Host: The Japanese Society of Plant Physiologists
Pages 0017
Post-germinative growth of higher plants is critical phase for seedling establishment. Storage reserve in seed is converted to sucrose. Most of energy is used for growth and not used for synthesis of storage reserves during this stage. To identify transcriptional factor that regulate the carbon partition, we screened Arabidopsis mutants that require sucrose for post-germinative growth using a transcriptional factor deficient mutant library produced by CRES-T (Chimeric Repressor Silencing Technology). Analysis of those mutants allowed to identify several transcription factors. We designated these as LOG (low growth). LOG1 is one of the B-box zinc finger genes. Soluble carbohydrate content of log1 mutant was lower that that of WT during post-germinative stage. Moreover, log1 accumulated excess starch. APL3 and 4 expressions in log1 were approximately three fold higher as compared with those in WT. These results suggest that LOG1 regulates carbon partition through down-regulation of APL3 and 4 expressions.
