PbAGL7-PbNAC47-PbMYB73 complex coordinately regulates PbC3H1 and PbHCT17 to promote the lignin biosynthesis in stone cells of pear fruit.

IF 6.2 1区 生物学 Q1 PLANT SCIENCES The Plant Journal Pub Date : 2024-10-24 DOI:10.1111/tpj.17090
Xin Gong, Kaijie Qi, Liangyi Zhao, Zhihua Xie, Jiahui Pan, Xin Yan, Katsuhiro Shiratake, Shaoling Zhang, Shutian Tao
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Abstract

Lignification of the cell wall in pear (Pyrus) fruit results in the formation of stone cells, which affects the texture and quality of the fruit. However, it is still unclear that how different transcription factors (TFs) work together to coordinate the synthesis and deposition of lignin. Here, we examined the transcriptome of pear varieties with different stone cell contents and found a key TF (PbAGL7) that can promote the increase of stone cell contents and secondary cell wall thicknesses. In addition, PbAGL7 can facilitate the expression level of lignin biosynthesis-related genes and accelerate the lignin biosynthesis in pear fruit and Arabidopsis. However, PbAGL7 did not directly bind to the promoters of PbC3H1 and PbHCT17 which are crucial genes involved in lignin biosynthesis. On the other hand, yeast two-hybrid (Y2H) library showed that PbNAC47 and PbMYB73 interacted with PbAGL7 in the nucleus. PbNAC47 and PbMYB73 also increased the stone cell and lignin contents, and upregulated the expressions of PbC3H1 and PbHCT17 by binding to the SNBE and AC elements, respectively. Moreover, PbNAC47 also interacted with PbMYB73 to form PbAGL7-PbNAC47-PbMYB73 complex. This complex significantly activated the expression levels of PbC3H1 and PbHCT17 and promoted lignin biosynthesis to form stone cells in pear fruit. Overall, our study provides new insights into the molecular mechanism of TFs that coordinately regulate the stone cell formation in pear fruit and extend our knowledge to understand cell wall lignification in plants.

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PbAGL7-PbNAC47-PbMYB73 复合物协调调控 PbC3H1 和 PbHCT17,促进梨果核细胞中木质素的生物合成。
梨(Pyrus)果实细胞壁的木质化会导致结石细胞的形成,从而影响果实的质地和品质。然而,不同的转录因子(TFs)如何共同协调木质素的合成和沉积仍不清楚。在此,我们研究了不同结石细胞含量的梨品种的转录组,发现了一个关键的转录因子(PbAGL7),它能促进结石细胞含量和次生细胞壁厚度的增加。此外,PbAGL7 还能促进木质素生物合成相关基因的表达水平,加速梨果和拟南芥中木质素的生物合成。然而,PbAGL7 并不直接与参与木质素生物合成的关键基因 PbC3H1 和 PbHCT17 的启动子结合。另一方面,酵母双杂交(Y2H)文库显示,PbNAC47 和 PbMYB73 在细胞核中与 PbAGL7 相互作用。PbNAC47 和 PbMYB73 还增加了石细胞和木质素的含量,并分别通过与 SNBE 和 AC 元素结合上调了 PbC3H1 和 PbHCT17 的表达。此外,PbNAC47 还与 PbMYB73 相互作用,形成 PbAGL7-PbNAC47-PbMYB73 复合物。该复合物能明显激活 PbC3H1 和 PbHCT17 的表达水平,促进木质素的生物合成,从而在梨果中形成结石细胞。总之,我们的研究对协调调控梨果石细胞形成的 TFs 分子机制提供了新的见解,并扩展了我们对植物细胞壁木质化的认识。
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来源期刊
The Plant Journal
The Plant Journal 生物-植物科学
CiteScore
13.10
自引率
4.20%
发文量
415
审稿时长
2.3 months
期刊介绍: Publishing the best original research papers in all key areas of modern plant biology from the world"s leading laboratories, The Plant Journal provides a dynamic forum for this ever growing international research community. Plant science research is now at the forefront of research in the biological sciences, with breakthroughs in our understanding of fundamental processes in plants matching those in other organisms. The impact of molecular genetics and the availability of model and crop species can be seen in all aspects of plant biology. For publication in The Plant Journal the research must provide a highly significant new contribution to our understanding of plants and be of general interest to the plant science community.
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