Description
Using amphiploid and backcrossed derivatives of Italian ryegrass x tall fescue hybrids, the paper emphasizes the interest of introgression vs amphiploidization in breeding for specific traits such as persistency or seed production from tall fescue or ryegrass resp. Persistency in amphiploid and Lolium-introgressed progenies were assessed in nursery together with variation of flowering traits. Persistency was found lower, on average, in introgressed progenies than in hybrid progenies but with enlarged variability within progeny suggesting possible advantageous rearrangements of fescue chromosomes. Although significantly associated, persistency in both populations was only very little affected by the variations in flowering traits such as flowering date, number of heads in Spring and reheading in Summer. As these traits are related to seed productivity to some extent, it is suggested that selecting for both high persistency and high seed production potential should not be incompatible and could be successfully applied in tetraploid introgressive population resulting from one single backcross of hybrid into ryegrass.
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Persistency in Lolium x Festuca Hybrid Derivatives and its Relationships with Flowering Traits
Using amphiploid and backcrossed derivatives of Italian ryegrass x tall fescue hybrids, the paper emphasizes the interest of introgression vs amphiploidization in breeding for specific traits such as persistency or seed production from tall fescue or ryegrass resp. Persistency in amphiploid and Lolium-introgressed progenies were assessed in nursery together with variation of flowering traits. Persistency was found lower, on average, in introgressed progenies than in hybrid progenies but with enlarged variability within progeny suggesting possible advantageous rearrangements of fescue chromosomes. Although significantly associated, persistency in both populations was only very little affected by the variations in flowering traits such as flowering date, number of heads in Spring and reheading in Summer. As these traits are related to seed productivity to some extent, it is suggested that selecting for both high persistency and high seed production potential should not be incompatible and could be successfully applied in tetraploid introgressive population resulting from one single backcross of hybrid into ryegrass.
