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Some Aspects of the Biology of Scirpus maritimus
Thesis Abstract:
A study was made of some aspects of the growth pattern in Scirpus maritimus and the effects of some environmental factors.
It was observed that it took 3 to 5 days for a tuber to sprout a shoot. Three weeks after germination, two stolons with a young small tuber bearing a very young shoot were formed at the point of attachment of the shoot to the tuber. Four weeks after germination, the tuber bearing the young shoot gave rise to another tuber. All the shoots from such mother tuber in the first generation died 27 weeks after germination followed right afterwards by a second generation. None of the first-generation shoots produced flowers, and very few of the second-generations shoots flowered.
The only mode of propagation observed was tuber formation. Two kinds of tuber were noted, the nondormant and the dormant. Nondormant tubers increased from 3 weeks to their maximum number at about 15 weeks after germination, while dormant tubers were formed 10 weeks after germination and their maximum number was reached in about 23 weeks.
Dormant tubers broke their dormancy when separated from the chain. The highest tuber germination attained in petri dish was 96.66%. Bigger tubers gave higher germination percentage than the smaller ones.
Light had no effect on germination, and tubers could still germinate even when initially exposed to high temperature of 35°C. When kept in dry storage, however, germination decreased as the storage period was prolonged.