Role of growth regulators in grapes
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Role of growth regulators in grapes. Next. End. Growth Regulators. The use of growth regulators not only enhances the productivity of vines but also helps to produce quality grapes suitable for exports.

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Role of growth regulators in grapes

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Role of growth regulators in grapes

Role of growth regulators in grapes

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Role of growth regulators in grapes

Growth Regulators

  • The use of growth regulators not only enhances the productivity of vines but also helps to produce quality grapes suitable for exports.

  • Choice of growth promoters and regulators to be used depends upon the traits desired in the grapes meant for exports.

Gibberellic Acid

  • The amount of GA3 needed to optimize berry size depends on the cultivar and many other factors, but 10 to 60 g/acre is a typical application rate.

  • The GA3 may be applied once or several times; on some cultivars, multiple in-season applications may increase efficacy.

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Role of growth regulators in grapes

  • Application timing is critical and also varies by cultivar.

  • For many cultivars, the first application is made at , or when berry diameter is about 3-5 mm.

  • Later applications can delay fruit maturity and inhibit colour development in red- and black-fruited cultivars.

  • Breeding programs have continuously selected for grapes that produce naturally large berries, so many newer cultivars require less GA3 to attain optimal berry size than older cultivars.

  • Seeded grapes are generally less responsive to GA3 treatment than seedless grapes.

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Role of growth regulators in grapes

Other Plant Hormones

  • Forchlorfenuron (CPPU), a synthetic cytokinin, also may be applied at fruit set to increase berry size.

  • It can be applied by itself, or in combination with GA3, as CPPU and GA3 may have a synergistic effect on berry size.

  • Berries treated with CPPU tend to develop a rounder shape than non-treated berries.

  • This compound is highly potent and normally applied at very low doses (1 to 3 mg/L); excessive doses can delay maturity, retard colouring, and have a negative influence on taste.

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Role of growth regulators in grapes

The effects of various growth regulators and growth promoters are as follows-

(Source: NRC Grapes)

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Role of growth regulators in grapes

Effects of GA

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Role of growth regulators in grapes

Effects of Ethylene

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Role of growth regulators in grapes

Effects of Cytokinins

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