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On the nature of hybrid dwarfness
- Akhmedov, M. A.
- Russian journal of genetics 2010 v.46 no.8 pp. 1016-1018
- Triticum aestivum, Triticum turgidum subsp. dicoccon, crossing, dwarfing, genes, hybrids, pleiotropy, progeny
- In studies of the hybrid combination ((F₄ Khar'kovskaya 46 × Triticum dicoccum) × Khar'kovskaya 46), a short-stemmed line, whose progeny exhibited traits of hybrid dwarfism, segregated with a frequency close to 1: 15. Analysis of this line in F₃ and hybrids from crosses of the short-stemmed line from this combination with the long-stemmed accession T. turgidum L. (c-38097) showed that the stem size variability curves of the both lines have two peaks. Since these results cannot be explained by complementary interaction of D genes, hybrid dwarfism is probably controlled by pleiotropic action of two genes that have multiple pleiotropic effect on the D ₂ D ₂ D ₃ D ₃ genes. Two or three rounds of selection performed on the progeny of plants higher than 80-100 cm produces stable lines without hybrid dwarfism traits, i.e., the pleiotropic effect disappears.