FRUIT DEVELOPMENT PERIOD OF SEVERAL RABBITEYE BLUEBERRY CULTIVARS

This study was designed to characterize the mechanisms of N-stimulated peach Prunus persica (L.) Batsch productivity. The effects of N fertilization on potential assimilate availability (source capacity) and on the growth capacity of individual fruit (sink capacity) were assessed. On heavily thinned trees, fertilization did not stimulate fruit growth rates relative to those on nonfertilized trees, suggesting that fruit growth rates were not assimilate-limited throughout the period of fruit development. However, N fertilization resulted in a longer fruit development period and increased the growth potential of individual fruit by 20% (fresh mass) and 15% (dry mass) vs. controls. In unthinned trees, N fertilization increased total fruit yield by 49% (fresh mass) and 40% (dry mass) compared to the unthinned, nonfertilized controls. N fertilization increased total fruit yield per tree in unthinned peach trees by extending the fruit development period and thus increasing the amount of assimilate accumulated for fruit growth. The fruit development period was prolonged both by assimilate deprivation associated with increasingly higher crop loads and by N fertilization. Thus, the prolongation of the peach fruit development period by N-fertilization appears inconsistent with the role of N in increasing assimilate availability for fruit growth. We conclude that N fertilization stimulates peach yields by increasing the period for fruits to use assimilates (sink capacity). The effect of N on assimilate availability was not directly evaluated. The timing of fertilizer N availability did not influence fruit growth potential.

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Effect of Bee Pollination and GA3 on Fruit Size and Maturity of Three Rabbiteye Blueberry Cultivars with Similar Fruit Densities

HortScience ◽

10.21273/hortsci.34.6.1106 ◽

1999 ◽

Vol 34 (6) ◽

pp. 1106-1107 ◽

Cited By ~ 8

Author(s):

D. Scott NeSmith ◽

Gerard Krewer

Keyword(s):

Gibberellic Acid ◽

Fruit Development ◽

Fruit Size ◽

Primary Factor ◽

Fruit Maturation ◽

Bee Pollination ◽

Maturation Period ◽

Vaccinium Ashei ◽

Development Period ◽

Fruit Load

Plants of the rabbiteye blueberry (Vaccinium ashei Reade) cultivars Brightwell, Climax, and Tifblue were subjected to pollination with bees or to applications of 250 mg·L-1 of gibberellic acid (GA3) to examine the influence on fruit size and maturation period. Plants were thinned to a similar fruit density (FD) 4 weeks after anthesis. `Tifblue' and `Climax' fruit were smaller on GA3-treated than on bee-pollinated plants, but no difference was observed for `Brightwell'. The fruit maturation period for `Climax' was not affected by treatments, but `Brightwell' and `Tifblue' fruit on pollinated plants ripened 2 weeks earlier than fruit on GA3-treated plants. These data suggest that excess fruit load is not the primary factor responsible for the smaller fruit size and lengthened fruit development period resulting from GA3 applications to rabbiteye blueberries.

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Distribution of 13C-photosynthates to roots during fruit development period in vertically trained watermelon plants with two vines and one fruit

Root Research ◽

10.3117/rootres.13.45 ◽

2004 ◽

Vol 13 (2) ◽

pp. 45-49 ◽

Cited By ~ 1

Author(s):

Shin-ichi WATANABE

Keyword(s):

Fruit Development ◽

Development Period

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Seasonal Progression in Nutrition Density of Mandarin Cultivars and Their Relationship with Dry Matter Accumulation during Fruit Development Period

Communications in Soil Science and Plant Analysis ◽

10.1080/00103624.2020.1849262 ◽

2020 ◽

Vol 51 (22) ◽

pp. 2791-2804

Author(s):

Jaspreet Singh ◽

Tanjeet Singh Chahal ◽

Parmpal Singh Gill

Keyword(s):

Fruit Development ◽

Dry Matter ◽

Dry Matter Accumulation ◽

Development Period

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GA3—INDUCED FRUIT SET OF RABBITEYE BLUEBERRY

HortScience ◽

10.21273/hortsci.27.6.689c ◽

1992 ◽

Vol 27 (6) ◽

pp. 689c-689

Author(s):

Raguel Cano—M ◽

Rebecca L. Darnell

Keyword(s):

Fruit Quality ◽

Fruit Development ◽

Fruit Set ◽

Total Yield ◽

Titratable Acidity ◽

Fruit Weight ◽

Soluble Solids ◽

Full Bloom ◽

Development Period

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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New late ripening apricot genotypes from a multipurpose apricot breeding programme in Turkey

Czech Journal of Genetics and Plant Breeding ◽

10.17221/159/2016-cjgpb ◽

2018 ◽

Vol 54 (No. 1) ◽

pp. 34-38

Author(s):

J.M. Cross ◽

F.E. Karaat ◽

F. İnceoğlu ◽

Z.T. Murathan ◽

B.M. Asma

Keyword(s):

Fruit Development ◽

Dry Matter ◽

Fruit Size ◽

Fruit Weight ◽

Breeding Programme ◽

Total Acidity ◽

Fruit Species ◽

Development Period ◽

Production And Consumption ◽

Long Time

The harvest season of apricots is short and fruit cannot be protected in cold stores for a long time. For those reasons, apricot production and consumption are lower than in other fruit species. This study was conducted for the purpose of breeding new late ripening apricot varieties. To this aim, a total of 3718 hybrid genotypes of apricots were obtained from 42 crosses. Phenological, pomological and yield analyses were performed and variations of fruit development period, fruit size, polarimetric dry matter (Brix), total acidity, yield and other traits were determined. Two years of results for important traits are given for 12 promising genotypes. Fruit development period varied between 148 and 167 days, fruit weight 25.2 and 41.2 g, Brix 16.3 and 22.6% and total acidity 0.56 and 1.25%.

