Effects of growth regulators and bunch trimming on size, maturity and yield of sultana grapes

1970 ◽  
Vol 10 (45) ◽  
pp. 474 ◽  
Author(s):  
RS Sproule ◽  
MC Stannard
Keyword(s):  
Gibberellic Acid ◽  
Growth Regulators ◽  
Total Yield ◽  
Fresh Fruit ◽  
Full Bloom ◽  
Berry Size ◽  
Normal Shape ◽  
Berry Set

Three experiments were done over two seasons on the effect of gibberellic acid (GA) and parachlorophenoxyacetic acid (PCPA) sprays and bunch trimming on the yield, berry characters, maturity, and bunch quality of sultanas. GA applied at the shatter stage at 10 p.p.m. increased berry size and bunch quality of fresh fruit. When applied at full bloom, berry size was increased and earlier maturity was induced but berry set and yield were reduced. If applied at commencement of bloom. GA caused considerable thinning and the bunches were unattractive. Splitting the application into two 5 p.p.m. applications at commencement and full bloom was also unsatisfactory. A combined spray of PCPA and GA at shatter stage retarded maturity but increased berry size and yield over GA alone. It was shown that PCPA should be applied separately several days after shatter to avoid retention of shoe bellies. GA increased berry size mainly by elongation. Addition of PCPA produced larger berries of more normal shape. Bunch trimming decreased total yield of most treatments, but did not increase quantity of marketable fresh fruit. However, in general, berry length, diameter, and weight were increased by trimming. The importance of thorough wetting of the bunches by gibberellic acid sprays was demonstrated in a dipping experiment.

scholarly journals Gibberellic Acid Applied at Bloom Reduces Fruit Set and Improves Size of 'Crimson Seedless' Table Grapes

HortScience ◽  
2001 ◽  
Vol 36 (4) ◽  
pp. 706-709 ◽  
Author(s):  
N.K. Dokoozlian ◽  
W.L. Peacock
Keyword(s):  
Gibberellic Acid ◽  
Fruit Set ◽  
Single Application ◽  
Full Bloom ◽  
Cluster Number ◽  
Application Timing ◽  
Table Grapes ◽  
Berry Size ◽  
Bunch Rot

Excessive fruit set can reduce the quality of 'Crimson Seedless' table grapes (Vitis vinifera L.), resulting in compact, tightly filled clusters with small berries that are prone to bunch rot at harvest. Two separate studies were conducted to examine the effects of application timing and rate on the efficacy of GA3 for berry thinning. In the first experiment, vines were treated with 2 g·ha-1 GA3 at one of the following stages of bloom: 1% to 5%; 20% to 30%; 50% to 60%; 80% to 90%; or 100% capfall (falling of the calyptra). The second experiment compared treatments of 0, 2.5, 6.25, 12.5, 18.75, or 25 g·ha-1 GA3 applied at ≈80% bloom. Fruit set (number of berries/cm shoulder length) was similar among vines treated between 1% to 5% and 100% bloom with 2 g·ha-1 GA3, although berry set was reduced relative to the control. However, applications made during the later stages of bloom significantly increased berry length and weight. Fruit set generally declined, and the number of shot berries per cluster increased, as the amount of GA3 applied at bloom increased. Applications ≥6.25 g·ha-1 GA3 resulted in commercially unacceptable levels of shot berries, as well as significant reductions in cluster weight and packable yield per vine. The results indicate that a single application of 2.5 g·ha-1 GA3 near full bloom may be used to reduce fruit set and increase berry size of this cultivar without detrimental effects on packable yield or cluster number per vine the subsequent year. Chemical name used: gibberellic acid (GA3).

