Genetic Control of Abnormal Seedling Development in Phaseolus vulgaris L. and P. vulgaris×P. acutifolius A. Gray Hybrids

M. E. Scott, T. E. Michaels

Research output: Contribution to journalArticlepeer-review

Abstract

Abnormal hybrid seedling development hinders attempts to introgress diverse germplasm in common bean (Phaseolus vulgaris L.) breeding programs. In this study, the hypothesis that DL1 and DL2 loci control abnormal seedling development both in Phaseolus vulgaris L. intraspecific hybrids and in P. vulgaris×P. acutifolius A. Gray interspecific hybrids was tested. Hybrids from crosses between six P. vulgaris lines (two Andean dl1 d1, DL2DL2, two Mesoamerican DL1DL1 dl2 dl2, and two facilitators dl1dl1, dl2dl2) and P. vulgaris cultivar Ex Rico 23 developed normally, indicating that Ex Rico 23 has the facilitator genotype dl1, dl1, dl2dl2. Previous studies have shown that Ex Rico 23 ×P. acutifolius results in abnormal seedlings, but ‘ICA Pijao’, also dl1, dl1 dl2dl2, ×P. acutifolius results in normal seedlings. Neither the Andean nor the Mesoamerican lines crossed successfully with P. acutifolius, but crosses between one of the two facilitators (G3807) and P. acutifolius resulted in normal seedlings. These results support the hypothesis that different loci control intra‐ and interspecific hybrid seedling development.

Original languageEnglish (US)
Pages (from-to)212-217
Number of pages6
JournalPlant Breeding
Volume104
Issue number3
DOIs
StatePublished - May 1990

Keywords

  • Phaseolus acutifolius
  • Phaseolus vulgaris
  • in vitro embryo culture
  • interspecific cross
  • introgrcssion
  • seedling development

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