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Crossed Effects of Light and Temperature on the Growth and Maturation of Gametophytes in Costaria costata and Undaria pinnatifida
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 Title & Authors
Crossed Effects of Light and Temperature on the Growth and Maturation of Gametophytes in Costaria costata and Undaria pinnatifida
Na, Yeon Ju; Jeon, Da Vine; Han, Su Jin; Maranguy, Cyr Abel Ogandaga; An, Dae Sung; Cha, Hyung Kee; Lee, Jae Bong; Yang, Jae Hyeong; Lee, Hae Won; Choi, Han Gil;
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We examined for differences in the growth and fertility of microscopic stages between Costaria costata and Undaria pinnatifida in crossed temperature×irradiance (12, 17, 22℃×20, 60 μmol photons m–2s–1) and daylength×irradiance (8, 12, 16, 24 h×20, 60 μmol photons m–2s–1) experimental designs. After 13 days in culture, maximum gametophyte growths of the two species were obtained under the following combinations of factors: 17℃×60 μmol photons m–2s–1 and 24 h daylength×60 μmol photons m–2s–1. C. costata gametophytes produced sporophytes about 6 days earlier than those of U. pinnatifida. Sporophyte densities were highest in the 12 h daylength×60 μmol photons m–2s–1 combination after 20 days in C. costata (9.7 plants mm–2) and 26 days in U. pinnatifida (9.1 plants mm–2). However, optimal growth conditions for the microscopic sporophytes differed between species: 17℃×60 μmol photons m–2 s–1 for C. costata, 12℃×60 μmol photons m–2 s–1 for U. pinnatifida. Thus, C. costata gametophytes grew faster and produced sporophytes earlier than those of U. pinnatifida, even though the haploid gametophytes of the two species responded similarly to environmental conditions. Optimal growth temperatures for the microscopic sporophytes also differed between species.
Costaria costata;Fertility;Growth;Gametophyte;Undaria pinnatifida;
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