Herbert B. Posner

Binghamton University

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Arie Rosner

Agricultural Research Organization

William S. Hillman

University of Manchester

Richard A. Gower

Binghamton University

Jonathan Gressel

Weizmann Institute of Science

James A. Markstein

SUNY Oneonta

Rita S. Posner

Binghamton University

Yosepha Shahak

Agricultural Research Organization

Allan Witztum

Ben-Gurion University of the Negev

Richard Malkin

University of Illinois Urbana-Champaign

A.H. Sparrow

Brookhaven National Laboratory

Cooperative Institutions

Binghamton University

Weizmann Institute of Science

Agricultural Research Organization

Cornell University

Brookhaven National Laboratory

State University of New York

Ben-Gurion University of the Negev

Washington State University

Klinik und Poliklinik für Strahlentherapie und Radioonkologie

GTx (United States)

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Elongation and spectrophotometrically assayable phytochrome of X-irradiated stem segments from etiolated Pisum sativum

Radiation Botany (1969)

Herbert B. Posner

Phytochrome

Far-red

Etiolation

Elongation

Phytochrome A

10.1016/s0033-7560(69)80012-8

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Effects of chloramphenicol on RNA synthesis in <italic>Spirodela</italic> chlorplasts

Plant and Cell Physiology (1975)

Herbert B. Posner Arie Rosner

RNA from chloroplasts isolated from Spirodela oligorrhiza included relatively rapidly-labeled fractions with apparent molecular weights of 2.7; 1.2; 0.7; and 0.5×106. With longer labeling, radioactivity appeared in the mature rRNAs (1.1 and 0.56×106 MW). Chloramphenicol inhibited the appearance of labeled mature rRNA, but increased the net labeling and caused the accumulation of the pulse-labeled RNAs, effects similar to those reported for bacteria.

10.1093/oxfordjournals.pcp.a075149

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Citations (15)

EFFECTS OF X IRRADIATION ON LEMNA PERPUSILLA

American Journal of Botany (1960)

Herbert B. Posner William S. Hillman

P osner , H erbert B., and W illiam S. H illman . (Yale U., New Haven, Conn.) Effects of x irradiation on Lemna perpusilla. Amer. Jour. Bot. 47(6): 506–511. Illus. 1960.—The effects of x rays on the multiplication rates (MR), percent flowering (Fl%) and gross morphology of aseptically grown cultures of Lemna perpusilla, strain 6746, were studied. MR values are unaffected by doses of less than 300 r but are progressively depressed as the dose increases. The effect of a given dose on short‐term MR values is the same at the 2 dosage intensities used, 500 and 2000 r/min. The inhibitory effect of intermediate doses on long‐term growth is delayed; high doses have an “immediate” effect. Bleaching of fronds and cessation of growth occur in all cultures given 5,000 r or higher. Radiosensitivity is not altered by addition of yeast extract and casein hydrolysate to the medium. Depressed Fl% and seed production appear to be consequences of lowered MR. Morphological aberrations such as small size, epinasty and wrinkling are temporary. Frond‐sequence may be altered by x rays but this aberration is permanent. Various aspects of the results are discussed.

Frond

Lemna

Radiosensitivity

Growth inhibition

10.1002/j.1537-2197.1960.tb10620.x

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Inhibitory Effect of Carbohydrate on Flowering in Lemna perpusilla

PLANT PHYSIOLOGY (1971)

Herbert B. Posner

A study was done on the effects of various factors on carbohydrate inhibition of flowering and on in vitro activity of glucose 6-phosphate dehydrogenase in Lemna perpusilla 6746 grown on dilute Hutner's medium in short days. Autoclaving decreased the flower inhibitory effect of sucrose but increased the effects of glucose and fructose. Sucrose inhibition was mimicked by CO(2) and was partially reversed by agitation of the cultures. Inhibition by sucrose was also partially reversed by ATP and intermediates of the tricarboxylic acid cycle, the glycolytic pathway, or the pentose phosphate pathway. Tartaric acid was inactive. Glycine, l-alanine, l-aspartate, l-asparagine, l-serine, l-glutamate, and l-glutamine were active, whereas l-cysteine, l-arginine, l-lysine, l-leucine, l-isoleucine, l-proline, l-tyrosine, l-tryptophane, and l-phenylalanine were not. Incubation of cultures on distilled water during a single inductive long night prevented flowering. This inhibition was partially reversed by l-alanine and glucose 6-phosphate. There was a correlation between carbohydrate inhibition of flowering and enhancement of glucose 6-phosphate dehydrogenase. Possible mechanisms for the carbohydrate inhibition of flowering are discussed.