Influence of gibberellic acid and N6-benzyladenine on the development of seed and shot berries in the seedless grape (Vitis vinifera L.) cv. Perlette

2005 ◽  
Vol 56 (5) ◽  
pp. 497
Author(s):  
K. Usha ◽  
D. Kashyap ◽  
B. Singh
Keyword(s):  
Gibberellic Acid ◽  
Fruit Set ◽  
Vitis Vinifera L ◽  
High Concentration ◽  
Full Bloom ◽  
Seed Formation ◽  
Table Grapes ◽  
Yield And Quality ◽  
Seedless Grape

Gibberellins have been used to improve quality of grapes in several cases. However, gibberellic acid (GA) alone is not enough to improve the quality in Perlette. A field experiment was conducted on 3-year-old grape cv. Perlette trained on pergolas, to investigate the effect of bunch dipping with GA3 and N6-benzyladenine (BA) on reducing the problem of shot berries and improving the productivity of grapevines. Our observations proved that the stage of application of GA3 and BA is crucial to avoiding seed formation in seedless varieties such as Perlette for table grapes. The results showed that BA at low (10 µL/L) or high concentration (30 µL/L) at 50% of full bloom caused seed development in the seedless grape cv. Perlette, whereas no seed was formed when BA was used later at the fruit set stage. Based on our studies, we found that bunch dipping with 30 µL/L GA3 (at 50% of full bloom) and 10µL/L BA (at pea size) significantly reduced the problem of shot berries, and improved the yield and quality in grape cv. Perlette.

scholarly journals Response of Rabbiteye Blueberry (Vaccinium ashei Reade) to the Growth Regulators CPPU and Gibberellic Acid

HortScience ◽  
2002 ◽  
Vol 37 (4) ◽  
pp. 666-668 ◽  
Author(s):  
D. Scott NeSmith
Keyword(s):  
Gibberellic Acid ◽  
Growth Regulator ◽  
Fruit Set ◽  
Total Yield ◽  
Control Treatment ◽  
Single Application ◽  
Treatment Results ◽  
Vaccinium Ashei ◽  
Berry Size ◽  
Mature Field

Experiments were conducted during 1999 and 2000 at Griffin, Ga., with rabbiteye blueberries (Vaccinium ashei Reade) to determine how the growth regulator CPPU affected fruit set, berry size, and yield. CPPU (applied at two different timings) was used alone, and in conjunction with GA3 on mature, field-grown `Tifblue' plants. A control treatment without either growth regulator was also included. The CPPU concentration used was 10 mg·L-1 (a single application per treatment), and the GA3 concentration used was 200 mg·L-1 (two applications per treatment). Results from both years showed a positive benefit of CPPU with respect to fruit set and berry size, especially in the absence of GA3. Depending on timing, berry number per plant was increased by more than 200% in 1999 using CPPU. Berry size increases of more than 30% occurred in 2000 when CPPU alone was applied at 17 d after flowering (DAF). CPPU did not increase berry size of GA3-treated plants in either year. Total yield per plant during 2000 was 5.0, 7.1, and 8.3 kg for control, CPPU applied 7 DAF, and CPPU applied 17 DAF treatments, respectively, without GA3. While CPPU did substantially increase fruit set, berry size, and yield of `Tifblue', there was a notable delay in fruit ripening. These results suggest that CPPU may be useful for increasing yield of rabbiteye blueberries under conditions of inadequate fruit set (such as occurs in much of the Southeast), but a delay in ripening will likely result. Chemical names used: N-(2-chloro-4-pyridyl)-N′-phenylurea (CPPU); gibberellic acid (GA3).

SOME CLUSTER THINNING AND GIBBERELLIC ACID EFFECTS ON FRUIT SET, BERRY SIZE, VINE GROWTH AND YIELD OF DE CHAUNAC GRAPES

1977 ◽  
Vol 57 (3) ◽  
pp. 653-659 ◽  
Author(s):  
N. E. LOONEY ◽  
D. F. WOOD
Keyword(s):  
Gibberellic Acid ◽  
Fruit Set ◽  
Growth And Yield ◽  
Vine Growth ◽  
Berry Weight ◽  
Berry Size ◽  
Cluster Thinning ◽  
Berry Set

