Utsuno K, Shikanai T, Yamada Y, Hashimoto T
Graduate School of Biological Sciences, Nara Institute of Science and Technology, Japan.
Plant Cell Physiol. 1998 Oct;39(10):1111-8. doi: 10.1093/oxfordjournals.pcp.a029310.
Mutations in the Agr locus of Arabidopsis thaliana impair the root gravitropic response. Root growth of agr mutants is moderately resistant to ethylene and to an auxin transport inhibitor. Vertically placed agr roots grow into agar medium containing IAA or naphthalene-1-acetic acid, but not into medium containing 2,4-D. Positional cloning showed that AGR encodes a root-specific member of a novel membrane-protein family with limited homology to bacterial transporters.
拟南芥Agr基因座的突变会损害根的向重力性反应。agr突变体的根生长对乙烯和生长素运输抑制剂具有中度抗性。垂直放置的agr根能生长到含有吲哚乙酸（IAA）或萘-1-乙酸的琼脂培养基中，但不能生长到含有2,4-二氯苯氧乙酸（2,4-D）的培养基中。定位克隆表明，AGR编码一个新型膜蛋白家族的根特异性成员，与细菌转运蛋白具有有限的同源性。
