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166<br />

7. ROLE OF QTLs IN THE EARLY EVOLUTION...<br />

There was no clear connection between the level of heterosis and genetic diversity of<br />

parents based on RAPD, ISJ and enzymatic data. When interspecific cross combinations<br />

were compared, it was more or less obvious that heterosis was typical of crosses between<br />

more diverse parents. Genetic similarity between BR3 and NZ15 was quite low and reached<br />

0.588 and these parents produced the heterotic hybrid for seven characters. On opposite,<br />

genetic similarity between HU5 and BO2 was 0.754 and no heterosis was observed in F 1<br />

.<br />

Unfortunately, this rule was not true for intraspecific crosses. Parents of both L. multiflorum<br />

and L. perenne hybrids were the most similar with I value equal to 0.870 and 0.842, respectively,<br />

yet heterosis was observed quite frequently (25% of traits). Even more surprising was<br />

extremely high green and dry weight of tillers in the L. perenne hybrid that could not be predicted<br />

based on rather poor performance of the parents.

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