Plant and Cell Physiology Supplement
Supplement to Plant and Cell Physiology Vol. 49
Conference information

Isolation and Phenotypic Analysis of Novel Mutants Impaired in the Regulation of Seed Dormancy Downstream of FUS3
*Shogo FujitaMichiko KagayaKumiko TsutsumidaAkiko YamamotoTsukaho HattoriYasuaki Kagaya
Author information
CONFERENCE PROCEEDINGS FREE ACCESS

Pages 0626

Details
Abstract
ABA plays important roles in the maintenance of seed dormancy. In Arabidopsis, fus3 mutant seeds fail to undergo dormancy. Several studies have shown that FUS3 positively regulates ABA biosynthesis. However, little is known about the molecular mechanisms underlying this process. To this end, we mutagenized a transgenic line in which ectopic expression of FUS3 could be artificially induced by estrogen and screened for novel mutants defective in FUS3-imposed growth arrest at seedling stages. Among the identified mutants, fga2 showed reduced seed dormancy and resistance to a GA biosynthesis inhibitor, paclobutrazol. Interestingly, the hypocotyls of fga2 seedlings were dramatically elongated when FUS3 was ectopically induced. To further investigate whether FGA2 might act in the regulation of ABA biosynthesis downstream of FUS3, map-based cloning of FGA2 is being carried out. Based on these results, we will discuss possible functions of FGA2 and FUS3 in the regulation of ABA biosynthesis during seed development.
Content from these authors
© 2008 by The Japanese Society of Plant Physiologists
Previous article Next article
feedback
Top