Influence of Fruit Load Just Before Fruit Thinning on Fruit Size, Yield and Flower Bud Formation in Satsuma Mandarin

A range of concentrations and timings of CPPU application were evaluated in attempt to identify situations in which fruit size, flesh firmness, and soluble solids could be increased while minimizing increased incidence of fruit asymmetry and reductions in flower bud formation and fruit surface red color on 'McIntosh' apples (Malus×domestica Borkh.). The greatest response to CPPU for most attributes evaluated occurred when it was applied at fruit size between 6 mm and 16 mm. The conclusion from this series of experiments is that differential response to CPPU could not be established by altering the time of application. The response to CPPU is linear with increasing concentration. Results suggested that use of 4 to 6 mg·L-1 CPPU on apples to increase fruit size was the maximum and appropriate range to use without causing fruit asymmetry. Chemical name used: N-(2-chloro-4-pyridyl)-N′-phenyl urea (CPPU)

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REFLECTIVE MULCH IMPROVES FRUIT SIZE AND FLOWER BUD FORMATION OF PEAR CV CLARA FRIJS

Acta Horticulturae ◽

10.17660/actahortic.2005.671.10 ◽

2005 ◽

pp. 87-95 ◽

Cited By ~ 3

Author(s):

M. Bertelsen

Keyword(s):

Fruit Size ◽

Flower Bud ◽

Bud Formation ◽

Flower Bud Formation

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Application of an Analog of 9, 10-ketol-octadecadienoic acid (KODA), Affected Flower Bud Formation and MdTFL1 and MdFT1 Gene Expressions in Apple Buds under Heavy-crop and Shade Conditions

Journal of the American Society for Horticultural Science ◽

10.21273/jashs.138.2.102 ◽

2013 ◽

Vol 138 (2) ◽

pp. 102-107

Author(s):

Monrudee Kittikorn ◽

Katsuya Okawa ◽

Hitoshi Ohara ◽

Satoru Kondo ◽

Nobuhiro Kotoda ◽

...

Keyword(s):

Octadecadienoic Acid ◽

Octadecenoic Acid ◽

Full Bloom ◽

Flowering Locus T ◽

Gene Expressions ◽

Flower Bud ◽

Bud Formation ◽

Fruit Thinning ◽

Terminal Flower 1 ◽

Flower Bud Formation

Changes of endogenous 9, 10-ketol-octadecadienoic acid (KODA) concentrations, which is synthesized from linolenic acid by 9-lipoxygenase, were analyzed in apple [Malus ×sylvestris (L.) Mill. var. domestica (Borkh.) Mansf.] buds. In addition, the effects of 15, 16-chloro, hydroxy-9-hydroxy-10-oxo-12(Z)-octadecenoic acid (CKODA) application, which is an analog of KODA, on flower bud formation and the expression of MdTFL1 (terminal flower 1) and MdFT1 (flowering locus t 1) genes in apple buds were investigated in heavy-crop treatment (HCT) and under shade. An increase of endogenous KODA in the buds in the fruit-thinning treatment, which resulted in a higher proportion of flower bud formation than in HCT, was observed at 63 days after full bloom, but no such increase was found in HCT. In the shade-treated and heavy-crop trees, the expression of MdTFL1 in the buds to which CKODA was applied was lower than that in untreated buds. In contrast, under shade, the expression of MdFT1 in the CKODA-treated buds was higher than that in untreated buds. These results suggest that endogenous KODA may be associated with flower bud formation, and its application may be effective at improving the proportion of flower bud formation through its effect on MdTFL1 and MdFT1.

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659 Reducing Floral Initiation and Return Bloom in Fruit Trees— Applications and Implications in Fruit Production: Pome Fruit

HortScience ◽

10.21273/hortsci.34.3.561e ◽

1999 ◽

Vol 34 (3) ◽

pp. 561E-561

Author(s):

Duane W. Greene

Keyword(s):

Fruit Set ◽

Fruit Size ◽

Fruit Trees ◽

Fruit Production ◽

Alternative Methods ◽

Pome Fruit ◽

Flower Bud ◽

Bud Formation ◽

Biennial Bearing ◽

Flower Bud Formation

Pome fruit display a biennial bearing tendency that is characterized by heavy flowering and fruit set one year followed by a year with reduced bloom and fruit set. This tendancy results in a year with heavy cropping with small fruit, and a subsequent year with large fruit and a small crop. Both situations are undesirable. Chemical thinners in the “on” year are frequently used to modify this cropping behavior. Alternative methods to control cropping by flower bud inhibitions will be discussed. Gibberellin application in the “off” year at or soon after bloom will inhibit flower bud formation and encourage moderate flowering. This method of crop regulation has been used infrequently. Gibberellins differ in their ability to inhibit flowering. Therefore, selection of a specific gibberellin and an effective concentration range may provide greater flexibility in controlling flowering. The cytokinins CPPU and thidiazuron inhibit flower bud formation, increase fruit size, and also thin fruit. Appropriate application of these cytokinins will be discussed where beneficial effects on fruit size may be achieved while maintaining a moderate level of flower bud formation.

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