Evaluation of wild red clover (Trifolium pratense L.) ecotypes and hybrid populations (Trifolium pratense L. x Trifolium diffusum Ehrh.) for clover rot resistance (Sclerotinia trifoliorum Erikss.)

Dabkeviciene, G.; Dabkevicus, Z.

Biologija 3: 54-58

2005


Accession: 004429160

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Abstract
Forage grass breeders are intensively searching for qualitatively novel initial breeding material, more attention is being paid to wild ecotypes' phenomenon of polymorphism within the species, and the application of interspecific hybridization is becoming increasingly widespread. The present study was designed to investigate the variability of clover rot resistance (Sclerotinia trifoliorum) in wild red clover (Trifolium pratense) ecotypes and hybrid populations (Trifolium pratense x Trifolium diffusum). Red clover ecotypes possessed a different resistance to the clover rot causal agent: 38.5% of the ecotypes were attributed to the moderately resistant clover group, whereas the plants of the standard cultivar Liepsna were non-resistant. Compared with non-resistant ecotypes, moderately resistant wild ecotypes exhibited a better overwinter survival and better digestibility characteristics, however, they accumulated lower contents of crude protein and green material. Interspecific hybrids, compared with the plants of the standard cultivars Liepsna and Vyliai, were characterized by increased (on average, 1.4 times higher) resistance to the causal agent of clover rot.