STUDIES IN DACTYLIS

I. FERTILITY RELATIONSHIPS IN SOME DIPLOID SUBSPECIES

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Summary

Hybridizations were carried out between samples of ten diploid Dactylis subspecies. Both pollen fertility and ‘fertility index’ of hybrids decreased from initial cross to F2. There was no correlation of fertility with geographical distribution of the parents, and despite the fall in hybrid fertility it was considered that gene exchange would not be completely prevented.

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