Effects of 2,4-D and related substances on fruit-drop, yield, size, and quality of Valencia oranges

Stewart, William S.; Hield, H; Brannaman, B. L.

doi:10.3733/hilg.v21n11p301

Cited by 20 publications

(9 citation statements)

References 7 publications

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“…No varietal difference could be observed in the shape of the grooves between 'Hôi' and 'Tròn'; however, it was shown that 'Hôi' with a bigger fruit size, had an increased fruit pedicel thickness compared to 'Tròn', which represents a cultivar specific feature. This was also observed in several citrus cultivars, where pedicel diameter was also linked to fruit size (Bustan et al, 1995;El-Otmani et al, 1993;Stewart et al, 1952). The AZ of tightly packed small cell rows and the transition from AZ cortex cells (AZ-cc) to neighbouring tissue is clearly distinguishable.…”

Section: Morpho-physiological Changes In the Abscission Zone Of Mangomentioning

confidence: 53%

“…Carbohydrate: It was shown that 'Hôi' had an increased fruit pedicel thickness compared to 'Tròn', which might be linked to bigger fruit size and represents a cultivar specific feature between both cultivars. Similarly, it was observed in several citrus cultivars, where pedicel diameter was also linked to fruit size (Bustan et al, 1995;El-Otmani et al, 1993;Stewart et al, 1952). Relationship between fruit set and carbohydrate availability are reported for several fruit trees, including mango (Chacko, 1991).…”

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confidence: 57%

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Possible Physiological Mechanisms of Premature Fruit Drop in Mango (Mangifera Indica L.) in Northern Vietnam

Roemer¹,

Hegele²,

Wünsche³

et al. 2011

Acta Hortic.

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Section: Morpho-physiological Changes In the Abscission Zone Of Mangomentioning

confidence: 53%

mentioning

confidence: 57%

Possible Physiological Mechanisms of Premature Fruit Drop in Mango (Mangifera Indica L.) in Northern Vietnam

Roemer¹,

Hegele²,

Wünsche³

et al. 2011

Acta Hortic.

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“…was much less in the treated fruit and they kept longer, while the untreated fruits were all either desiccated or diseased. At the end of 5 weeks' storage, as many as 48-61% of the treated fruits in treatments (2), (4), ( 5 ) and (6) were still marketable (Table 111). At harvest, all the treated lots of fruits showed increased respiration (Fig.…”

Section: Resultsmentioning

confidence: 99%

Effect of preharvest spray of plant growth regulators on size, composition and storage behaviour of coorg mandarins [Citrus reticulata (blanco)]

Rodrigues

Subramanyam

1966

J Sci Food Agric

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Mandarin orange trees bearing the monsoon crop* were sprayed with CLPA and 2,4,5-T and NOA 8 weeks before harvest. Fruits treated with 2,4,5-T (25 and 50 pprn) and CLPA (25 pprn) had 34, 35 and 28"/, more weight, respectively, than the control and also had higher percentage of juice and reduced pomace content with a corresponding increase in peel moisture. When stored for 35 days at 4 2 4 5 "~ and 85-90% R.H., the treated fruits suffered less physiological loss in weight, a greater percentage of them being in marketable condition as compared with the untreated ones. The vitamin C loss also was much less during storage. The treatments had little effect on respiratory activity, although there was a peak on the fourteenth day of storage, possibly a respiratory climacteric.

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“…Applying synthetic auxins during the cell division stage of fruit development significantly reduces the number of fruits and increases the final fruit size by reducing the competition for carbohydrates between fruitlets (Agustı´et al 1995). Synthetic auxins such as 2,4-dichlorophenoxy acetic acid (2,4-D), 2,4,5-trichlorophenoxy acetic acid (2,4,5-T), naphthalene acetic acid (NAA) and 2,4-dichlorophenoxypropionic acid (2,4-DP) have been shown to increase fruit size (Stewart et al 1952;El-Zeftawi 1976;Guardiola et al 1988;El-Otmani et al 1993;Agustıé t al. 1994).…”

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confidence: 99%

Effects of 2,4-DP (2,4-dichlorophenoxypropionic acid) plant growth regulator on fruit size and yield of Valencia oranges (Citrus sinensisOsb.)

Yıldırım

Yeşiloğlu

İncesu

et al. 2012

New Zealand Journal of Crop and Horticultural Science

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The Valencia orange is a high-quality fruit grown in Turkey; however, small fruit sizes and high fruit discard percentages are common in Valencia oranges. Small fruit size is the main factor limiting the marketing of Valencia oranges; thus, synthetic auxins are commonly used to enhance the size of citrus fruit. The objective of the present study was to observe the effects of 2,4-dichlorophenoxypropionic acid (2,4-DP) on the fruit size, yield and quality of Valencia oranges from 29-year-old trees budded on sour orange rootstock in Adana, Turkey during 2005Á06. Three concentrations (50, 100 and 150 ppm) of 2,4-DP were applied during the June drop, when the mean fruit diameter was 13Á15 mm. The results indicated that the application of 2,4-DP increased the fruit size of Valencia oranges without reducing yield. The application had a significant effect on fruit yield. Compared with the control trees, applications of 2,4-DP increased the number of large, commercially valuable Valencia oranges (75Á80 mm). Moreover, an increase in the concentration of 2,4-DP increased the yield and weight of the fruits. As a result, fruit retention was highest in trees sprayed with 150 ppm 2,4-DP. Except for the titratable acid content (TA), which increased with an increase in the 2,4-DP concentration, the internal characteristics of the fruit were not affected by treatment with 2,4-DP. Thus, the results of the present study revealed that 2,4-DP can be used to improve the fruit size of Valencia fruitlets during the June drop.

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Effects of 2,4-D and related substances on fruit-drop, yield, size, and quality of Valencia oranges

Cited by 20 publications

References 7 publications

Possible Physiological Mechanisms of Premature Fruit Drop in Mango (Mangifera Indica L.) in Northern Vietnam

Possible Physiological Mechanisms of Premature Fruit Drop in Mango (Mangifera Indica L.) in Northern Vietnam

Effect of preharvest spray of plant growth regulators on size, composition and storage behaviour of coorg mandarins [Citrus reticulata (blanco)]

Effects of 2,4-DP (2,4-dichlorophenoxypropionic acid) plant growth regulator on fruit size and yield of Valencia oranges (Citrus sinensisOsb.)

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