Anthocyanins are valuable compounds in red-fleshed apples.The MdMYB10 transcription factor is an important regulator of the anthocyanin synthesis pathway.However,other transcription factors are key components of the c...Anthocyanins are valuable compounds in red-fleshed apples.The MdMYB10 transcription factor is an important regulator of the anthocyanin synthesis pathway.However,other transcription factors are key components of the complex network controlling anthocyanin synthesis and should be more thoroughly characterized.In this study,we used a yeast-based screening technology to identify MdNAC1 as a transcription factor that positively regulates anthocyanin synthesis.The overexpression of MdNAC1 in apple fruits and calli significantly promoted the accumulation of anthocyanins.In binding experiments,we demonstrated that MdNAC1 combines with the bZIP-type transcription factor MdbZIP23 to activate the transcription of MdMYB10 and MdUFGT.Our analyses also indicated that the expression of MdNAC1 is strongly induced by ABA because of the presence of an ABRE cis-acting element in its promoter.Additionally,the accumulation of anthocyanins in apple calli co-transformed with MdNAC1 and MdbZIP23 increased in the presence of ABA.Therefore,we revealed a novel anthocyanin synthesis mechanism involving the ABA-induced transcription factor MdNAC1 in red-fleshed apples.展开更多
基金This study was supported by the Natural Science Foundation of Shandong Province(ZR2020QC144,ZR2022MC017)the National Natural Science Foundation of China(32002002)the Key Research and Develop ment Programs of Shandong Provence(2021LZGC024).
文摘Anthocyanins are valuable compounds in red-fleshed apples.The MdMYB10 transcription factor is an important regulator of the anthocyanin synthesis pathway.However,other transcription factors are key components of the complex network controlling anthocyanin synthesis and should be more thoroughly characterized.In this study,we used a yeast-based screening technology to identify MdNAC1 as a transcription factor that positively regulates anthocyanin synthesis.The overexpression of MdNAC1 in apple fruits and calli significantly promoted the accumulation of anthocyanins.In binding experiments,we demonstrated that MdNAC1 combines with the bZIP-type transcription factor MdbZIP23 to activate the transcription of MdMYB10 and MdUFGT.Our analyses also indicated that the expression of MdNAC1 is strongly induced by ABA because of the presence of an ABRE cis-acting element in its promoter.Additionally,the accumulation of anthocyanins in apple calli co-transformed with MdNAC1 and MdbZIP23 increased in the presence of ABA.Therefore,we revealed a novel anthocyanin synthesis mechanism involving the ABA-induced transcription factor MdNAC1 in red-fleshed apples.
