Abstract
Abstract Photosynthetic rates were measured on leaves of the upper canopy of 5 cultivars of dry bean (Phaseolus vulgaris L.) grown in replicated yield trials at 2 spacings in 1975, and at 1 spacing in 1976 to verify whether short-time photosynthetic rate measurements made in the field using a diffusion porometer technique were correlated with yield. A significant positive correlation, r = 0.58, was found between photosynthetic rate and biological yield at the close spacing (10 × 10 cm) in 1975. This relationship was not observed at the wide spacing (20 × 20 cm) in 1975 nor at the 30 × 5 cm spacing used in 1976. Furthermore, photosynthetic rates were not significantly correlated with seed yield, nor were they correlated with either seed yield per day or biological yield per day in either year or at any spacing. Thus, it is unlikely that photosynthetic rates measured at one period of crop growth on a small portion of the total canopy will be a useful selection criterion in breeding programs.
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