Connection between Abscisic acid- and Nitrate-induced Inhibition of Blue light-mediated Antheridiogenesis in the Fern Anemia phyllitidis L.Sw.

The effects of 2,4-dichlorophenoxyacetic acid (2,4-D), gibberellic acid (GA), and abscisic acid (ABA) on the morphogenesis of gametophytes of Lygodium japonicum growing as longer-than-broad biplanar plates in red light and as broader-than-long biplanar plates in blue light were studied. Addition of 2,4-D or GA to the medium induced a change in the form of gametophytes from biplanar to filamentous in red light. Gametophytes growing in a medium containing 2,4-D in blue light were longer than broad, very much like gametophytes growing in the basal medium in red light. Although ABA generally retarded the growth of gametophytes in both light regimes, its presence in a medium containing 2,4-D nullified the effect of the latter, causing gametophytes to become plate-like in red light and short and stunted in blue light. Changes in the morphology of gametophytes induced by growth hormones were accompanied by corresponding changes in their length:width ratio and cell number.

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The Multisensory Guard Cell. Stomatal Responses to Blue Light and Abscisic Acid

PLANT PHYSIOLOGY ◽

10.1104/pp.119.3.809 ◽

1999 ◽

Vol 119 (3) ◽

pp. 809-816 ◽

Cited By ~ 167

Author(s):

Sarah M. Assmann ◽

Ken-ichiro Shimazaki

Keyword(s):

Abscisic Acid ◽

Blue Light ◽

Guard Cell ◽

Stomatal Responses

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Photocontrol of Chloroplast Lipids in Fern Gametophytes

Zeitschrift für Naturforschung C ◽

10.1515/znc-1986-5-617 ◽

1986 ◽

Vol 41 (5-6) ◽

pp. 591-596 ◽

Cited By ~ 1

Author(s):

Stefan Kraiss ◽

Armin R. Gemmrich

Keyword(s):

Linoleic Acid ◽

Linolenic Acid ◽

Blue Light ◽

White Light ◽

Red Light ◽

Acid Synthesis ◽

Anemia Phyllitidis ◽

The Individual ◽

Hexadecatrienoic Acid ◽

Fern Gametophytes

In the gametophyte of the fern Anemia phyllitidis synthesis of linolenic acid esterified in monogalactosyldiglyceride requires light. By induction-reversion experim ents it could be demonstrated that this light-dependent step is mediated by phytochrome. There is also evidence for phytochrome control of galactolipid and hexadecatrienoic acid synthesis. In continuous blue light the synthesis of linolenic acid is inhibited and linoleic acid accumulates. It is concluded that the blue light photoreceptor affects an inhibition of linoleic acid desaturase. In continuous blue light chloroplasts contain abundant multilayered thylakoids, the grana regions are not as distinct as in white light, and membranes appear less appressed. In continuous red light the membranes are reduced in number and contain less grana-like appressions. It is concluded that both photoreceptors are necessary for a coordinate synthesis and assembly of the individual components of the chloroplast membrane.

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In vivo synthesis of [14C]Dilinoylgalactosylglycerol by gametophytes of the fern anemia phyllitidis

Zeitschrift für Naturforschung C ◽

10.1515/znc-1988-1-204 ◽

1988 ◽

Vol 43 (1-2) ◽

pp. 11-14

Author(s):

Eckard Klose ◽

Armin R. Gemmrich

Keyword(s):

Linolenic Acid ◽

Blue Light ◽

Anaerobic Conditions ◽

Aerobic Conditions ◽

Anemia Phyllitidis ◽

In Vivo Synthesis

Blue light-grown gametophytes of Anemia phyllitidis were used for the in vivo synthesis of radioactively labeled dilinoylgalactosylglycerol, a potential intermediate in the synthesis of linolenic acid. Optimal yield was obtained by incubating gametophytes with [14C]linoleate first for 2 h under anaerobic conditions followed by 46 h under aerobic conditions. As product [14C]dilinoylgalactosylglycerol was identified

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