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Crop Science Abstract -

Allelic and Nonallelic Interactions of af, st, and tlw Genes in Pea1


This article in CS

  1. Vol. 27 No. 5, p. 852-856
    Received: May 19, 1986

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  1. T. Cardi,
  2. L. Frusciante and
  3. L. M. Monti2



Interaction effects between alleles at one locus with other loci and with environments influence degrees of dominance and F1 hybrid performance. To evaluate the effect of interactions among alleles, eight near-isogenic lines of pea (Pisum sativum L.) with the eight combinations of genes at the af, st, and tlw loci were self-fertilized and intercrossed in a half-diallel design. Plants were grown at Portici, Italy, in a randomized complete block design with three replications; results were compared with a similar experiment at Norwich, UK. The afgene was partially dominant for number of fertile nodes, number of pods and seeds, and yield per plant. The three genotypes ranked in order: AfAf > Afaf > afar for each of these traits. The st gene was partially dominant for stipule weight, but Stst heterozygotes exceeded both the homozygous StSt and stst genotypes in both yield and yield components. The recessive homozygotes were the least productive genotypes for all but one character. The tlw gene affected only leaf weight and number of basal branches, and showed overdominance for the latter trait. Since heterozygotes are morphologically very similar to dominant homozygotes, the mutant alleles studied can show pleiotropic effects also when the leaf phenotype does not vary or it varies slightly. Allelic interactions at one locus were influenced by the alle!ic state of the other two loci for number of fertile nodes and pods per plant, node of first flower, leaf weight, and number of pods at the first flowering node. The degree of dominance at the Af and St loci for plant yield varied with environment.

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Copyright © 1987. Crop Science Society of America, Inc.Copyright © 1987 by the Crop Science Society of America, Inc.