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Interactions between jasmonates and ethylene in the regulation of root hair development in Arabidopsis

Changhua Zhu, Lijun Gan, Zhenguo Shen and Kai Xia
Journal of Experimental Botany
Vol. 57, No. 6 (2006), pp. 1299-1308
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/24036099
Page Count: 10
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Interactions between jasmonates and ethylene in the regulation of root hair development in Arabidopsis
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Abstract

Root hair formation is an important model with which to study cell patterning and differentiation in higher plants. Ethylene and auxin are critical regulators of root hair development. The role of jasmonates (JAs) was examined in Arabidopsis root hair development as well as their interactions with ethylene in this process. The results have shown that both methyl jasmonate (MeJA) and jasmonic acid (JA) have a pronounced effect on promoting root hair formation. However, the effect of MeJA and JA on root hair formation was blocked by ethylene inhibitors Ag+ or aminoethoxyvinylglycine (AVG). The stimulatory effects of MeJA and JA were also diminished in ethylene-insensitive mutants etr1-1 and etr1-3. Furthermore, the JA biosynthesis inhibitors ibuprofen and salicylhydroxamic acid (SHAM) suppressed 1-aminocyclopropane-1-carboxylic acid (ACC)-induced root hair formation, and decreased the root hairs in seedlings of the ethylene over-producing mutant eto1-1. These results suggested that JAs promote root hair formation, through an interaction with ethylene.

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