De Chaunac grapes were thinned to one- and two-flower clusters per fruitful shoot, cluster-pruned by removing part of the flower cluster of two clusters per shoot and/or sprayed with 50 ppm gibberellic acid (GA3) 10 days after bloom. A low to moderate vigor vineyard was treated in 1974 and a high vigor vineyard treated in 1975. GA3 enhanced berry weight in both trials, the greatest effect being on berries in more distal clusters. GA3 did not affect berry set. Thinning to one cluster reduced yield in both tests. Thinning to two clusters coupled with cluster pruning reduced yield in the high vigor block. Berry set was enhanced by thinning to one cluster in the vigorous block and by cluster pruning in both trials. Individual berry weight was increased by thinning in 1974 and by thinning plus GA3 in 1975. Thinning to one cluster coupled with GA3 treatment increased vine growth in both experiments.

scholarly journals Sprouting Temperature and Growth Regulators Influence Cut Flower Quality of Sandersonia aurantiaca

HortScience ◽  
1998 ◽  
Vol 33 (7) ◽  
pp. 1167-1171 ◽  
Author(s):  
Lindsay J. Davies ◽  
Ian R. Brooking ◽  
Jocelyn L. Catley ◽  
Elizabeth A. Halligan
Keyword(s):  
Gibberellic Acid ◽  
Growth Regulators ◽  
Stem Length ◽  
Cut Flower ◽  
Flower Stem ◽  
Stem Quality ◽  
Temperature And Growth ◽  
Flower Quality ◽  
Cut Flower Quality

Tubers of Sandersonia aurantiaca Hook. were soaked in 1000 mg·L-1 GA3, 20 mg·L-1 uniconazole, 200 mg·L-1 benzyladenine, or water for 2 hours and then sprouted at 12, 18, or 24 °C. The effects of these treatments on flower stem quality were then determined at forcing temperatures of 18, 24, or 30 °C. Stem length increased with sprouting temperature only at a forcing temperature of 18 °C. Floret numbers increased with sprouting temperature at all forcing temperatures, but the effect was greatest at the 18 °C forcing temperature. The 12 °C sprouting treatment reduced floret numbers at all forcing temperatures. Soaking tubers in GA3 increased stem length but drastically reduced floret numbers, while soaking in uniconazole reduced stem length but had no significant effect on floret numbers. Soaking in BA strongly promoted branching, which resulted in large increases (>30%) in floret numbers per stem with little change in stem length. Of the three growth regulators, only BA was effective in improving cut flower stem quality. Chemical names used: gibberellic acid (GA3); (E)-(+)-(S)-(4-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)-pent-1-ene-3 -ol (uniconazole); N6-benzylamino purine (benzyladenine; BA).

scholarly journals Regulating yield and wine quality of minimal prunning systems through the application of gibberellic acid

OENO One ◽  
2006 ◽  
Vol 40 (3) ◽  
pp. 151
Author(s):  
Karsten M. Weyand ◽  
Hans Reiner Schultz
Keyword(s):  
Gibberellic Acid ◽  
Total Yield ◽  
Titratable Acidity ◽  
Wine Quality ◽  
Berry Weight ◽  
Berry Size ◽  
Quality Aspects ◽  
Shoot Number ◽  
Commercial Yield ◽  
Sugar Levels

