Journal Article

Phytochrome Regulation of Expression of mRNA Encoding the Major Light-Harvesting Chlorophyll <i>a/b</i>-Binding Proteins of Photosystem II in the Haploid Phase of <i>Adiantum capillus-veneris</i>

Steen Christensen, Yoko Tokuoka, Jane Silverthorne and Masamitsu Wada

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 39, issue 6, pages 647-654
Published in print June 1998 | ISSN: 0032-0781
Published online June 1998 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029417
Phytochrome Regulation of Expression of mRNA Encoding the Major Light-Harvesting Chlorophyll a/b-Binding Proteins of Photosystem II in the Haploid Phase of Adiantum capillus-veneris

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Light regulates development in the fern Adiantum capillus-veneris during both the haploid gametophyte and diploid sporophyte phases. In this study, we have investigated the role of the photoreceptor phytochrome in haploid spore germination and regulation of expression of mRNA encoding the major light-harvesting polypeptides of photosystem II {Lhcb mRNAs). Both of these responses appear to be induced by phytochrome and inhibited by blue light, acting.through separate photoreceptor(s). Characteristics of phytochrome action were similar for both responses, showing no induction in the very low fluence range and an ‘escape’ from far-red reversal for 50% of the response by 6 h. Overall, these results show that phytochrome regulates both a morphological and a molecular process in haploid fern spores, and that these processes may share a common signal transduction pathway.

Keywords: Adiantum capillus-veneris (Maidenhair fern); Gametophyte; Lhcb mRNA; Light regulation; Phyto-chrome; Spore germination

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Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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