Auxin and ethylene promote root hair elongation in Arabidopsis
Auxin and ethylene promote root hair elongation in Arabidopsis
复制标题
DOI：
10.1046/j.1365-313x.1998.00321.x
复制
发表时间：
1998-12-01
期刊：
影响因子：
7.2
通讯作者：
Estelle, M
中科院分区：
文献类型：
--
作者：
Pitts, RJ;Cernac, A;Estelle, M
遗传和生理研究表明植物激素生长素和乙烯参与根毛的发育。为了进一步了解这些化合物的作用，我们研究了一些生长素和乙烯相关突变体的根毛表型。在以前的研究中，Masucci和Schiefelbein（1996）表明，无论是生长素反应突变aux 1和axr 1，还是乙烯反应突变etr 1和ein 2，都对根毛的发生没有显著影响。在这项研究中，我们发现无论是生长素或乙烯反应缺陷突变体有显着的影响，根毛长度。野生型，axr 1和etr 1幼苗与合成生长素，2，4-D，或乙烯前体ACC的治疗，导致比未处理的幼苗更长的根毛的发展。此外，axr 1幼苗生长在ACC的存在下产生异位根毛和一个不寻常的模式，长根毛其次是地区，完全缺乏根毛。这些研究表明，生长素和乙烯都是正常根毛伸长所必需的。
Genetic and physiological studies implicate the phytohormones auxin and ethylene in root hair development. To learn more about the role of these compounds, we have examined the root hair phenotype of a number of auxin- and ethylene-related mutants. In a previous study, Masucci and Schiefelbein (1996) showed that neither the auxin response mutations aux1 and axr1 nor the ethylene response mutations etr1 and ein2 have a significant effect on root hair initiation. In this study, we found that mutants deficient in either auxin or ethylene response have a pronounced effect on root hair length. Treatment of wildtype, axr1 and etr1 seedlings with the synthetic auxin, 2,4-D, or the ethylene precursor ACC, led to the development of longer root hairs than untreated seedlings. Furthermore, axr1 seedlings grown in the presence of ACC produce ectopic root hairs and an unusual pattern of long root hairs followed by regions that completely lack root hairs. These studies indicate that both auxin and ethylene are required for normal root hair elongation.