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. 2012 Feb 21;7(2):e31325. doi: 10.1371/journal.pone.0031325

Figure 8. A model for grain length control by PGL1 and APG in rice.

Figure 8

A) APG is a transcriptional activator of the cell elongation suppressor gene in rice lemma/palea. APG forms homodimer or heterodimer with unidentified typical bHLH (not shown). Overexpression of PGL1 abolished the function of APG and suppressed the target gene expression allowing the cell to elongate (in the PGL1:OX line). Silencing of APG repressed the target gene expression and resulted in cell elongation (in the APG RNAi line). B) APG is a transcriptional repressor of the cell elongation activator gene in rice lemma/palea. APG forms homodimer or heterodimer with unidentified typical bHLH (not shown). In contrast to (a), the APG target gene promotes cell elongation and its function is repressed by APG in the wild type but activated in PGL1:OX and APG RNAi, allowing the cells to elongate in the lemma/palea.