Abstract
Transcellular ion currents are thought to play a role in the induction and maintenance of localized growth in plant cells. In the marine red algaGriffithsia pacifica, two types of cells elongate by localized tip growth, rhizoidal and repair shoot cells. The pattern of growth and morphogenesis in these cells can be altered by environmental and hormonal parameters. We examined the role of localized currents in four developmental processes inG. pacifica: 1. normal elongation of rhizoids, 2. the phototropic response of rhizoids, 3. the re-initiation of growth in dark-starved rhizoids, and 4. morphogenesis of repair shoot cells in the presence and absence of rhodomorphin, an endogenous hormone which regulates growth of these cells.
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