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Mohanty, Bijayalaxmi,Takahashi, Hirokazu,de los Reyes, Benildo G.,Wijaya, Edward,Nakazono, Mikio,Lee, Dong-Yup Springer US 2016 Rice Vol.9 No.1
<P><B>Background</B></P><P>Rice is the only crop that germinates and elongates the coleoptile under complete submergence. It has been shown that <I>alcohol dehydrogenase 1 (ADH1)-</I>deficient mutant of rice with <I>reduced alcohol dehydrogenase activity</I> (<I>rad</I>) and reduced ATP level, is viable with much reduced coleoptile elongation under such condition. To understand the altered transcriptional regulatory mechanism of this mutant, we aimed to establish possible relationships between gene expression and <I>cis</I>-regulatory information content.</P><P><B>Findings</B></P><P>We performed promoter analysis of the publicly available differentially expressed genes in <I>ADH1</I> mutant. Our results revealed that a crosstalk between a number of key transcription factors (TFs) and different phytohormones altered transcriptional regulation leading to the survival of the mutant. Amongst the key TFs identified, we suggest potential involvement of MYB, bZIP, ARF and ERF as transcriptional activators and WRKY, ABI4 and MYC as transcriptional repressors of coleoptile elongation to maintain metabolite levels for the cell viability. Out of the repressors, WRKY TF is most likely playing a major role in the alteration of the physiological implications associated with the cell survival.</P><P><B>Conclusions</B></P><P>Overall, our analysis provides a possible transcriptional regulatory mechanism underlying the survival of the <I>rad</I> mutant under complete submergence in an energy crisis condition and develops hypotheses for further experimental validation.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1186/s12284-016-0124-3) contains supplementary material, which is available to authorized users.</P>