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Evaluation of the Genetics of Relative Phosphorus Accumulation by Corn (Zea mays L.) Using Chromosomal Translocations¹

Reciprocal chromosomal translocations were selected as the genetic tool for an investigation of the genetic control of relative P accumulation by leaves of corn (Zea mays L.). Each of 10 translocation sto~ks was crossed to inbreds Pa 83 and Pa 94, which had been selected as low and high P accumulators, respectively. The translocation stocks were selected so that each corn chromosome would be involved in the translocations of two different stocks. Backcrosses to the inbred parent resulted in 20 progeny sets wherein tests for linkage to interchange points could be made.

Within each backcross progeny set, many of the "semisterile" progeny should be of the F₁ genotype at those loci linked to an interchange point; the closer the linkage, the greater the proportion of progeny reflecting the F₁ genotype would be. Alternatively, a high proportion of the "normally fertile" progeny should reflect the inbred genotype at these locl. A significant difference between P accumulation, measured as the mean P concentration of the ear leaf blades of progeny in each class, was considered indicative of segregation of at least one genetic locus that influences relative P accumulation. From the results, a minimum of six genetic loci that affect relative P accumulation was postulated. Although the potential effect of each locus could not be evaluated from the data obtained, the total observed segregation accounted for most of the P accumulation difference between inbreds ‘Pa 83’ and ‘Pa 94.’

Key Words: Chemical element accumulation

² Formerly Graduate Assistant (now Assistant Professor, University of Tennessee) and Professor of Agronomy, respectively.

Received for publication January 24, 1968.