Premium
ARL1, a LOB‐domain protein required for adventitious root formation in rice
Author(s) -
Liu Hongjia,
Wang Shoufeng,
Yu Xiaobo,
Yu Jie,
He Xiaowei,
Zhang Shelong,
Shou Huixia,
Wu Ping
Publication year - 2005
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/j.1365-313x.2005.02434.x
Subject(s) - root (linguistics) , domain (mathematical analysis) , computer science , biology , mathematics , linguistics , philosophy , mathematical analysis
Summary Adventitious roots constitute the bulk of the fibrous root system in cereals. Compared with the current understanding of shoot development, knowledge of the molecular mechanisms of development of the adventitious roots of cereals is limited. We have isolated and characterized a novel gene controlling the initiation of adventitious root primordia in rice ( Oryza sativa L.). The gene, designated Adventitious rootless1 ( ARL1 ), encodes a protein with a LATERAL ORGAN BOUNDARIES ( LOB ) domain. It is expressed in lateral and adventitious root primordia, tiller primordia, vascular tissues, scutellum, and young pedicels. ARL1 is a nuclear protein and can form homodimers. ARL1 is an auxin‐ and ethylene‐responsive gene, and the expression pattern of ARL1 in roots parallels auxin distribution. Our findings suggest that ARL1 is an auxin‐responsive factor involved in auxin‐mediated cell dedifferentiation, and that it promotes the initial cell division in the pericycle cells adjacent to the peripheral vascular cylinder in the stem.