhibition of growth. Ethylene sensitivity is greater for shall...Continue Reading

References

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Citations

Feb 6, 2020·The New Phytologist·Yafang WangYajun Wu
Sep 6, 2008·Plant, Cell & Environment·Hye-Ji KimKathleen M Brown
Mar 4, 2014·Annual Review of Plant Biology·Damar Lizbeth López-ArredondoLuis Herrera-Estrella
Oct 21, 2015·Frontiers in Plant Science·Li Song, Dong Liu
Apr 25, 2012·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Jonathan P Lynch, Kathleen M Brown
Jun 28, 2011·Plant Signaling & Behavior·Paramita Basu, Anupam Pal
Jul 10, 2018·Annals of Botany·Harini RangarajanJonathan P Lynch
Jan 1, 2017·Theoretical and Experimental Plant Physiology·Jose PolaniaStephen Beebe
Mar 13, 2021·Journal of Integrative Plant Biology·Dong Liu

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