<p style="text-align: justify;">The use of gibberellic acid to increase berry size and to loosen up bunches in the production of seedless table grape varieties has a long history. The use of gibberellic acid on wine grapes, however, is very limited, mainly because some varieties can show substantial losses in bud fertility and thus in commercial yield. We tried to exploit the feature of decreases in bud fertility as a response to gibberellic acid applications (in the form of GA3) to regulate yield and quality aspects of minimally pruned (MP) White Riesling grapevines where other thinning methods have failed. Single applications of 50 mg L-1 GA3 at 500 L ha-1 were used during full bloom in each year from 2002-2004 (MP GA3-02/03/04) in one MP treatment, while the second MP treatment received no GA3 in 2003 (MP GA3-02/04). Treatments were compared with untreated MP vines and with a standard pruned, vertically shoot positioned system (VSP). GA3 applications reduced inflorescence number by about 30-50% the year following treatment, while shoot number remained unchanged. GA3 treated MP vines responded to this type of « thinning » by a 10-28 % increase in berry weight. Total yield of MP vines was reduced by 26-49% the year after first time application approaching VSP yield. Yield of the continuously treated vines (MP GA3-02/03/04) remained comparable to pruned VSP vines up to now (harvest 2005) (about 9-13 tons per ha). Discontinuing the GA3 treatment for one year caused yield to re-approach the one of untreated MP vines the next year. Despite of the increase in berry weight, bunch structure remained less compact as compared to VSP fruit. Sugar levels at harvest of vines treated with GA3 the previous year were similar to sugar levels of VSP vines and superior to untreated MP vines. We found no treatment effect on glycosyl-glucose (bound secondary metabolites, GG) concentration but a slight increase in phenols and titratable acidity the year after GA3 treatment. Sensory evaluation of the resulting wines revealed no or only minimal differences with a slight preference for the least yielding VSP and MP GA3-02/03/04 wines. The outlined strategy seems promising for the production of quality fruit in a highly economic viticultural system.</p>

Corrigendum to: Influence of gibberellic acid and N6-benzyladenine on the development of seed and shot berries in the seedless grape (Vitis vinifera L.) cv. Perlette

2005 ◽  
Vol 56 (9) ◽  
pp. 1009
Author(s):  
K. Usha ◽  
D. Kashyap ◽  
B. Singh
Keyword(s):  
Gibberellic Acid ◽  
Fruit Set ◽  
Vitis Vinifera L ◽  
High Concentration ◽  
Full Bloom ◽  
Seed Formation ◽  
Table Grapes ◽  
Yield And Quality ◽  
Seedless Grape

Gibberellins have been used to improve quality of grapes in several cases. However, gibberellic acid (GA) alone is not enough to improve the quality in Perlette. A field experiment was conducted on 3-year-old grape cv. Perlette trained on pergolas, to investigate the effect of bunch dipping with GA3 and N6-benzyladenine (BA) on reducing the problem of shot berries and improving the productivity of grapevines. Our observations proved that the stage of application of GA3 and BA is crucial to avoiding seed formation in seedless varieties such as Perlette for table grapes. The results showed that BA at low (10 �L/L) or high concentration (30 �L/L) at 50% of full bloom caused seed development in the seedless grape cv. Perlette, whereas no seed was formed when BA was used later at the fruit set stage. Based on our studies, we found that bunch dipping with 30 �L/L GA3 (at 50% of full bloom) and 10�L/L BA (at pea size) significantly reduced the problem of shot berries, and improved the yield and quality in grape cv. Perlette.

scholarly journals Post-harvest longevity of leaves of the sea lavender (Limonium latifolium (Sm.) Kuntze) after application of growth regulators

2013 ◽  
Vol 40 (No. 4.) ◽  
pp. 172-176
Author(s):  
B. Janowska ◽  
R. Grabowska ◽  
E. Ratajczak
Keyword(s):  
Gibberellic Acid ◽  
Growth Regulators ◽  
Ornamental Plants ◽  
Favourable Effect ◽  
Distilled Water ◽  
Post Harvest ◽  
Conditioning Treatment ◽  
Sea Lavender ◽  
Leaf Greenness

