Giberelina, citocinina e auxina na qualidade química de bagas de uva 'Superior Seedless'

Abstract

Trials were carried out in Juazeiro, Bahia State, Brazil, aiming to test plant regulators composed by gibberellin, cytokine and auxin effects on chemical quality of Superior Seedless grape berries. The first trial studied the effects of Stimulate® (bio regulator) and X-Cyte® (cytokine) associated to a new gibberellin formulation (N-Large®) and associated to Pro-Gibb®, which is a product used as source of gibberellin. Products were sprayed at berries development phase (18, 21, 51 and 56 days after spur-pruning). Treatments were: T1: Pro-Gibb®; T2: Stimulate® (Dose 1); T3: Stimulate® (Dose 2); T4: Stimulate® (Dose 3); T5: Pro-Gibb® + X-Cyte® (Low Dose - DB); T6: Pro-Gibb® + X-Cyte® (Intermediate Dose - DM); T7: Pro-Gibb® + X-Cyte® (High Dose - DA); T8: N-Large®; T9: N-Large® + X-Cyte® (DB); T10: N-Large® + X-Cyte® (DM); T11: N-Large® + X-Cyte® (DA). The second trial aimed to assess the effect of the new gibberellin formulation (N-Large®) associated or not with cytokine (X-Cyte®) also sprayed straight over the bunches at berries development phase (17, 55 e 66 days after spur-pruning). Treatments were: T1: Pro-Gibb® - blank; T2: N-Large® (DB); T3: N-Large® (DM); T4: N-Large® (DA); T5: N-Large® (DB) + X-Cyte® (DB); T6: N-Large® (DB) + X-Cyte® (DM); T7: N-Large® (DB) + X-Cyte® (DA); T8: N-Large® (DM) + X-Cyte® (DB); T9: N-Large® (DM) + X-Cyte® (DM); T10: N-Large® (DM) + X-Cyte® (DA); T11: N-Large® (DA) + X-Cyte® (DB); T12: N-Large® (DA) + X-Cyte® (DM); T13: N-Large® (DA) + X-Cyte® (DA). Experimental design was random blocks with four repetitions with each repetition/parcel having three useful plants in the same row. At harvest, when bunches average had soluble solids over 15 ° Brix, berries were collected for soluble solids, pH, titratable acidity analysis as well as (SS/AT) ratio calculation. In both trials, plant regulators evaluated did not provide significant changes on chemical quality of 'Superior Seedless' grape berries. Therefore, the lack of differences on response between the commercially used product (Pro-Gibb®) and the other products tested (Stimulate®, X-Cyte® e N-Large®) prove the last as promising for the 'Superior Seedless' grape cultivation, leaving a larger range of alternative for grape farmers in the São Francisco Valley, Bahia.