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Na Yang,Changhua Zhu,Lijun Gan,Denny Ng,Kai Xia 한국식물학회 2011 Journal of Plant Biology Vol.54 No.2
Root hair development is orchestrated by nutritional factors and plant hormones. We investigated the action of ammonium (NH_4^+) and its interactions with methyl jasmonate (MeJA) and ethylene in Arabidopsis root hair growth. The formation of root hair branches was dramatically stimulated in media containing 1.25 to 20 mM NH_4^+ at pH values of 4.0 to 6.5. The NH_4^+ -treated root hairs showed a very short tip growth stage and swells on the sides that indicated the emergence of branches. MeJA (0.08 to 10 μM) worked in synergism with NH_4^+ to enhance hair branching. In contrast, ethylene had an antagonistic effect; the stimulation of hair branching by NH_4^+ was suppressed by the ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC) and was diminished in ethylene-overproducing mutant eto1-1 seedlings. Moreover, the application of Ag^+, an ethylene inhibitor, reduced the ACC-induced inhibition of NH_4^+ -stimulated hair branching and restored NH_4^+ -stimulated hair branching in eto1-1 seedlings. Thus, the actions of jasmonate and ethylene appear to be dependent on nutritional conditions such as available nitrogen