BMC Plant Biology
Edible dry beans (Phaseolus vulgaris L.) that darken during postharvest storage are graded lower and are less marketable than their non-darkened counterparts. Seed coat darkening in susceptible genotypes is dependent upon the availability of proanthocyanidins, and their subsequent oxidation to reactive quinones. Mature cranberry beans lacking this postharvest darkening trait tend to be proanthocyanidin-deficient, although the underlying molecular and biochemical determinants for this metabolic phenomenon are unknown.
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Freixas Coutin, José A.; Munholland, Seth; Silva, Anjali; Subedi, Sanjeena; Lukens, Lewis; Crosby, William L.; Pauls, K. Peter; and Bozzo, Gale G., "Proanthocyanidin accumulation and transcriptional responses in the seed coat of cranberry beans (Phaseolus vulgaris L.) with different susceptibility to postharvest darkening" (2017). BMC Plant Biology, 17, 89.