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Abstract

Endogenous abscisic acid (ABA) decreased during chilling in buds of several cultivars of Vitis vinifera L., Vitis riparia Michx. and Vitis labruscana Bailey, both in field grown and greenhouse vines. During bud burst, ABA decreased on a concentration basis only, until just prior to leaf unfolding. Bud scale removal hastened bud burst. Although ABA content was higher in scales than in primordia, changes in ABA level during chilling and bud burst occurred only in primordia. Lateral buds, which are committed to grow the year of formation, had higher ABA levels than dormant axillary buds which require a chilling period to grow. Applications of ABA, gibberellic acid (GA3), and (2-chloroethyl)trimethylammonium chloride (CCC) to dormant, chilled grape cuttings had no effect on time to burst, while zeatin hastened burst. These results suggest that, if there is an interaction between chilling and ABA, it is of secondary importance in bud burst of grape.

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Abstract

Peach leaf and flower buds showed different light requirements for opening. Leaf bud opening required light, the active range for the process was 600 - 690 m. Flower bud opening was relatively light independent. Green light or low light intensities slightly promoted it, while red and white light or high intensities caused some inhibition.

Open Access

maintaining growth ( Flore and Layne, 1999 ; Keller and Loescher, 1989 ; Maust et al., 2000 ; Rady and Seif El-Yazal, 2013 ) during periods of stress (such as dormancy, the breaking of dormancy, and initial stages of bud burst). In many fruit trees

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’, which showed that a minimum 1000 chill hours were required for the shortest duration for bud burst under controlled conditions. Additionally, this study aims to highlight the difficulty in providing clear information depending on method of quantification

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, 1994 ). Similar shoot development in the bud stage was found for japanese privet. Despite preformed lateral bud maturation during the present growing season, lateral buds located in new branches only burst the next growing season or if apical dormancy

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-grown willows used for cut-stem production based on yield and timing of tip abscission and floral bud burst across five concentrations of controlled-release fertilizer. Yield data were collected on commercially important parameters: total stem length, stem

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fulfilled; as a result, vegetative and flower buds start to swell and burst (“budbreak”), followed by vegetative growth or flowering and subsequent fruit development ( Beauvieux et al., 2018 ; Dennis, 2003 ). Therefore, the timing of dormancy release and

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Abstract

Single axillary bud explants of apple (Malus domestica Borkh.) were removed from ‘Antonovka’ seedlings or from ‘Delicious’ trees budded on seedling rootstocks, and cultured aseptically under controlled conditions. Many excised buds grew, even though similar buds on intact resting trees did not. Chilling excised buds of ‘Antonovka’ seedlings for 2 weeks in vitro did not increase the number of bursting buds, but promoted shoot elongation on some dates. Chilling ‘Delicious’ trees for 6 and 8 weeks before excising buds promoted both bud burst and shoot elongation. A substantial number of buds excised from ‘Delicious’ trees chilled for as long as 21 weeks did not burst, suggesting other limiting factors.

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delayed phenological development in more frost-prone areas. However, cultivar differences in frost resistance appeared to be related to factors other than bud phenology. Small but consistent differences in frost resistance of buds at the same growth stage

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Abstract

Removal of bud scales hastened bud burst of several early and late blooming apple cultivars. Descaling was most effective during the onset and end of rest. During deep rest, bud scale removal was effective only when applied 2 weeks before forcing conditions. Extracts of bud scales inhibited apple bud break in vitro. Abscisic acid (ABA) may have been responsible for part or all of this bioactivity, since ABA occurred in bud scale diffusates and could replace or reinforce the bud scales in vitro. Wound-produced ethylene was not involved in the bud scale removal response.

Open Access