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Interspecific hybrid embryos resulting from crosses between  Phaseolus  species generally fail to reach maturity, and embryo rescue techniques are required to recover plants. To determine if ovary (pod) culture could permit interspecific hybrid embryo development, pods of  P. vulgaris  L. ×  P. acutifolius  A. Gray and  P. vulgaris  L. (control) were cultured upright, supported by glasswool, in modified Murashige-Skoog liquid medium. The weight of seeds and length of embryos in  P. vulgaris  pods increased significantly during culture. However, usually only one or occasionally two seeds located at the middle positions of the pods developed to maturity. The same pod culture procedure promoted precocious germination of early cotyledonary-stage  P. vulgaris  ×  P. acutifolius  embryos without further maturation of the embryos. These findings confirm that developmental arrest of the interspecific hybrid embryos in vivo is due to intrinsic deficiencies.

Seed and Embryo Growth in Pod Cultures of Phaseolus vulgaris and P. vulgaris × P. acutifolius