Conditioning is a simple and effective method of post-harvest longevity of both flowers and florists&rsquo; greens. Performing this treatment immediately after harvest by the producer increases the quality of floral products expressed as their post-harvest longevity. The purpose of this study was to assess the influence of four growth regulators from the gibberellin and cytokinin groups applied as a 4-h conditioning treatment of leaf blades and to determine any effects on post-harvest longevity of leaves of Limonium latifolium. The leaves were harvested early in the morning from the department of ornamental plants collection. Selected leaves were fully-developed and had no damage or discolouring. Gibberellic acid, benzyladenine, meta- methoxytopolin and its riboside at the concentrations of 25, 50 and 75 mg/dm<sup>3 </sup>were taken up in a solution for 4-h leaf-conditioning of Limonium latifolium at the temperature of 18&ndash;20&deg;C. After the conditioning treatment the leaves were placed in distilled water. Leaves placed into distilled water immediately after cutting served as control. Gibberellic acid, benzyladenine and topolins applied as leaf conditioning treatment extended the post-harvest longevity of leaves of Limonium latifolium. Examined growth regulators, with the exception of riboside of meta-methoxytopolin, also had a favourable effect on the index of leaf greenness.

Effect of some growth regulators on yield and quality of sweetmelon and muskmelon

1982 ◽  
Vol 98 (3) ◽  
pp. 645-649 ◽  
Author(s):  
E. El-Kholy ◽  
H. Hafez ◽  
F. Naeem
Keyword(s):  
Growth Regulators ◽  
Indole Acetic Acid ◽  
Total Yield ◽  
Fruit Weight ◽  
Soluble Solids ◽  
Ascorbic Acid Concentration ◽  
Yield And Quality ◽  
Yield Quality ◽  
Better Than

SUMMARYThis study was carried out at Elminia University farm in two years (1978 and 1980) to evaluate the effect of some growth regulators on the production of sweetmelon and muskmelon. It was found that plants treated with some growth regulators were earlier and yielded better than untreated ones, except that in the first trial (1978), the total yield of plants treated with indole acetic acid (IAA) was less than that of the control. The highest early and total yields of both sweetmelon and muskmelon resulted from spraying ethrel on the foliage. Fruit weight and length and flesh thickness were increased by some growth substances compared with the control for both crops. Also, percentage of total soluble solids and ascorbic acid concentration increased markedly as a result of growth-regulator treatments for sweetmelon and muskmelon. Generally, two sprays of ethrel solution produced the most consistent effects on yield and yield quality in the two trials with both sweetmelon and muskmelon.

scholarly journals Techniques to modify cluster architecture and their effect on the viticultural performance of the Sauvignon Blanc cultivar

2020 ◽  
Vol 55 ◽  
Author(s):  
Alberto Fontanella Brighenti ◽  
Bruno Munhoz ◽  
Douglas André Würz ◽  
Mateus da Silveira Pasa ◽  
Felipe Augusto Moretti Ferreira Pinto ◽  
...  
Keyword(s):  
Gibberellic Acid ◽  
Vitis Vinifera ◽  
Full Bloom ◽  
Sauvignon Blanc ◽  
Cluster Architecture ◽  
Yield And Quality ◽  
Cluster Compactness ◽  
Bunch Rot ◽  
Prohexadione Calcium

Abstract: The objective of this work was to evaluate the effect of different techniques to modify grape cluster architecture on the incidence and severity of botrytis bunch rot, as well as on the viticultural performance of the 'Sauvignon Blanc' grapevine (Vitis vinifera). Associated with fungicides, four treatments were tested: control, 30 ppm gibberellic acid sprayed at full bloom, 1,000 ppm prohexadione calcium sprayed at full bloom, and berry thinning at the stage of beginning of berry touch. The experiment was carried out in the 2015, 2016, and 2017 vintages. Clusters were treated with fungicides during the stages of full bloom, beginning of berry touch, veraison, and around 15 days before harvest. Berry thinning does not cause losses in the yield and quality of 'Sauvignon Blanc', and, despite having little effect on cluster architecture, is effective in reducing the incidence and severity of Botrytis cinerea. Prohexadione calcium improves grape phenolic maturation, is effective in reducing the incidence and severity of B. cinerea, and reduces cluster compactness by decreasing berry diameter. The application of gibberellic acid spray at full bloom is not recommended because it decreases yield and bud fertility and increases berry susceptibility to B. cinerea infection.

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