AgNO₃ improved micropropagation and stimulate in vitro flowering of rose (Rosa x hybrida) cv. Sena

AgNO₃ melhora a micropropagação e estimula o florescimento in vitro de rosa (Rosa x hybrida) cv. Sena

Abstract

Rose is one of the most important cut flower in the world. Rose micropropagation was used for production of clonal and disease-free plantlets and to breeding purposes. However, many important rose cultivars showed physiological disorders as early-leaf senescence and very low multiplication rate under in vitro conditions. Our hypothesis is that these symptoms were associated with high sensibility of these cultivars to ethylene accumulation on in vitro environment. The rose cv. Sena was in vitro cultivated under different concentrations of AgNO₃ and two light sources, LED and fluorescent lamps, as a way to investigate in vitro similar symptoms to ethylene accumulation. AgNO₃ at 1.0-2.0 mg L^-1 solved the main in vitro physiological disorders observed in this rose cultivar. Also, AgNO₃ stimulated induction of 50% of rose shoots to in vitro flowering at 2.0 mg L^-1. Higher concentrations also resulted in flowering induction, but with imperfect flower development.

Keywords:
cut rose; micropropagation; physiological disorders; ethylene inhibitor, flower induction