On Differential Mortality with Respect to Seed Weight Occurring in Field Cultures of Pisum sativum

J. Arthur Harris
1914 American Naturalist  
IN two papers which have already appeared in these pages,' I have shown that for the dwarf varieties of Phaseolus vulgaris the mortality of apparently perfect seeds (failure to germinate or to complete the life cycle) is not random, but differential, or selective. It seemed highly desirable to extend these studies to other forms. Pisum sativum)n naturally occurred to me as affording suitable experimental material-both because of the wide range of seed characteristics and the convenience with
more » ... convenience with which it maybe bred. I had no pedigreed seed and consequently began work in the spring of 1913 with commercial stock. About 1,000 seeds from each of ten early (dwarf) varieties purchased from the Thorburn seed company were weighed, individually labelled and planted in short rows scattered over one of the fields of the Station for Experimental Evolution. Conditions were not the best, and the mortality was high. Table 12 gives the weights in units of .025 gram range3 1 Harris, J. Arthur, ' On Differential Mortality with Respect to Seed Weight Occurring in Field Cultures of Phaseolus vulgaris," AMER. NAT., 46: 512-525, 1912; " Supplementary Studies on the Differential Mortality
doi:10.1086/279392 fatcat:y7uu3vil3nfzzhztsoou4op62y