Abstract
The seed fertility of triplold mulbelry tlees derived from two ways was investigated. One group of triploids (A) was originated by crossing of artificialfy diploidized garnete cell (Ken-mochi, a diploid race) and normal pollen grain. (Kairyo-nezumigaeshi, a dip loid race) and the othel, (B) was originated by crossing of the autotetraploid of Kenmochi (4x) and Kairyo-nezumigaeshi (2x) Fertilities obtained under natural and artlflclal crosses varied between group (A) and (B), accord-ing to their different origins. Hign seed production and seed germination were observed in group (A) rather than group (B).
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