首页|Interaction among homeodomain transcription factors mediates ethylene biosynthesis during pear fruit ripening
Interaction among homeodomain transcription factors mediates ethylene biosynthesis during pear fruit ripening
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Fruit ripening is manipulated by the plant phytohormone ethylene in climacteric fruits.While the transcription factors(TFs)involved in ethylene biosynthesis and fruit ripening have been extensively studied in tomato,their identification in pear remains limited.In this study,we identified and characterized a HOMEODOMAIN TF,PbHB.G7.2,through transcriptome analysis.PbHB.G7.2 could directly bind to the promoter of the ethylene biosynthetic gene,1-aminocyclopropane-1-carboxylic acid synthase(PbACS1b),thereby enhancing its activity and resulting in increased ethylene production during pear fruit ripening.Yeast-two-hybrid screening revealed that PbHB.G7.2 interacted with PbHB.G1 and PbHB.G2.1.Notably,these interactions disrupted the transcriptional activation of PbHB.G7.2.Interestingly,PbHB.G1 and PbHB.G2.1 also bind to the PbACS1b promoter,albeit different regions from those bound by PbHB.G7.2.Moreover,the regions of PbHB.G1 and PbHB.G2.1 involved in their interaction with PbHB.G7.2 differ from the regions responsible for binding to the PbACS1b promoter.Nonetheless,these interactions also disrupt the transcriptional activation of PbHB.G1 and PbHB.G2.1.These findings offer a new mechanism of ethylene biosynthesis during climacteric fruit ripening.
Jiangsu Engineering Research Center for Pear,State Key Laboratory of Crop Genetics and Germplasm Enhancement,Nanjing Agricultural University,Nanjing 210095,China
State Key Laboratory of Crop Genetics and Germplasm Enhancement,Nanjing Agricultural University,Nanjing 210095,China
Insitute of Pomology,Liaoning Academy of Agricultural Sciences,Yingkou 115009,China
Bioinformatics Center of Nanjing Agricultural UniversityJiangsu seed industry revitalization projectKey Research and Development Program(Modern Agriculture)of Jiangsu ProvinceJiangsu Agricultural Science and Technology Innovation FundEarmarked Fund for China Agriculture Research System
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