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Science 14 October 2005:
Vol. 310. no. 5746, p. 287
DOI: 10.1126/science.1116125
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Brevia

A Secondary Symbiosis in Progress?

Noriko Okamoto and Isao Inouye*

Algae have acquired plastids by developing an endosymbiotic relationship with either a cyanobacterium (primary endosymbiosis) or other eukaryotic algae (secondary endosymbiosis). We report a protist, which we tentatively refer to as Hatena, that hosts an endosymbiotic green algal partner but inherits it unevenly. The endosymbiosis causes drastic morphological changes to both the symbiont and the host cell architecture. This type of life cycle, in which endosymbiont integration has only partially converted the host from predator to autotroph, may represent an early stage of plastid acquisition through secondary symbiosis.

Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.

* To whom correspondence should be addressed. E-mail: iinouye{at}sakura.cc.tsukuba.ac.jp

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