Our results suggest two more possible mechanisms to tolerate sulfide
in the environment: 1.) constitutively low CytOx activities, as seen
in the estuarine species S. alterniflora, and 2.) an isozyme of CytOx
that is more tolerant of sulfide, as seen by higher Ki values in the
estuarine species S. patens and D. spicata and the flooding-tolerant
species P. australis, T. ramosissima, and P. arundinacea