Efeito de concentrações de glicina e inositol no cultivo in vitro de duas frutíferas de clima temperado

Abstract

Aiming to improve the in vitro cultivation techniques of two temperate fruit i.e. blackberry cv. Tupy and grapevine rootstock cv. Kobber 5BB, different glycine and inositol concentrations in the culture medium were tested. The culture medium was constituted of MS basal medium, added of 30 g L-1 sucrose and 7 g L-1 agar, and the pH adjusted to 5.8 before the sterilization of 121ºC and 1 atm for 20 minutes, and DSD1 basal medium for grapevine rootstock cv. Kobber 5BB, added of 20 g L-1 sucrose and 7 g L-1 agar, and the pH adjusted to 6.4. The work with blackberry consisted of 5 different concentrations of glycine (0; 1.0; 2.0; 4.0 and 8.0 mg L-1), 5 of inositol (0; 500; 100; 200 and 400 mg L-1) and its combinations. The work with grapevine composed of 4 different concentrations of glycine (0; 1.0; 2.0 and 4.0 mg L-1), 4 of inositol (0; 10; 20 and 40 mg L-1), and its combinations. Nodal segments from in vitro plants was excised and introduced into test tubes containing 15 mL of culture medium. After that, the culture tubes were transferred in a growth room to 25 ± 2ºC, irradiance of 32 mol m-2.s-1 and photoperiod of 16 hours. The experiments were settled in a completely randomized design, using twelve explants per treatment. After 70 days of in vitro cultivation, better results for the blackberry cv. Tupy were obtained with glycine concentration as recommended in the MS culture medium (2 mg L-1) and 4 fold of the inositol value. For the grapevine rootstock, better results were obtained in the absence and/or with low glycine concentrations and the same or higher inositol concentration as recommended in the DSD1 culture medium.