Recently, Wang Changquan's research group of School of Horticulture of Nanjing Agricultural University published a research paper entitled "alternative expressions of rccol4 in short day and RCCO in long day facility day neutral response in Rosa chinensis" in the international academic journal Journal of experimental botany. This paper reveals a new mechanism of insensitive flowering to photoperiod, which provides a new perspective for understanding the continuous flowering characteristics of rose.
There are three types of Rosa plants: single flowering, occasional second flowering and continuous flowering. Continuous flowering is not limited by seasons and sunshine length, but can bloom as long as the growth conditions are suitable, so it is generally considered as a day neutral response. According to the length of light needed for flowering, plants can be divided into long sunshine plants, short sunshine plants and neutral plants. Great progress has been made in the study of flowering regulation of Arabidopsis thaliana and rice, but little is known about the flowering mechanism of neutral plants. In this study, we analyzed the regulatory mechanism of RCCO and rccol4 in the neutral flower formation of rose.
The results showed that RCCO was highly expressed and played a leading role in the flowering of rose under long sunshine, while rccol4 was highly expressed and played a role in flowering regulation under short sunshine, and rccol4 was located in the upstream of RCCO. Rccol4 promotes the binding of core elements on RCCO and RCFT promoter through interaction with RCCO protein, thus promoting the expression of RCFT under short sunlight, so that rose can also blossom under short sunlight, showing light cycle insensitivity (as shown in the figure below). Moreover, box1 in rccol4 protein structure is essential for its functional interaction.
Lu Jun and sun Jingjing, Ph.D. students in the school of horticulture, Nanjing Agricultural University, are the co first authors of the paper. Wang Changquan, Professor of the school of horticulture, is the corresponding author of the paper. Jiang Anqi, Bai mengjuan, fan Chunguo, Liu Jinyi, etc. have participated in part of the work. Ning Guogui, Professor of Huazhong Agricultural University, has provided help for the experiment. The research was supported by national key R & D plan (2019yfd1000400) and National Natural Science Foundation (31972449, u1803102, 31801890).
Paper link: https://academic.oup.com/jxb/advance-article-abstract/doi/10.1093/jxb/eraa161/5813489? Redirectedfrom = Fulltext
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