ISHS Acta Horticulturae 329: VII International Symposium on Plant Growth Regulators in Fruit Production
THE EFFECT OF SEEDS AND THE APPLICATION OF A GROWTH REGULATOR MIXTURE, ON FRUIT GROWTH IN ‘HAYWARD’ KIWIFRUIT. |
| Authors: | J.G. Cruz-Castillo, D.J. Woolley, G.S. Lawes |
| Abstract:
In a field trial the increased fruit size response to the synthetic cytokinin N-(2-chloro-4-pyridyl)-N-phenylurea (CPPU) at 20 ppm was enhanced significantly when applied in combination with 2,4-dichlorophenoxyacetic acid (2,4-D) at 2.5 ppm, and gibberellic acid (GA3) at 5 ppm, to fruit with both low and high seed number. Low and high seeded fruit treated with the hormone mix had mean fresh weights of 102 and 136 g respectively, compared with 47 and 90 g in untreated fruit. The mean fruit weights for CPPU alone of 81 g and 120 g, were increased by 21 and 16 g by the addition of the hormone mix. In tissue culture there was no callus growth by fruit pericarp tissue in the absence of hormones, even when seed were present. A mix of 2,4-D + GA3 + 6 benzylaminopurine (BAP) resulted in callus growth. The greatest stimulation of the callus growth occurred with this hormone mix in the presence of seeds. | |
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