Characterization of Chlamydomonas reinhardtii Mutants That Exhibit Strong Positive Phototaxis.

ABSTRACT: The most motile phototrophic organisms exhibit photo-induced behavioral responses (photobehavior) to inhabit better light conditions for photosynthesis. The unicellular green alga Chlamydomonas reinhardtii is an excellent model organism to study photobehavior. Several years ago, we found that C. reinhardtii cells reverse their phototactic signs (i.e., positive and negative phototaxis) depending on the amount of reactive oxygen species (ROS) accumulated in the cell. However, its molecular mechanism is unclear. In this study, we isolated seven mutants showing positive phototaxis, even after the induction of negative phototaxis (ap1~7: always positive) to understand the ROS-dependent regulatory mechanism for the phototactic sign. We found no common feature in the mutants regarding their growt

SUBMITTER: Morishita J 

PROVIDER: S-EPMC8309459 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature