Zooidal senescence in budding tunicates accompanies increasing activity of senescence-associated galactosidase and decreasing activities of zooid growth and budding. Nuclear Cu/Zn-superoxide dismutase (SOD1) and mitochondrial respiratory genes also attenuate during senescence. Knockdown of SOD1 by RNAi diminished the mitochondrial gene activity. The resultant zooids had defi ciencies in growth and budding without affecting galactosidase activity. See Kawamura and Sunanaga, 606–614.

No abstract is available for this article.