Studies relating to seed set and germination in umbellifers
Proceedings of the National Institute of Sciences in India Part B Biological Sciences 34(1): 60-70
The maximum seed-set in Ammi majus, Anethum graveolens, Coriandrum sativum, Cuminum cyminum, Daucus carota, Foeniculum vulgare and Trachyspermum ammi is in the umbels of the first orders, and it declines in the umbels of higher order. The factors responsible for the low seed-set are male flowers, underdeveloped flowers and lack of pollination or fertilization. The seeds2 require a low temperature (15 to 25° C) for germination. The poor germination is mainly due to (a) abortion of seeds due to lack of pollination or fertilization, (b) attack of insects on the post-fertilized ovaries causing embryolessness and (c) seeds with rudimentary, dormant or defective embryos.