CARBON SOURCE ON in vitro MULTIPLICATION OF ‘MC’ AND ‘ADAMS’ QUINCE ROOTSTOCKS

Resumo

The objective was to determine the best carbon source and
concentration for in vitro multiplication of quince MC and Adams
cultivars. Nodal segments (1.0 cm and 1-2 buds) were inoculated
in MS and as a carbon source, sucrose, fructose or sorbitol were
used with the following concentrations: 0, 15, 30, 45 and 60 g L-1.
After 60 days, it was observed that, for ‘MC’, 60 g L-1 sucrose and
30 g L -1 fructose yielded 100% sprouted explants. The highest
shoot length average (1.49 cm) was obtained with 30 g L-1 sucrose
and 60 g L-1 sorbitol. The concentration of 45 g L-1 provided the
highest number of shoots (1.76), higher fresh mass (0.058 g) and higher dry matter (0.02 g), regardless of the carbon source. For ‘Adams’, the highest number of shoots (1.47) was obtained with sucrose and the higher dry mass of shoots (0.01 g) was obtained with sucrose and sorbitol. The sucrose concentration of 30 g L-1 provided the highest shoot lenght average (2.14 cm) and higher fresh weight (0.1 g) and 45 g L-1 sorbitol provided greater dry mass of shoots (0.03 g ). The highest percentage of sprouted explants was obtained at a concentration of 30 g L-1 (79.58%) and sucrose as carbon source (71.25%). The highest average number of shoots (1.45) was obtained with 30 g L-1. It was concluded that 45 g L-1 sucrose for ‘MC’ and 30 g L-1 sucrose for ‘Adams’ were the best concentrations for in vitro multiplication.