GERMINATION-REGULATING MECHANISMS IN SOME DESERT SEEDS VIII. ARTEMISIA MONOSPERMA

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Germination of achenes of Artemisia monosperma is absolutely dependent on light, irrespective of temperature. Full saturation by light was obtained with 24 meter-candle seconds and more than half with 0.1 meter-candle second. Nevertheless, even with saturating irradiation, action of light was cumulative, requiring repeated short irradiation, the number depending on temperature, separated by a minimal interval. Responsiveness to light increased with progress of incubation. The cumulativeness and the increase in responsiveness are discussed. A gradual achievement of an equilibrium between an inactive precursor and a substance which participates in the light-induced reactions, is postulated. The stage of equilibrium, as well as the rate at which it is reached are temperature-dependent. Light-independent reactions which are triggered by irradiation may be reversed by incubation at supra-optimal temperatures, or by desiccation, and full promotion may be restored after re-imbibition or after return to optimal temperatures, by an additional irradiation. The ecological significance of the germination response is also discussed.
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