Gao Junping and Professor Ma Chao's team reveal the molecular mechanism of rose petal shedding

　　Recently, the team of Professor Gao Junping and Professor Ma Chao from the College of Horticulture of China Agricultural University published the title "Auxin regulates sucrose transport to repress petal abscission in rose (Rosa hybrida)" on the Plant Cell line. Research Papers. This study revealed that auxin regulates the molecular mechanism of rose petal shedding by regulating the transport of sucrose in the departure zone.

　　The first author of this paper is Liang Yue, from China A PhD student graduated in 2020 from the College of Horticulture, Agricultural University; Professor Gao Junping and Professor Ma Chao of the college are the co-corresponding authors. Professor Jiang Caizhong from the University of California at Davis and Professor Fei Zhangjun from Cornell University gave guidance and assistance.

　　The study found that during the natural fall of rose petals, With the increase in ethylene production, the transport of auxin and sucrose in the petals separation zone gradually weakened; auxin and sucrose treatments can significantly delay the rapid petal shedding induced by ethylene. Silencing the auxin response factor gene RhARF7 and the sucrose transporter gene RhSUC2 can significantly inhibit the sucrose transport in the petal separation zone and accelerate the petal shedding of rose; silencing RhARF7 and RhSUC2 double silence, and the single silencing of both have the effect on petal shedding There was no significant difference; but while silencing RhARF7, overexpression of RhSUC2 significantly restored the early shedding phenotype caused by RhARF7 silencing. It indicates that the RhARF7-RhSUC2 module mediates the interaction of auxin and sucrose and regulates petal shedding.

　　This research was funded by the National Key Research and Development Program and the National Natural Science Foundation of China Funding from key international cooperation and other projects has provided new knowledge for the elucidation of the sucrose-mediated interaction mechanism of ethylene and auxin in plant organ shedding, and laid a theory for the creation of rose germplasm resources and the research and development of postharvest preservation technology basis.