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Moritella profunda sp. nov. and Moritella abyssi sp. nov., two psychropiezophilic organisms isolated from deep Atlantic sediments

¹ J. M. Wiame Research Institute for Microbiology, Free University of Brussels (VUB), and Flanders Inter-University Institute for Biotechnology, 1, ave E. Gryson, B-1070 Brussels, Belgium
² The DEEP STAR Group, Japan Marine Science and Technology Center, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
³ Alfred Wegener Institut für Polar-und Meeresforschung, Am Handelshafen 12, D-27570 Bremerhaven, Germany

Correspondence
Ying Xu
xuying{at}vub.ac.be

Strains 2674^T (=LMG 21259^T =JCM 11435^T) and 2693^T (=LMG 21258^T =JCM 11436^T) were isolated from Atlantic sediments at a temperature of 2 °C and a depth of 2815 m off the West African coast. Polyphasic evidence indicates that the two strains belong to the genus Moritella and represent distinct species, for which the names Moritella profunda sp. nov. (for strain 2674^T) and Moritella abyssi sp. nov. (for strain 2693^T) are proposed. The moderate piezophily of the two organisms is intermediate between that of the type species, Moritella marina, which is not piezophilic, and Moritella yayanosii, an obligate piezophile. Both are strict psychrophiles with slightly different cardinal temperatures: at 0·1 MPa, maximal growth rates are observed at 2 °C (M. profunda) and 4 °C (M. abyssi) with maximum temperatures of 12 °C (M. profunda) or 14 °C (M. abyssi). The optimal pressure is lower than that at the site of isolation, and raising the temperature to 10 °C makes the organisms more piezophilic.

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