Studies in bulk crosses between some beet strains

Authors

• Rolf Manner Linköping, Sweden

DOI: https://doi.org/10.23986/afsci.71526

Abstract

In the years 1952—56 the present author allowed different beet strains at the Gullåker Plant Breeding Institute to hybridize. In the years 1953—57 these hybrids were compared in trials with regard to their yield performance and some other practical features with the parents. Altogether 34 hybrids were compared in 138 comparisons with the parents. The progeny generations gave on an average smaller root and dry matter yields than the parents. The dry matter percentage was lower in the progeny generation than in the parental generation. The roots were not much more branched in the progeny generation than in the parental generation. The position of the roots in the soil and the form of the roots were not negatively influenced by crossing. Nor was the percentage of bolters larger than in the parental generation. The hybrids in which more than three strains were involved showed a tendency to give larger root yields than the strains in which only two strains were crossed. A corresponding increase in dry matter was not obtained. Considerable differences were found in the combining abilities between different types and strains and it seems to be possible to find combinations which have better yield performances than the parents. The consequence of crossing for the seed testing in field is discussed.