Plant growth regulators on the pre-harvest period of 'Pêra' oranges

Almeida, Isolina Maria Leite de; Ono, Elizabeth Orika; Rodrigues, João Domingos

doi:10.1590/s0103-84782008000300011

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…For instance, the application of 3,4,5-TPA was found to increase the total acid content of Fina clementine mandarins; however, significant differences in the acid concentration were not observed due to an increase in the volume of juice (Agustı´et al 1995). Nevertheless, except for titratable acidity, major internal fruit characteristics were not affected by auxin treatments, as previously observed by other researchers (Coggins 1981;Lima & Davies 1984;Pons et al 1992;Davies et al 1999;Agustı2 000;Pozo et al 2000;Saraswathi et al 2003;Almeida et al 2008). …”

Section: Discussionsupporting

confidence: 68%

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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Section: Discussionsupporting

confidence: 68%

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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show abstract

“…The major internal fruit quality, including rind thickness, juice content, total soluble solids, total acid and ascorbic acid, were generally not affected by 2,4-DP-P treatments, as previously observed by other researchers (Davies et al, 1999;Agusti, 2000;Pozo et al, 2000;Saraswathi et al, 2003;Almeida et al, 2008;Yazıcı et al, 2016;Ferrer et al, 2017).…”

Section: Discussionsupporting

confidence: 83%

Effects of 2,4-DP- P (2,4-Dichlorophenoxypropionic Acid-P) Plant Growth Regulator on Fruit Size and Yield of Star Ruby Grapefruit (Citrus paradisi Osb.)

Yılmaz

Çimen

Yeşiloğlu

et al. 2018

Turkish JAF Sci.Tech.

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Star Ruby is the main grapefruit (Citrus paradisi) variety grown in Turkey; however, small fruit size is a common problem in ‘Star Ruby’ grapefruit. Fruit size is a decisive external quality parameter in citrus at the marketing of fresh citrus fruits. Fruit size can be enhanced by several techniques such as girdling and thinning. Various plant growth regulators are known to affect the growth and size of citrus fruit. The objective of the present study was to observe the effects of 2,4 dichlorophenoxypropionic acid-p (2,4-DP-P) on the fruit size, yield and quality of Star Ruby from 20-year-old trees budded on sour orange rootstock in Adana, Turkey in 2007. Four concentrations (50, 100, 150 and 300 ppm) of 2,4-DP-P were applied 8 weeks after anthesis during physiological fruit drop when the mean fruit diameter was 13-15 mm. The results indicated that the application of 2,4-DP-P increased the fruit size of Star Ruby grapefruit without reducing yield. The application had a significant effect on fruit yield except for trees treated with 50 ppm 2,4-DP-P. Compared with the control trees, applications of 2,4-DP-P increased the number of large, commercially valuable Star Ruby (>93 mm, 89-93 mm and 84-89 mm). No effects were determined on fruit internal quality parameters. Thus, the results of the present study revealed that 2,4-DP-P can be used to improve the fruit size of Star Ruby fruitlets during the June drop.

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Plant growth regulators on the pre-harvest period of 'Pêra' oranges

Cited by 2 publications

References 6 publications

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

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

Effects of 2,4-DP- P (2,4-Dichlorophenoxypropionic Acid-P) Plant Growth Regulator on Fruit Size and Yield of Star Ruby Grapefruit (Citrus paradisi Osb.)

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