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Relative efficiency of two mating systems and selection procedures for yield improvement in wheat (Triticum aestivum L.)

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Summary

The relative efficiences of the biparental mating systems and selfing series in connection with phenotypic and geno-phenotypic selection procedures were evaluated for yield improvement in a cross ‘HP1102’ X ‘CPAN 1681’ of wheat. Two selection cycles having a 4 per cent selection intensity for grain yield were carried out following both selection procedures under the two mating systems. Following these selection procedures, a greater improvement for grain yield could be achieved with the biparental mating system than with the selfing series. During the first selection cycle, the geno-phenotypic selection procedure had an edge over phenotypic selection procedure. The realized response due to the second cycle of selection and the predicted response for the third selection cycle indicated that the phenotypic selection procedure is more efficient than the geno-phenotypic selection procedure. It is suggested that selection following intermating in early segregating generations is able to overcome several inherent limitations of the simple pedigree method as it is possible to increase genetic variation and to concentrate favourable genes and gene combinations for grain yield. An increase in grain yield was, in general, accompanied by an increase in plant height, peduncle length, 100 grain weight, tiller number and biological yield. Therefore, it is suggested that an index comprised of grain yield, plant height, tiller number, grain weight and biological yield could be used for selecting high yielding genotypes of suitable height.

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Communicated by G. S. Khush

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Balyan, H.S., Verma, A.K. Relative efficiency of two mating systems and selection procedures for yield improvement in wheat (Triticum aestivum L.). Theoret. Appl. Genetics 71, 111–118 (1985). https://doi.org/10.1007/BF00278261

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Key words

  • Mating systems
  • Selection procedures
  • Selection efficiency
  • Correlated response
  • Triticum aestivum L.