Dormancy in Winter Buds of American Pondweed,Potamogeton nodosusPoir

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Abstract
Winter buds of American pondweed (Potamogeton nodosus Poir.) were found to be strongly dormant at maturity. Under normal conditions the dormancy lasted for several months. Cold treatment decreased the period required for after-ripening, and exposure of dormant buds to 32° C for three days caused most of the buds to grow in two weeks. Removal of bud scales in light was very effective in promoting growth. Soaking of dormant buds in solutions of gibberellic acid, sucrose, combinations of gibberellic acid and sucrose, α-naphthylacetic acid and fenac (2,3,6-trichlorophenylacetic acid) partially relieved the growth suppression. Treatments with indole-3-acetic acid at 1,000 ppm for 18 hours broke dormancy completely in all buds, indicating that low levels of this substance may be the primary cause of dormancy in this species.