大村湾産アナアオサの不稔性変異種

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  • オオムラワンサン アナアオサ ノ フネンセイ ヘンイシュ
  • The Sterile Mutant of Ulva pertusa KJELLMAN from Omura Bay

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A green alga Ulva pertusa KJELLMAN is a very common species that grows on rocks in the lower intertidal zone along almost the entire coast of Japan. This plant is also able to grow as a floating algae. I found a large floating thallus of U. pertusa that measured about 1 m wide and 2 m long, in the spring of 1972 at Ōmura city in Ōmura Bay, Kyushu Japan. Fragments of this plant were cultured in 200 mℓ arm flask which contained PES medium and was aerated with compressed air. Throughout 10 years of repeated cultures of fragments, this plant never formed any swarmers, and continued only vegetative development. On the other hand, fragments of wild-type of U. pertusa easily formed swarmers within several days under the same culture condition. This plant from Ōmura Bay is thought to be a sterile mutant of U. pertusa. The thallus of the sterile mutant is yellowish green and thinner than the wild-type in thickness. According to cytological observations, the mutant is diploid with 18 chromosomes.

長崎大学水産学部研究報告, v.57, pp.33-37; 1985

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