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The FBH family of bHLH transcription factors controls ACC synthase expression in sugarcane
Alessio, Valter Miotto,Cavaç,ana, Natale,Dantas, Luí,za Lane de Barros,Lee, Nayoung,Hotta, Carlos Takeshi,Imaizumi, Takato,Menossi, Marcelo Oxford University Press 2018 Journal of experimental botany Vol.69 No.10
<▼1><P>Identification of transcription factors that control the expression of the sugarcane <I>ACS</I> gene, which is likely involved in ethylene-controlled sucrose accumulation and the circadian regulation of ethylene biosynthesis.</P></▼1><▼2><P><B>Abstract</B></P><P>Ethylene is a phytohormone involved in the regulation of several aspects of plant development and in responses to biotic and abiotic stress. The effects of exogenous application of ethylene to sugarcane plants are well characterized as growth inhibition of immature internodes and stimulation of sucrose accumulation. However, the molecular network underlying the control of ethylene biosynthesis in sugarcane remains largely unknown. The chemical reaction catalyzed by 1-aminocyclopropane-1-carboxylic acid synthase (ACS) is an important rate-limiting step that regulates ethylene production in plants. In this work, using a yeast one-hybrid approach, we identified three basic helix-loop-helix (bHLH) transcription factors, homologs of Arabidopsis FBH (FLOWERING BHLH), that bind to the promoter of <I>ScACS2</I> (Sugarcane <I>ACS2</I>), a sugarcane type 3 ACS isozyme gene. Protein–protein interaction assays showed that sugarcane FBH1 (ScFBH1), ScFBH2, and ScFBH3 form homo- and heterodimers in the nucleus. Gene expression analysis revealed that <I>ScFBHs</I> and <I>ScACS2</I> transcripts are more abundant in maturing internodes during afternoon and night. In addition, Arabidopsis functional analysis demonstrated that FBH controls ethylene production by regulating transcript levels of <I>ACS7</I>, a homolog of <I>ScACS2</I>. These results indicate that ScFBHs transcriptionally regulate ethylene biosynthesis in maturing internodes of sugarcane.</P></▼2>