Abstract
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.
Highlights
Roses (Rosa X hybrida L.) are the most economically and socially important cut flower industry around the world (Rezvanypour and Osfoori, 2011), and the main producing countries are Ecuador, Colombia, Kenya, Ethiopia and India, with focus on exportations (Vellekoop, 2018)
In vitro controlled environmental conditions are excellent for studies with in vitro flowering, especially due to the testing isolated factors as plant growth regulators or specific environmental factor, supporting in the study of the biological mechanism of flowering induction and
Based on the several benefits reported by the use of Ag+ sources for in vitro cultivation, the main objective of this study was to evaluate the effects of different concentrations of AgNO3 and the use of light emitting diodes (LED) lighting on the in vitro development of rose cv
Summary
Roses (Rosa X hybrida L.) are the most economically and socially important cut flower industry around the world (Rezvanypour and Osfoori, 2011), and the main producing countries are Ecuador, Colombia, Kenya, Ethiopia and India, with focus on exportations (Vellekoop, 2018). Rose cultivars are propagated by cutting or grafting. There are reports in the literature about the use of micropropagation of different rose cultivars (Kanchanapoom et al, 2010; Jana and Sekhawat, 2011). Besides micropropagation aiming production of high quality and free-pest and disease plantlets, plant tissue culture has many other applications. AgNO3 improved micropropagation and stimulate in vitro flowering of rose (Rosa x hybrida) cv. Sena led to development of new technologies, such as in vitro pollination and breeding (Silva et al, 2014)
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