Abstract
SUMMARYA seasonal rhythm in blade elongation rate was observed in Alaria esculenta. Maximum (3.0–3.6 cm/week) and minimum (0.5–1.0 cm/week) rates were recorded in June and September, respectively. Translocation of growth‐promoting metabolites occurs within the main blade and between the sporophylls and blade. Bidirectional flow of growth‐promoting metabolities within the stipe was demonstrated. Seasonal effects of nutrients (NO3‐ and PO43‐) and photoperiod on blade elongation were shown in long‐term laboratory experiments. Control of seasonal blade growth by exogenous and endogenous factors is discussed.
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