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Botany at the Univ. of California. S. S-G. acknowledges the financial support of CONACYT, INIFAP and SNI of Mexico and the University of California, Riverside. We thank Charlie W. Coggins, Jr., for his advice on the selection of GA 3 concentrations and

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’ mandarin ( Talon et al., 1992 ), apple ( Bangerth and Schröder, 1994 ), and pear ( Deckers and Schoofs, 2002 ). Application of GA 3 during or shortly after anthesis increases parthenocarpic fruit set in various persimmon cultivars ( George et al., 1997

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growth and development and might prove useful as tools to achieve these goals. Gibberellic acid (GA 3 ) is the PBR that is most frequently reported to successfully alter the date and intensity of flowering in fruit trees. GA 3 application to mango

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sunflower cultivar Sunspot. Comparisons of responses to GA 3 and uniconazole (UCZ), a GA biosynthetic inhibitor, application with the tall cultivar of sunflower Mammoth Grey indicated that ‘Sunspot’ is GA insensitive. Recently, Ramos et al. (2013) mapped

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, to raise lower pods higher off the ground and allow the cutting blades on a direct harvester to cut the stem below those pods. This may be accomplished by application of a growth-stimulating compound such as GA 3 . The ability of gibberellins to

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of 50% success rate (unpublished data). Gibberellic acid (GA 3 , GA 4 , and GA 7 ) has been shown to break dormancy and increase germination in seeds of several genera ( Bewley and Black, 1982 , 1985 ), including certain penstemon ( Atwater, 1980

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A study was initiated to determine the effect of GA3 as a counter measure to restore the growth of over-retarded poinsettia. Euphorbia pulcherrima `Sonora Red' plants were treated once foliarly with paclobutrazol at 40 or 80 mg·L-1 one week following pinching. Four weeks later, plants receiving the 80 mg·L-1 rate were treated once foliarly with GA3 at 0, 10, 20, 30 or 40 mg·L-1. The effect of GA3 was visible within 3 days of application. GA3 between 10 and 40 mg·L-1 caused long internodes, excessive stem elongation, as well as small leaves and bracts, resulting in unmarketable plants. Plants receiving 10 mg·L-1 GA3 were nearly twice the height of the over-retarded plants (31 vs. 17 cm), with increasingly taller plants at higher concentrations, up to 30 mg·L-1. In a second experiment, single-stemed plants were treated with one foliar spray of 50 or 150 mg·L-1 paclobutrazol two weeks following the beginning of short days. After another 3 weeks, the overdosed plants were then foliarly treated once with 0, 3, 5, 10, or 15 mg·L-1 GA3. GA3 at all rates promoted stem elongation and resulted in large bracts and much increased inflorescence diameter. The 15 mg·L-1 GA3 rate resulted in undesirable long internodes on the upper stem. Plants that received 3, 5, or 10 mg·L-1 GA3 were of excellent quality, with their heights and inflorescence sizes similar to those of plants receiving 50 mg·L-1 paclobutrazol (26 cm). Parallel experiments using `Burgundy Cortez' had similar results.

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The effects of different GA3 concentrations and application times on fruit set, fruit development period, and fruit quality in rabbiteye blueberry (Vaccinium ashei Reade) were studied. Flower clusters were sprayed with 100 or 250 ppm GA3 at 90% full bloom and again 7 days later, or with 125 ppm GA3 at 90% full bloom and again 7, 21, and 42 days later, under greenhouse conditions. Fruit set was monitored every 10 days and fruit weight, fruit development period, soluble solids, and titratable acidity were measured at harvest.

Fruit set in GA3 treatments averaged 69 to 76% compared to an average of 43% for the pollinated control. Weight of GA3 treated berries averaged 1.2, g while that of pollinated berries averaged 2.0 g. However, calculated total yield was greater for the GA3 treatments compared to the pollinated control, averaging 244 and 206 g/treatment, respectively. GA3 increased the fruit development period by 2 to 11 days, depending on the treatment. Soluble solids and titratable acidity were not affected by any treatment.

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regulator treatments, especially those including gibberellin ( Cadman et al., 2006 ). Germination of P. cernua seeds can increase to >92% if they are treated with kinetin, gibberellin GA3, and 2, 4-D for 24 h compared with 18% in untreated controls ( Gu et

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growers. Gibberellic acid GA 3 is used to increase the fruit firmness and the fruit size, and to delay maturity in mostly self-fertile and/or high-cropping cherry varieties in British Columbia ( Kappel and MacDonald, 2002 ) and western North America

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