Influence of the Period of Peach Tree Chemical Thinning on Fruit Quality

Barreto, Caroline Farias; Farias, Roséli de Mello; Zandoná, Renan Ricardo; Martins, Carlos Roberto; Malgarim, Marcelo Barbosa

doi:10.5539/jas.v11n14p141

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…However, SSC and TA did not consistently differ between different thinning times and intensities. This is consistent with previous reports indicating inconsistent or minor effects of thinning treatments on fruit SSC [12,41,49,50]. Altogether, thinning times and intensities did not consistently affect fruit flavor in this study.…”

Section: Discussionsupporting

confidence: 93%

Optimizing Fruit-Thinning Strategies in Peach (Prunus persica) Production

et al. 2020

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Fruit size is a highly valued commercial trait in peach. Competition among fruit and among other sinks on a tree reduces potential growth rate of the fruit. Hence, crop-load management strategies such as thinning (removal of flowers or fruit) are often practiced by growers to optimize fruit size. Thinning can be performed at bloom or during early fruit development and at different intensities to optimize fruit growth responses. Responses to thinning may be cultivar and location specific. The objective of the current study was to fine-tune thinning strategies in the southeastern United States, a major peach producing region. Timing and intensity of thinning were evaluated across multiple cultivars over three years. Thinning at bloom or at 21 d after full bloom (DAFB) improved fruit size in comparison to unthinned trees in ‘Cary Mac’ and ‘July Prince’, respectively, in one year. Bloom-thinning reduced fruit yield (kg per tree) in the above cultivars in one year, suggesting that flower thinning alone may not be a viable option in this region. Intensity of thinning, evaluated as spacings of 15 cm and 20 cm between fruit, did not differentially affect fruit weight or yield. However, fruit diameter decreased quadratically with increasing fruit number per tree in ‘Cary Mac’, ‘July Prince’ and ‘Summer Flame’. Similarly, fruit weight decreased quadratically in response to increase in fruit number per tree in ‘Cary Mac’ and ‘July Prince’. Further, yield-per-tree decreased with increasing fruit size in ‘Cary Mac’ and ‘July Prince’. Importantly, these relationships were cultivar specific. Together, the data suggest that achieving a target fruit number per tree is an effective strategy for crop-load management to optimize fruit size in southeastern peach production. The target fruit number per tree may potentially be achieved through a combination of flower and fruit-thinning during early fruit development. Such an approach may provide flexibility in crop-load management in relation to adverse weather events.

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Section: Discussionsupporting

confidence: 93%

Optimizing Fruit-Thinning Strategies in Peach (Prunus persica) Production

et al. 2020

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“…Regarding the firmness and dry matter, “Morsiani 90” dis-played the highest values—5.75 kg/cm 2 and 20.72%. Higher firmness means greater transport stability and longer life after harvest [ 33 ]. The values were a little bit higher than the results reported by Aubert and Chalot [ 34 ] who found a variation of dry matter content in 14 cultivars in the range from 10.5 to 18.0%.…”

Section: Resultsmentioning

confidence: 99%

Comprehensive Evaluation of Late Season Peach Varieties (Prunus persica L.): Fruit Nutritional Quality and Phytochemicals

et al. 2021

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Peaches are one of the most preferred seasonal fruits, and a reliable source of nutrients. They possess biologically active substances that largely differ among varieties. Hence, revealing the potential of several late season peaches is of present interest. Three commonly consumed varieties (“Flat Queen”; “Evmolpiya”; “Morsiani 90”) were studied in terms of nutritive and phytochemical content, as well as antioxidant activity with the use of reliable spectrophotometric and High Performance Liquid Chromatographic (HPLC) methods. An analysis of the soil was also made. The phytochemical data were subjected to principal component analysis in order to evaluate their relationship. The “Morsiani 90” variety had the highest minerals concentration (2349.03 mg/kg fw), total carbohydrates (16.21 g/100 g fw), and α-tocopherol (395.75 µg/100 g fresh weight (fw)). Similar amounts of TDF (approx. 3 g/100 g fw) were reported for all three varieties. “Flat Queen’s” peel extract was the richest in monomeric anthocyanins (2279.33 µg cyanidin-3-glucoside (C3GE)/100 g fw). The “Morsiani 90” variety extracts had the highest antioxidant potential, defined by 2,2-diphenil-1-picrylhydrazyl (DPPH), ferric-reducing antioxidant power (FRAP) and cupric ion-reducing antioxidant capacity (CUPRAC) assays.

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