Anthocerotophyta (hornworts) belong to a group of ancient nonvascular plants and originate from a common ancestor with contemporary vascular plants. Hornworts represent a unique model for investigating mechanisms of formation of stress resistance in higher plants due to their high tolerance to the action of adverse environmental factors. In this work, we demonstrate that the thallus of Anthoceros natalensis exhibits high redox activity changing under stress.
Dehydration of the thallus is accompanied by the decrease in activities of intracellular
peroxidases,
DOPA-
peroxidases, and tyrosinases, while
catalase activity increases. Subsequent
rehydration results in the increase in
peroxidase and
catalase activities. Kinetic features of
peroxidases and tyrosinases were characterized as well as the
peroxidase isoenzyme composition of different fractions of the hornwort cell wall
proteins. It was shown that the hornwort
peroxidases are functionally similar to
peroxidases of higher vascular plants including their ability to form
superoxide anion-radical. The biochemical mechanism was elucidated, supporting the possible participation of
peroxidases in the formation of
reactive oxygen species (ROS) via substrate-substrate interactions in the hornwort thallus. It has been suggested that the ROS formation by
peroxidases is an evolutionarily ancient process that emerged as a protective mechanism for enhancing adaptive responses of higher land plants and their adaptation to changing environmental conditions and successful colonization of various ecological niches.