1.A genetical analysis of male-sterility in carrots was made in one set of Fr's and in two sets of backcrosses. 2. The individual ratios were checked on binomial probability paper of MOSTELLER and TUKEY. In addition groups of ratios produced by crossing one male-sterile plant to various male-fertiles, or various male-steriles to one male fertile, were compared to backcross ratios as a further check. 3. Eight different hypotheses were tested. The hypothesis that male-sterility in carrots is controlled by a cytoplasmic factor, two duplicate nuclear genes (one recessive, one dominant), and two complimentary dominant fertility restoring nuclear genes, proved satisfactory.
CONTENTS
The factors affecting carotenoid formation in carrot roots are described in detail, and their significance for the evaluation of field trials and for the breeding of carrots of a good colour are discussed. (Abstract retrieved from CAB Abstracts by CABI’s permission)
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