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Physcomitrium patens (Hedw.) Mitt. growing in the dark defaults to an auxin- and cytokinin-independent developmental
Shawn R Robinson1, Ryan R McDonald1, Neil W Ashton1
1Biology, University of Regina, Regina, Saskatchewan, Canada.
Abstract:
Auxin and cytokinin partially restore Physcomitrium (formerly Physcomitrella ) patens gametophores that have developed in the dark to a form more typical of those grown in light. Auxin synthesis and/or transport in gametophores decrease with time spent in the dark. Auxin synthesis resumes in the apices of dark-grown gametophores upon their return to the light. Red light and to a lesser extent blue light are sufficient for this. The mas and GH3 promoters are both auxin-inducible but respond differentially to spatial cues.
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