Rose hybrida is an important flower crop worldwide. The quality control is the core issue in the production of cut flowers. In production and circulation, the senescence of rose flowers is an important factor affecting its flowering quality.
In December 2019, Horticulture Research published an online research paper entitled RhMYB108, an R2R3-MYB transcription factor, which is involved in ethylene- and JA-induced petal senescence in rose plants, which revealed a new mechanism of rose petal senescence.
Previous research has shown that flower senescence is initiated and accelerated by various hormone signals, of which ethylene is a promoter of flower senescence. It was found in this study that an R2R3-MYB transcription factor RhMYB108 is highly expressed in senescent petals. Exogenous application of ethylene and jasmonic acid can not only accelerate the senescence process of flowers but also induce a large accumulation of RhMYB108 at the transcription aspect. Virus-induced gene silencing (VIGS) RhMYB108 can slow the promotion of rose flower senescence by ethylene and jasmonic acid. Further molecular biological analysis proved that the transcription factor RhMYB108 can bind to the promoters of aging-related genes RhSAG113, RhNAC053, and RhNAC092 to regulate its transcription (As shown below). The results provide a new entry point for analyzing the molecular mechanism of rose flower senescence from hormone signals.
Professor Li Yonghong of Shenzhen Vocational and Technical College is the corresponding author of the paper. Postdoctoral Zhang Shuai and Zhao Qingcui are co-first authors. Professor Ma Nan from the College of Horticulture, China Agricultural University also participated in the work in cooperation. The research was supported by the National Natural Science Foundation of China.