The PERIANTHIA gene encodes a bZIP protein involved in the determination of floral organ number in Arabidopsis thaliana

AUTOR(ES)

Chuang, Chiou-Fen

FONTE

Cold Spring Harbor Laboratory Press

RESUMO

Mutations in the PERIANTHIA (PAN) gene of Arabidopsis thaliana specifically transform flowers from tetramerous to largely pentamerous, which is a characteristic of flowers of ancestral plants. We have cloned the PAN gene and here we show that it encodes a member of the basic region/leucine zipper class of transcription factors. Immunohistochemical analysis shows that the encoded protein is present in the apical meristem, the floral meristem, each whorl of organ primordia, and in ovule primordia during wild-type flower development. PAN expression occurs independently of genes affecting floral meristem identity, floral meristem size, or floral organ number. The near absence of a phenotype in transgenic plants overexpressing PAN and the contrast between the broad expression of PAN and the specificity of its mutant phenotype suggest that its activity may be regulated post-translationally or by the presence of partner proteins. Based on these results and on data reported previously, we propose models for the role of PAN in the evolution of flower pattern in the mustard family.

Documentos Relacionados

• Dual roles of the bZIP transcription factor PERIANTHIA in the control of floral architecture and homeotic gene expression
• The Arabidopsis HY5 gene encodes a bZIP protein that regulates stimulus-induced development of root and hypocotyl
• Dimerization specificity of all 67 B-ZIP motifs in Arabidopsis thaliana: a comparison to Homo sapiens B-ZIP motifs
• Analise funcional do regulador de transcrição do tipo bZIP AtbZIP9 de Arabidopsis thaliana atraves da superexpressão de seus genes alvos
• Yeast SKO1 gene encodes a bZIP protein that binds to the CRE motif and acts as a repressor of transcription.