Flower-Inducing Activity of Phloem Exudate in Cultured Apices fromPharbitisSeedlings

摘要

Phloem exudate from cotyledons of photoperiodically inducedPharbitisplants induced flowering in apices excised from non-induced seedlings and cultured in vitro. The exudate also stimulated flowering in apices excised from photo-induced seedlings and cultured under long-day conditions. The application of benzoic acid had similar effects. Both the exudate from non-induced plants and gallic acid suppressed flowering in apices from photo-induced seedlings. It appears that the phloem exudate contains flower-inducing or flower-suppressing substance(s), depending on the plant materials from which it was collected.