Alanine

Lemna

10.1104/pp.48.3.361

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Citations (17)

Evidence for a Block between Plastoquinone and Cytochrome f in a Photosynthetic Mutant of Lemna with Abnormal Flowering Behavior

PLANT PHYSIOLOGY (1976)

Yosepha Shahak Herbert B. Posner Mordhay Avron

Mutant strain 1073 of Lemna perpusilla is concluded to be blocked between plastoquinone and cytochrome f in the photosynthetic electron transport system. The location of the block is based on the following observations of activities in chloroplasts isolated from the mutant and wild-type plants. (a) Relative to wild type, electron flow rates from water to ferricyanide, 2,6-dichlorophenol indophenol or NADP were very low in the mutant, but rates of photosystem I-dependent electron flow and cyclic phosphorylation were high. (b) Chlorophyll a fluorescence induction curves for mutant and wild type were similar. (c) Silicomolybdate and lipophilic acceptors in the mutant were photoreduced at rates comparable to wild type. (d) Cytochrome f of the mutant chloroplasts was not reduced by red light, but was oxidized by red or far red light. (e) Reduction of the primary electron acceptor of photosystem II (Q) by ATP-driven reverse electron flow was not observed in the mutant.

Plastoquinone

Cytochrome f

Cytochrome b6f complex

Wild type

Electron acceptor

10.1104/pp.57.4.577

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Citations (31)

Direct evidence for the lack of methylation of two pulse labeled plant RNAs

Plant and Cell Physiology (1974)

Herbert B. Posner Jonathan Gressel Arie Rosner

A product of the processing of precursor rRNA (“excess” RNA) has been indirectly found to be unmethylated in mammalian systems, but direct measurement was precluded because of its instability. The “excess” RNA of duckweeds is relatively stable allowing direct estimation of its methylation by polyacrylamide gel electrophoresis. The “excess” RNA with an apparent molecular weight 0.5×106 was unmethylated. A pulse labeled RNA with an apparent molecular weight of 1.2×106 (presumably from chloroplasts) was also unmethylated. Under similar conditions the presumed cytoplasmic rRNA precursors, and the mature cytoplasmic and chloroplast rRNAs were methylated.

RNA methylation

10.1093/oxfordjournals.pcp.a075069

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Citations (2)

Inhibitory Effect of Carbohydrate on Flowering in Lemna perpusilla. I. Interaction of Sucrose With Calcium and Phosphate Ions

PLANT PHYSIOLOGY (1969)

Herbert B. Posner

Flowering in Lemna perpusilla 6746 grown on tenth-strength Hutner's medium under short days was inhibited by 30 mM sucrose, glucose or fructose, but not by mannitol. The inhibition by sucrose does not appear to be due to sucrose-induced acidification of the medium during growth, or to trace metal contaminants of the sugar. Inhibition was partially prevented by raising either Ca(2+) or phosphate to levels used in half-strength medium. Possible mechanisms for these effects are discussed.

10.1104/pp.44.4.562

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Citations (12)

Lack of flowering responses to DGMU in a mutant of Lemna perpusilla 6746¹

Plant and Cell Physiology (1973)

Herbert B. Posner

10.1093/oxfordjournals.pcp.a074919

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Citations (3)

Teaching Introductory Cell & Molecular Biology: A Historical & Empirical Approach

The American Biology Teacher (1996)

Herbert B. Posner

Research Article| May 01 1996 Teaching Introductory Cell & Molecular Biology: A Historical & Empirical Approach Herbert B. Posner Herbert B. Posner Search for other works by this author on: This Site PubMed Google Scholar The American Biology Teacher (1996) 58 (5): 272–274. https://doi.org/10.2307/4450150 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation Herbert B. Posner; Teaching Introductory Cell & Molecular Biology: A Historical & Empirical Approach. The American Biology Teacher 1 May 1996; 58 (5): 272–274. doi: https://doi.org/10.2307/4450150 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentThe American Biology Teacher Search This content is only available via PDF. Copyright 1996 The National Association of Biology Teachers Article PDF first page preview Close Modal You do not currently have access to this content.

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10.2307/4450150

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Citations (2)

Reversal of sucrose inhibition of <italic>Lemna</italic> flowering by adenine derivatives<xref ref-type="fn" rid="fn1"><sup>1</sup></xref>

Plant and Cell Physiology (1973)

Herbert B. Posner

Journal Article Reversal of sucrose inhibition of Lemna flowering by adenine derivatives Get access Herbert B. Posner Herbert B. Posner Department of Biological Sciences, State University of New YorkBinghamton, New York, 13901, U.S.A. Search for other works by this author on: Oxford Academic Google Scholar Plant and Cell Physiology, Volume 14, Issue 6, December 1973, Pages 1199–1200, https://doi.org/10.1093/oxfordjournals.pcp.a074960 Published: 01 December 1973 Article history Received: 11 June 1973 Published: 01 December 1973

10.1093/oxfordjournals.pcp.a074960

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Citations (5)