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ISHS Acta Horticulturae 1277: XII International Rubus and Ribes Symposium: Innovative Rubus and Ribes Production for High Quality Berries in Changing Environments

Effects of harvest time (7:00 am and 12:00 pm) on postharvest quality of Arkansas fresh-market blackberries

Authors:   M. Felts, R.T. Threlfall, J.R. Clark, M.L. Worthington
Keywords:   marketability, Rubus, composition, shelf-life, red drupelet reversion, decay, firmness
DOI:   10.17660/ActaHortic.2020.1277.68
Abstract:
Postharvest marketability of fresh-market blackberries (Rubus subgenus Rubus Watson) relies on the capacity of fruit to maintain firmness and resist leakage, decay, and development of red drupelet reversion before reaching consumers. Five cultivars (‘Caddo’, ‘Natchez’, ‘Osage’, ‘Ouachita’, and ‘Prime-Ark® Traveler’) and four advanced breeding selections were harvested in 2017 from the University of Arkansas System Division of Agriculture Fruit Research Station, Clarksville, AR at 7:00 am and 12:00 pm Berries were evaluated for physicochemical attributes at harvest (day 0) and physicochemical and marketability attributes after 7 and 14 d at 10°C. At harvest, berries of these genotypes had soluble solids of 7.4-11.0%, pH of 2.5-3.5, and titratable acidity of 0.7-1.3%. There were no significant interactions for decay, and decay was not impacted by harvest time or genotype. Decay was 0, 35.4 and 70.0% after 0, 7, and 14 d, respectively. There were significant interactions for the other attributes. During postharvest storage, A-2444 had the highest incidence of weight loss (9.5%) when harvested at 12:00 pm whereas A-2526 had the lowest weight loss when harvested at 12:00 pm (4.5%). At the 7:00 am harvest, ‘Prime-Ark® Traveler’ was the firmest (6.9 N), and ‘Caddo’ was the least firm (3.9 N). There was a significant interaction for genotype × storage day × harvest time for red drupelet reversion. Except for ‘Natchez’, red drupelet reversion during storage was not significantly affected by harvest time. In general, harvest time had a minimal impact on blackberry marketability during storage. At 14 days of storage regardless of harvest time, A-2526 had the least weight loss, ‘Osage’ had the least leakage, APF-268 had the least decay, and A-2453 had the least red drupelet reversion and was the firmest. Multi-year studies should be done to investigate harvest time impact on postharvest quality of Arkansas grown fresh-market blackberries.

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