作者
Koichi Hori,Fumito Maruyama,Takatomo Fujisawa,Tomoaki Togashi,Nozomi Yamamoto,Mitsunori Seo,Shusei Sato,Takuji Yamada,Hiroshi Mori,Naoyuki Tajima,Takashi Moriyama,Masahiko Ikeuchi,Mai Watanabe,Hajime Wada,Koichi Kobayashi,Masakazu Saito,Tatsuru Masuda,Yuko Sasaki‐Sekimoto,Kiyoshi Mashiguchi,Koichiro Awai,Mie Shimojima,Shinji Masuda,Masako Iwai,Takashi Nobusawa,Takafumi Narise,Satoshi Kondo,Hikaru Saito,Ryoichi Sato,Masato Murakawa,Yuta Ihara,Yui Oshima-Yamada,Kinuka Ohtaka,Masanori Satoh,Kohei Sonobe,Midori Ishii,Ryosuke Ohtani,Miyu Kanamori-Sato,Rina Honoki,Daichi Miyazaki,Hitoshi Mochizuki,Jumpei Umetsu,Koichi Higashi,Daisuke Shibata,Yuji Kamiya,Naoki Sato,Yasukazu Nakamura,Satoshi Tabata,Shigeru Ida,Ken Kurokawa,Hiroyuki Ohta
摘要
The colonization of land by plants was a key event in the evolution of life. Here we report the draft genome sequence of the filamentous terrestrial alga Klebsormidium flaccidum (Division Charophyta, Order Klebsormidiales) to elucidate the early transition step from aquatic algae to land plants. Comparison of the genome sequence with that of other algae and land plants demonstrate that K. flaccidum acquired many genes specific to land plants. We demonstrate that K. flaccidum indeed produces several plant hormones and homologues of some of the signalling intermediates required for hormone actions in higher plants. The K. flaccidum genome also encodes a primitive system to protect against the harmful effects of high-intensity light. The presence of these plant-related systems in K. flaccidum suggests that, during evolution, this alga acquired the fundamental machinery required for adaptation to terrestrial environments. Plant colonization of land is an important evolutionary event. Here, the authors sequence the genome of a filamentous terrestrial alga and, through a comparative analysis with related algae and land plant species, provide insight into how aquatic algae adapted to terrestrial environments.