Effects of irradiance and temperature on the germling growth of Sargassum macrocarpum (Phaeophyta) from Ohno-Seto strait, Hiroshima bay [Japan]
1997
Yoshida, G. (Nansei National Fisheries Research Inst., Ono, Hiroshima (Japan)) | Arai, S. | Terawaki, T.
The effects of irradiance and temperature on germling growth of Sargassum macrocarpum sampled from Ohno-Seto Strait, Hiroshima Bay were studied under laboratory conditions. Increase of the total thallus-area (primary leaves and stipes) and attachment-area (rhizoid and holdfast) were used as indexes of growth. The increase of the total thallus-area saturated at an irradiance of 50 mu Em(-2)s(-1) in the range of 12.5-400 mu Em(-2)s(-1) at 20 degrees C. On the other hand, the attachment-area increased up to 200 mu Em(-2)s(-1). Under a constant illumination of 100 mu Em(-2)s(-1), the most rapid increase of the total thallus-area was shown at 25 and 30 degrees C through the culture period, and attachment-area achieved its highest increase at 20 or 25 degrees C during the initial 2 weeks of culture, but at 15 degrees C for the succeeding 2 weeks. The ratios of thallus-area to attachment-area were so variable between culture conditions and durations. This results indicate that the allocation of assimilatory products for the organ development of young plants is changeable in accordance with environmental conditions and the developmental stages
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