Quantitative Photoperiodic Control of Erect Thallus Production in Sargassum muticum
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E. K. Hwang
Abstract
A photoperiodic response of erect thallus production has been quantified in Sargassum muticum. Young germlings were cultured under long-day (LD; 16:8 h) conditions at 16 °C, 75 μmol m−2 s−1 until they had 4–5 early blades after 60 days in culture. The young thalli were transferred to short-day (SD; 8:16 h) and night break (NB; 8:7.5:1:7.5 h) regimes. Up to 34.7% of the plants had produced erect thalli after 140 days in culture in the SD regime, but no erect thalli were formed in the NB regime. When plants were transferred from NB to SD regimes, erect thalli were initiated within 10 days, but continued to be produced in plants transferred from SD to NB. Therefore, the development of erect thalli in S. muticum is a genuine photoperiodic response, which is inhibited by NB treatments, but continues in a NB regime after sufficient induction in SD.
Copyright © 2002 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
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- Twenty Marine Benthic Algae New to South Africa, with Emphasis on the Flora of Kwazulu-Natal
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