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Characterization of seed coat post harvest darkening in common bean (Phaseolus vulgaris L.)

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Seed coat post harvest darkening (PHD) represents a problem for producers and consumers of several market classes of dry bean. There are three PHD phenotypes: (1) non-darkening (ND), (2) slow darkening (SD) and (3) regular darkening (RD). The inheritance of PHD was elucidated by evaluating populations derived from crosses among multiple RD, SD and ND genotypes. Results indicate that at least two unlinked major genes control the PHD trait in common bean. Recessive epistasis with three phenotypic classes explains the segregation ratios of populations from crosses between SD and ND parents. One gene, J, is responsible for whether a bean will darken as seeds from plants that are jj do not darken at all. Another gene, sd, influences how quickly a seed coat will darken with sdsd individuals darkening more slowly than those with the dominant Sd allele.

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Financial assistance for this project from the following is gratefully acknowledged: the Robert P. Knowles Scholarship Fund (HE), the Saskatchewan Pulse Growers Association and the Ontario Coloured Bean Growers Association. The authors also thank the Pulse Crop field crew at the CDC, University of Saskatchewan and Angela Nierop for technical assistance.

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Correspondence to Kirstin E. Bett.

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Communicated by I. Rajcan.

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Elsadr, H.T., Wright, L.C., Peter Pauls, K. et al. Characterization of seed coat post harvest darkening in common bean (Phaseolus vulgaris L.). Theor Appl Genet 123, 1467–1472 (2011).

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  • Seed Coat
  • Common Bean
  • Segregation Ratio
  • Inheritance Study
  • Expect Segregation Ratio