What's happening at IRRI

Seminar: PBGB

Wednesday, April 08, 2015, 02:00pm - 03:00pm


Another story of the MADS box genes
(especially focused on root development and functions)

Dr. Sun-Hyung Kim
Plant Genetic Engineering Laboratory
Department of Environmental Horticulture
University of Seoul, South Korea

1400-1500H, Wednesday, 08 April 2015
Umali Room A


MADS-box genes are key components of the networks that control the transition to flowering and flower development, but their role in vegetative development is poorly understood. This article shows that the sister gene of the AGAMOUS (AG) clade, AGL12, has an important role in root development as well as in flowering transition. Mutant allele for AGL12 isolated. agl12 mutant has a short-root phenotype with a smaller meristem, lower rate of cell production, and abnormal root apical meristem organization. Expression analyses confirmed the presence of AGL12 transcripts in roots, particularly in the phloem. Moreover, AGL12∷β-glucuronidase expression was specifically up-regulated by auxins in this tissue. In addition, mRNA in situ hybridization showed that AGL12 transcripts were also found in leaves and floral meristems of wild-type plants. This expression correlates with the late-flowering phenotypes of the xal1mutants grown under long days. Transcript expression analysis suggests that AGL12 is an upstream regulator of SOC, FLOWERING LOCUS T, and LFY. These results suggested that AGL12 may have similar roles in both root and aerial meristems that could explain the agl12 late-flowering phenotype. In this seminar, I also talk on the AGL14 and AGL19 that control the root development.


Rm A, Umali Bldg