Breeding Grasses and Protein Crops in the Era of Genomics by Gintaras Brazauskas Gražina Statkevičiūtė & Kristina Jonavičienė

Author:Gintaras Brazauskas, Gražina Statkevičiūtė & Kristina Jonavičienė
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Fig. 4.Number of selections as a maternal or paternal parent of polycross progeny plants (upper part) and general combining ability (GCA) for forage yields of their parental candidates (lower part) in group II.

Selected maternal parents (opened bars in Figs. 3 and 4) showed clearly that the breeders had selected maternal lines based on GCA for forage yields. Meanwhile, the indirectly selected paternal parents included inferior parents in GCA for forage yields (closed bars in Figs. 3 and 4). This result indicated that marker-based paternity tests can also be used to enhance selection gain by removing the progeny plants derived from inferior parents.

The reason for the unbalanced selection in group II might be IPS per se for the array of target traits, and/or unequal polycross mating described in Riday et al. (2013). Further studies must be conducted for interpretation of the occurrence of unbalanced selection in AWHS. Moreover, it is necessary to consider selection intensity in marker-based paternal selection and a sufficient number of plants before the selection for its establishment in timothy polycross breeding.

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