寒冷地におけるシネンシス系デルフィニウムの開花習性(発育制御)  [in Japanese] Flowering Habit of Delphinium grandiflorum L. in the Cool Northern Areas of Japan(Growth Regulation)  [in Japanese]

寒冷地におけるシネンシス系デルフィニウムの開花習性を明らかにするため,抽苔発現と花芽形成過程との関連性を調査した.5月下旬に播種した場合,抽苔開始2週間前の8月上旬から花芽分化を開始し,抽苔開始3週間後に開花した.播種時期を変えて抽苔までの所要日数を調査した結果,抽苔日数は7〜9月播種で顕著に増加した.3〜6月播種では早期抽苔を生じ,平均抽苔日数は減少した.7月と8月播種では抽苔日数が異なる二つの集団が観察された.抽苔日数と到花日数との間には,統計学的に有意な正の相関が認められた.

To clarify the flowering habit of Delphinium grandiflorum L. in the cool northern areas of Japan, the relationship between the developmental stage of flower bud and the expression of bolting was examined. Plants were sown in late May and began to form flower buds two weeks prior to bolting at the beginning of August. They flowered three weeks after the start of bolting. When plants were sown between July and September, the days to bolting increased markedly. However, in plants sown between the end of March and June, early bolting occurred and the days to bolting decreased. Among plants sown between July and August, two groups were observed with different numbers of days to bolting. Positive correlation was observed between the days to bolting and the days to flowering.