阿拉伯芥MSI4/FVE基因對開花及非生物逆境功能之研究

Function of MSI4/FVE in controlling flowering time and abiotic stress responses in Arabidopsis

張高愿(Kao-Yuan Chang)

指導教授 ： 吳克強

國立臺灣大學/生命科學院/植物科學研究所/碩士(2012年)

https://doi.org/10.6342/NTU.2012.10631

摘要

MSI1-like (MSIL)蛋白是哺乳類動物中RbAp48蛋白的同源蛋白，這類蛋白通常沒有任何催化活性，但對於生物中生長發育卻扮演著重要的角色。在後生動物以及植物中，MSIL蛋白通常會和其他蛋白形成複合體並調節染色質的動態變化。在阿拉伯芥中，有五類MSIL蛋白，其中第四類蛋白稱做MSI4/FVE。MSI4/FVE會經由抑制開花負調控因子FLC影響植物開花。組蛋白去乙醯化酶HDA6是屬於RPD3類型的組蛋白去乙醯化酵素。在這篇研究中，我們證實了FVE可以跟HDA6相互作用,並且經由影響組蛋白去乙醯化(H3K9K14Ac)以及組蛋白甲基化(H3K4me3)抑制FLC的表現。我們也進一步研究了FVE是否也參與非生物性逆境反應。經由發芽率以及根長的實驗，我們證實了FVE也參與在ABA以及滲透壓的逆境反應，並且ABA反應相關的基因也在受到FVE的調控。綜合以上結果顯示出FVE/MSI4對於植物開花以及非生物性逆境反應都扮演著重要的角色。

關鍵字

阿拉伯芥 ； 組蛋白去乙醯化酶MSI4/FVE ； HDA6 ； 開花 ； ABA ； 非生物逆境

並列摘要

MSI1-like (MSIL) proteins are homologous to the mammalian RbAp48 protein, which shows no catalytic activity but has specific function during development. In both metazoans and plants, MSI1-like proteins are part of several protein complexes involved in diverse chromatin functions. A plant homolog of RbAp48, MSI4/FVE, is involved in the autonomous pathway regulating flowering time by repressing FLC. HDA6 is a RPD3-type histone deacetylase. In this study, we show that HDA6 interacts with FVE and regulates flowering time by repressing FLC through decreasing H3K4 trimethylation and H3 acetylation. In addition, FVE was also involved in abiotic stress responses. Compared with wild-type, the hda6, fve-4 and hda6fve double mutant plants were hypersensitive to ABA and mannitol in seed germination and root length assays. Furthermore, the expression of ABA-response gene was changed in these mutants. Taken together, these data suggest that FVE/MSI4 plays an important role in flowering and abiotic stress responses.

並列關鍵字

Arabidopsis ； Histone deacetylase ； MSI4/FVE ； HDA6 ； flowering ； ABA ； abiotic stress

參考文獻

Aasland, R., Gibson, T.J., and Stewart, A.F. (1995). The PHD finger: implications for chromatin-mediated transcriptional regulation. Trends Biochem. Sci. 20, 56-59.

Abe, H., Yamaguchi-Shinozaki, K., Urao, T., Iwasaki, T., Hosokawa, D., and Shinozaki, K. (1997). Role of Arabidopsis MYC and MYB homologs in drought and abscisic acid-regulated gene exopression. Plant Cell 9, 1859-1868.

Abe, H., Yamaguchi-Shinozaki, K., Urao, T., Iwasaki, T., Hosokawa, D., and Shinozaki, K. (1997). Role of Arabidopsis MYC and MYB homologs in drought and abscisic acid-regulated gene expression. Plant Cell 9, 1859-1868.

Abe, H., Urao, T., Ito, Y., Seki, M., Shinozaki, K., and Yamaguchi-Shinozaki, K. (2003). Arabidopsis AtMYC2 (bHLH) and AtMYB2 (MYB) function as transcriptional activators in abscisic acid signaling. Plant Cell 15, 63-78.

Alexandre, C., Möller-Steinbach, Y., Schönrock, N., Gruissem, W., and Hennig,