Effects of gibberellic acid and paclobutrazol on fruit size, shape, locule number and pedicel length of kiwifruit

Burge, G. K.; Spence, C. B.; Broadbent, Noel D.

doi:10.1016/0304-4238(90)90086-t

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…Our findings are in accordance with the work of who reported that gibberellic acid enhanced the percentage of aborted flowers and malformed fruits, resulting in a major reduction in total marketable yield (Agusti et al, 1982;Sharma and Singh, 2009). Gibberellic acid in late season on kiwi fruit canes increase in pedicel length but reduced berry weight and fruit diameter (Burge et al, 1990). This might be due to sink of GA3 treated plant's reserves towards early flower production and fruit setting and runner production.…”

Section: Fruit Size (Cm)supporting

confidence: 92%

“…Our findings proved the positive increasing effect of chilling on increasing fruit weight as compared to the rest of the treatments and the reason was the efficient supply of food reserves from source to sink. Our results further found the negative effect of gibberellins on fruit weight as described by other scientists (Sharma and Singh, 2009), tomatoes, kiwifruit (Burge et al, 1990) and globe artichoke (Kasim et al, 2007). GA3 application reduced the time needed for inflorescence emergence, induced flowering and maximized the number of flower buds and open flowers in most growing conditions.…”

Section: Fruit Weight (G)supporting

confidence: 91%

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Flowering and Fruiting Responses of Strawberry to Growth Hormone and Chilling Grown Under Tunnel Conditions

Ikram¹

2016

PAKJAS

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Strawberry (Fragaria ananasa) is a berry fruit belonging to the family Rosaceae and requires certain amount of cold temperature to initiate flowering. Present study was conducted with the objective to study flowering and fruiting responses of strawberry to growth hormone and chilling under tunnel conditions. The study comprised of six different treatments as; control, GA3 (gibberellic acid) 200 ppm, GA3 400 ppm, chilling at 4°C, chilling at 4°C + GA3 200 ppm and chilling at 4°C + GA3 400 ppm. Treatments were applied at vegetative stage before flowering. It was inferred from the study that strawberry plants responded much better to application of GA3 at 400 ppm for their growth, flower stimulation, their number, quality features while chilling at 4°C proved better for maximum fruit production and better quality under tunnel condition.

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Section: Fruit Size (Cm)supporting

confidence: 92%

Section: Fruit Weight (G)supporting

confidence: 91%

Flowering and Fruiting Responses of Strawberry to Growth Hormone and Chilling Grown Under Tunnel Conditions

Ikram¹

2016

PAKJAS

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“…The evidence collected indicates that GA not only causes a feminization of male flowers but represents the hormone most directly related to sex expression. Actually, the following features were observed: i) in female plants, the GA treatment increased the stigma-style number and the density of papillae; ii) in male plants, GA promoted the development of styles which was accompanied by a decrease in pollen grain viability; this indicates that the product of feminization was not a phenocopy of Matua-h (Messina et al, 1990) or other fruiting males described in the literature (Seal & McNeilage,211 Hirsch et al, 1990); iii) in both clones, the intensity of sex expression was related to pedicel length, a character which is known tobe influenced by the hormone (Burge et al, 1990). Of course, the concurrence of other growth substances is not to be excluded: actually, in most monoecious and dioecious species, several hormones act in a synergic or antagonistic mode to regulate sex expression.…”

Section: Discussionmentioning

confidence: 93%

Sex modification in Actinidia deliciosa var. deliciosa

1992

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The aim of the trial was to determine whether growth regulators and injuries could affect sex expression in the cultivated kiwifruit. Growth substances (NAA, BAP, GA, ethephon, ABA, TIBA, and CCC) were applied at 1% concentration in lanolin (w/w) to shoots of 17-year old plants of the staminate clone Matua and the pistillate clone Hayward. Injuries consisted in shoot defoliation or removal of a ring of phloematic tissue from the laterals. Both the application of growth regulators and injuries were done about 5 weeks before anthesis. In the pistillate clone, no treatment resulted in overcoming pollen grain sterility; ABA and GA increased the stigma-style number as well as the density of papillae on the stigma surface. A positive correlation was found between stigma-style number and pedicel length (r = 0.660). In the staminate clone, pollen grain viability was significantly altered by treatment; the highest (79.2%) and lowest (10.3%) values were recorded for ABA and GA, respectively. A negative correlation was found between pollen grain viability and pedicel length (r--0.648). As a general rule, treatments which depressed pollen grain viability allowed the development of a variable number of styles. About 20 styles were consistently produced when GA was applied; the gibberellin-caused feminization of kiwifruit was confirmed in a repeated trial. The data collected also suggest that sex expression can be slightly changed by injuries; contrariwise, rather good results can be achieved by using a growth regulator earlier in the season or before flower initiation.

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“…Such affects on assimilate transport may be hormonally regulated (Patrick 1987). Burge et al (1990) have shown that application of GA 3 to kiwifruit canes after budbreak increased pedicel length whereas PP333 decreased it, with a corresponding decrease or increase in fruit weight.…”

Section: Effects Of Flower Quality On Fruit Weightmentioning

confidence: 99%

Flower quality and fruit size in kiwifruit (Actinidia deliciosa)

McPherson

Richardson²,

Snelgar

et al. 2001

New Zealand Journal of Crop and Horticultural Science

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Kiwifruit (Actinidia deliciosa (A. Chev.) C.F. Liang et A.R, Ferguson 'Hayward') vines were grown at five sites that represented the climatic range of the major kiwifruit growing regions of New Zealand. Hydrogen cyanamide was applied to half the vines at three of the sites. Measurements of flower quality over two seasons were used to determine if this was linked to fruit weight at harvest. There was a progressive increase in ovary fresh weight and ovary dry weight from warmer to cooler sites. Hydrogen cyanamide increased ovary fresh weight by between 6 and 20% and fruit weight by up to 11%Corresponding author. H00010 Received 13 April 2000; accepted 30 March 2001at the two warmest sites. Variation in ovary fresh weight and dry weight accounted for some of the variation in fruit weight 170 days from flowering in the first season, but over both seasons, by itself, had no predictive value. The highest correlation between fruit weight and flower quality across both seasons was with the ratio of pedicel length to seed number (r 2 = 0.56). The relatively consistent relationships that have previously been found between crop load and average fruit weight and between flower quality and fruit weight at harvest did not apply over different seasons and regions.

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Effects of gibberellic acid and paclobutrazol on fruit size, shape, locule number and pedicel length of kiwifruit

Cited by 7 publications

References 9 publications

Flowering and Fruiting Responses of Strawberry to Growth Hormone and Chilling Grown Under Tunnel Conditions

Flowering and Fruiting Responses of Strawberry to Growth Hormone and Chilling Grown Under Tunnel Conditions

Sex modification in Actinidia deliciosa var. deliciosa

Flower quality and fruit size in kiwifruit (Actinidia deliciosa)

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