[Effect of CCC on bud fertility of grapes cv. Sultanina [Thompson Seedless]]
1993
Yevenez V, Alfonso Javier
A test was performed to determine the effect of Cycocel (CCC), applied at different times and rates, on the current season's fruit characteristics and following year's bud fertility of "Thompson Seedless" grapevines, as this cultivar genetically exhibits a low bud fertility in the cane's base. The plants were sprinkled with CCC and GA3 depending on the treatment. The CCC rates were 0.4 mM (r1) and 5.0 mM (r2), and 15.0 uM of GA3. Applications were made on October 19 (d1) and November 13, 1991 (d2). The following treatments were made: T0) untreated vines (control); T1) r1 d1; T2) r2 d1; T3) 15.0 uM of Ga3 on October 19 plus r1 d2; T4) 15.0 uM of GA3 on October 19 plus r2 d2; T5) r1 d1 plus r1 d2; T6) r1 d1 plus r2 d2; T7) r1 d2 and T8) r2 d2. In the 1991-1992 season, shoot length was measured and the number of nodes counted at bloom, veraison and harvest. At harvest time berry size, weight and shatter were measured. In the 1992 winter, a bud analysis was made and spur fruitfulness was quantified in the spring. Vigor decreased in the treatments with highest CCC (T4, T6 and T8), which were the most fruitful in the bud analysis and spur fruitfulness. There was an inverse relationship between the least node length and the greatest fertility (T4 and T6). A low correlation was found between the bud analysis and spur fruitfulness, although in both analyses T4 showed up clearly among the most fertile treatments and T3 among the least fertile ones. CCC application did not influence berry weight but it increased berry diameter and the soluble solids percentage virtually in all the treatments. The best CCC rate was the highest (5.0 mM) and the best application date, the second one (November 13, 1991). Likewise, GA3 application prior to CCC was favorable to the production of inflorescence primordia
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