Effect of Dormex, CPPU and GA3 on berry
growth and ripening of Pusa Seedless cultivar of grape.
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Bikash
Das,Pandey, S. N.,Jindal, P. C.,Sureja, A. K |
Division of
Fruits and Horticultural Technology, Indian Agricultural Research
Institute, New Delhi, India. |
The effects
of Dormex (40% aqueous hydrogen cyanamide), CPPU [forchlorfenuron], and
gibberellic acid (GA3) on the fruit growth and ripening of grape cv.
Pusa Seedless were studied in New Delhi, India, in 1998. The treatments
consisted of spraying plants with 1.5% Dormex solution immediately after
pruning (T1), T1 + dipping of bunches in 0.15% CPPU solution after
fruit set (T2), and T2 + dipping of bunches in 45 ppm GA3 at the full
bloom stage. Fruits were sampled at weekly intervals from two weeks
after flowering until harvest. Plants treated with Dormex exhibited
earlier bud break (by 30 days), flowering (by 12 days), and ripening (by
7 days) than the control. Unlike in the control and Dormex-treated
plants, fruit fresh weight in plants under T2 and T3 increased
continuously until harvest. Ripening date did not significantly vary
between the control plants and plants under T2 and T3, however, fruit
growth period was longer in plants under T2 and T3 than in the control.
Treated plants had higher fruit fresh weight than the control. The total
soluble solids (TSS) content did not significantly vary among the
control plants, and plants under T1 and T2 (18.33, 18.56, and 18.46 deg
Brix, respectively). T3 gave the highest final fruit weight (212 g) and
TSS content (19.26 deg Brix). |
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