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Heritability, Genetic and Phenotypic Correlations, and Predicted Selection Response of Quantitative Traits in Peach: II. An Analysis of Several Fruit Traits

Journal of the American Society for Horticultural Science ◽

10.21273/jashs.123.4.604 ◽

1998 ◽

Vol 123 (4) ◽

pp. 604-611 ◽

Cited By ~ 47

Author(s):

Valdomiro A.B. de Souza ◽

David H. Byrne ◽

Jeremy F. Taylor

Keyword(s):

Fruit Development ◽

Fixed Effects ◽

Prunus Persica ◽

Genetic Correlations ◽

Soluble Solids ◽

Direct Selection ◽

Multiple Trait ◽

Phenotypic Correlations ◽

Development Period ◽

Genetic And Phenotypic Correlations

Thirteen peach [Prunus persica (L.) Batsch] fruit characteristics were investigated for 3 years, 1993, 1994, and 1995, in College Station, Texas, to determine heritability, genetic and phenotypic correlations, and predicted response to selection. Seedlings of 108 families resulting from crosses among 42 peach cultivars and selections were used in the evaluations. A mixed linear model, with years treated as fixed and additive genotypes as random factors, was employed to analyze the data. Best linear unbiased prediction (BLUP) was used to estimate fixed effects. Restricted maximum likelihood (REML) was used to estimate variance components, and a multiple trait model was used to estimate genetic and phenotypic covariances between traits. Genetic and phenotypic correlations ≥0.65 and <0.30 were considered strong or very strong and weak, respectively. Date of ripening, fruit development period (FDP) and date of full bloom had the highest heritability (h2) estimates, 0.94, 0.91, and 0.78, respectively. Fruit cheek diameter and titratable acidity (h2 = 0.31) were the traits with the lowest estimates. Fruit development period, fruit blush, and date of ripening had the highest predicted selection responses, whereas fruit suture, fruit cheek, L/W12 (ratio fruit length to average fruit diameters), and fruit tip had the lowest values. Most genetic correlations were ≥0.30 and were, in general, much higher than the corresponding phenotypic correlations. All four measures of fruit size were genetically and phenotypically very strongly correlated. Important genetic correlation estimates were also observed for date of ripening with FDP (ra = 0.93), date of ripening and FDP with fruit blush (ra = -0.77, ra = -0.72), SS (percent soluble solids) (ra = 0.63, ra = 0.62) and TA (ra = 0.55, ra = 0.64), and SS with TA (ra = -0.56). Direct selection practiced solely for early ripening and short FDP is expected to have a greater effect on correlated traits than direct selection for early bloom and large fruit mass.

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Hydrogen Cyanamide Accelerates Vegetative Budbreak and Shortens Fruit Development Period of Blueberry

HortScience ◽

10.21273/hortsci.37.3.539 ◽

2002 ◽

Vol 37 (3) ◽

pp. 539-542 ◽

Cited By ~ 9

Author(s):

Jeffrey G. Williamson ◽

Gerard Krewer ◽

Brian E. Maust ◽

E. Paul Miller

Keyword(s):

Fruit Development ◽

Leaf Development ◽

Fruit Size ◽

Field Trials ◽

Vaccinium Corymbosum ◽

Flower Bud ◽

Hydrogen Cyanamide ◽

South Georgia ◽

Development Period ◽

Southern Highbush

Experiments were conducted in north Florida and south Georgia to determine the effects of H2CN2 sprays on vegetative and reproductive growth of blueberry. In Florida, mature, field-grown `Misty' southern highbush (Vaccinium corymbosum L. hybrid) blueberry plants were sprayed to drip with 0, 10.2, or 20.4 g·L-1 of H2CN2 [hereafter referred to as 0%, 1.0%, and 2.0% (v/v) H2CN2] on 20 Dec. 1996 and 7 Jan. 1997. During the following winter, mature `Misty' southern highbush and `Climax' rabbiteye (V. ashei Reade) plants were sprayed to drip with 0, 7.6, or 15.3 g·L-1 of H2CN2 [hereafter referred to as 0%, 0.75%, and 1.5% (v/v) H2CN2] on 17 Dec. 1997 and 6 Jan. 1998. For all experiments, plants were dormant and leafless, with slightly swollen flower buds, at the time of spray applications. Generally, H2CN2 sprays increased the extent and earliness of vegetative budbreak and canopy establishment and advanced flowering slightly. The number of vegetative budbreaks usually increased linearly with increasing spray concentrations. In Florida, H2CN2 [0.75% to 1.0% (v/v)] sprays increased mean fruit fresh weight and yield, and shortened the fruit development period (FDP) compared to controls. However, H2CN2 sprays ranging in concentration from 1.5% to 2.0% (v/v) resulted in significant flower bud injury and reduced total fruit yield compared to controls. In south Georgia, 27 of 37 field trials conducted between 1991 and 1998 on several rabbiteye and southern highbush cultivars indicated that leaf development was significantly enhanced by H2CN2. H2CN2 shows potential for increasing early fruit maturity, fruit size, and yield of southern highbush and rabbiteye blueberry cultivars with poor leaf development characteristics in low-chill production regions. Chemical name used: hydrogen cyanamide (H2CN2).

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