Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK S7N 5A8, Canada.
Theor Appl Genet. 2011 Dec;123(8):1467-72. doi: 10.1007/s00122-011-1683-8. Epub 2011 Aug 24.
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.
种子种皮收获后变暗（PHD）是几个干豆市场类别的生产者和消费者面临的一个问题。有三种 PHD 表型：（1）不变暗（ND），（2）缓慢变暗（SD）和（3）正常变暗（RD）。通过评估来自多个 RD、SD 和 ND 基因型杂交产生的群体，阐明了 PHD 的遗传。结果表明，至少有两个非连锁的主基因控制普通豆的 PHD 特性。具有三个表型类别的隐性上位性解释了来自 SD 和 ND 亲本杂交产生的群体的分离比例。一个基因 J 决定了豆种是否会变暗，因为 jj 植株的种子根本不会变暗。另一个基因 sd 影响种皮变暗的速度，sdsd 个体的变暗速度比具有显性 Sd 等位基因的个体慢。
