Evidence for cytokinins in gametophytes of the fern Anemia phyllitidis L. Sw.

Schraudolf, H.; Fischer, Ansgar

doi:10.1016/0304-4211(79)90060-9

Cited by 7 publications

(3 citation statements)

References 16 publications

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“…While the effects of cytokinins in bryophyte development have been well studied, little is known about the role of cytokinins in pteridophytes. Cytokinins have been identified in fern gametophytic (Schraudolf and Fischer 1979) and sporophytic (Yamane et al 1983) stages, but have only a slight effect on developmental patterning in light-grown ferns, attributed to an increase in mitosis (reviewed by Raghavan 1989). In this study we investigated the role of cytokinins in the development of dark-grown gametophytes of the tropical fern Ceratopteris richardii.…”

Section: Introductionmentioning

confidence: 96%

Cytokinins Induce Photomorphogenic Development in Dark-grown Gametophytes of Ceratopteris richardii

Spiro

Torabi

Cornell

2004

Plant and Cell Physiology

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The cytokinins benzylaminopurine, kinetin and isopentenyladenine induce photomorphogenesis in dark-grown gametophytes of the fern Ceratopteris richardii. At sub-nanomolar concentrations each altered the rate and pattern of cell division, elongation and differentiation, mimicking aspects of the light-mediated transition from filamentous to prothallial growth. Untreated dark-grown gametophytes grow as narrow, elongate, asexual filaments with an apical meristem. Cytokinin treatments as low as 10(-12) M reduced the length-to-width ratio through decreased cell elongation, increased periclinal cell division and induced the formation of rhizoid initials in the cells immediately below the apical meristem. Higher concentrations (10(-9)-10(-8) M) induced conversion of the meristem from apical to notch morphology. Cytokinins induced both red- and blue-light-mediated photomorphogenic events, suggesting stimulation of both phytochrome and cryptochrome signaling; however, cytokinin treatment only partially substituted for light in that it did not induce hermaphroditic sexual development or spore germination in the dark. Additionally, cytokinins did not increase chlorophyll synthesis in dark-grown gametophytes, which unlike angiosperms are able to produce mature chloroplasts in the dark. Cytokinin treatment had only slight effects on light-grown gametophytes. These results suggest evolutionary conservation between angiosperms and pteridophytes in the role of cytokinins in regulating photomorphogenesis.

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Section: Introductionmentioning

confidence: 96%

Cytokinins Induce Photomorphogenic Development in Dark-grown Gametophytes of Ceratopteris richardii

Spiro

Torabi

Cornell

2004

Plant and Cell Physiology

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“…The interaction of hormones may be involved. Abscisic acid (Cheng and Schraudolf, 1974), auxin in the form of lAA (Hotta, 1959), ethylene (Miller et al, 1970), GA^ (Schraudolf, 1966c), and ribosylated zeatin (Schraudolf and Fischer, 1979), along with antheridiogens, all have been isolated from fern gametophytes. Very little is known about their sites of synthesis or their modes of translocation.…”

Section: Location Of Antheridlum Initialsmentioning

confidence: 99%

“…phvllitidis (Burcky, 1977;Cheng and Schraudolf, 1974) and recently, ABA was shown to inhibit antheridium formation in Ceratopteris (Hickok, 1983). All of the other major plant hormone groups are represented in fern gametophytes (Hotta, 1959;Miller et al, 1970;Schraudolf, 1966c;Schraudolf and Fischer, 1979), some perhaps also inhibitory.…”

Section: Location Of Antheridiamentioning

confidence: 99%