Abstract
Common bean (Phaseolus vulgaris L.) is grown over a wide range of environments, including sites with low or high soil temperatures at sowing time. To describe the temperature responseof seed germination, 20 bean genotypes were evaluated using a rolled paper towel system with 11 constant temperatures ranging from 12 to 34 °C. Germination response was characterized by fitting cumulative counts using a maximum-likelihood analysis. Rate of germination increased from abase temperature (Tb) typically near 8 °C to an optimal development temperature (To) of 29 to 34 °C. Tb did not differ among common bean genotypes. Mesoamerican germplasm showed slightlyhigher To than Andean germplasm, but there was large variation in To within each of the two gene pools. The single accession of tepary bean (P. acutifolius) evaluated appeared to be the mosttolerant to high germination temperatures.
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