Seed germination and seedling growth of Citrullus lanatus (Thunb.) Mansf. in relation to certain growth regulators
AbstractThe effect of cycocel, gibberellic acid and kinetin was investigated on the seed germination and seedling growth of C. lanatus. Cycocel favoured germination in total darkness and largely inhibited it in diffuse light. The growth of radicule and hypocotyl was promoted only in total darkness. Gibberellic acid accelerated the pace of germination in total darkness more than diffuse light in the firs 24 hours. The growth of the radicule as well as the hypocotyl was more in diffuse light, whereas only the radicule indicated an enhanced growth in total darkness in low concentration. The known influence of this chemical on the shoot elongation largely remained ineffective. In kinetin cent percent germination was obtained in total darkness which was not so in diffuse light , except for high concentration. It enhanced the pace of germination in total darkness in the first 24 hors. The seedling growth was promoted in diffuse light, while it was inhibited in total darkness. The increase in the size of the cotyledons took place only in diffuse light. It became apparent that kinetin and gibberellic acid could partly substitute the requirements of total darkness for seed germination in this species.
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