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Production of phosphinothricin-tolerant rice (Oryza sativa L.) through the application of phosphinothricin as growth regulator (2000)

Toldi, O. ; Tóth, S. ; Oreifig, A. S. ; [et al.]

Springer

Plant cell reports 19 (2000), S. 1226-1231

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ISSN: 1432-203X

Keywords: Keywords Rice ; Herbicide resistance ; In vitro selection ; Phosphinothricin ; Glutamine synthetase ; Abbreviationsbar: Bialaphos resistance gene ; GA3: Gibberellic acid ; GM: Germination medium (Toldi et al. 1994) ; GS: Glutamin synthetase ; MS: Murashige and Skoog (1962) medium ; N6: Chu (1978) medium ; PAT: Phosphinothricin acetyltransferase ; PPT: l-Phosphinothricin ; R0 plants: In vitro regenerated plants originating from tissue culture ; R1 plants: Progeny of R0 plants

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract A novel procedure has been developed to produce rice (Oryza sativa L.) tolerant to the herbicide phosphinothricin (PPT) by means of in vitro selection. First, sublethal and lethal concentrations of PPT on 7-day-old seedlings were determined and morphogenetic events in response to the PPT treatment evaluated. Differentiation of 6–30 microshoots on 5–40% of the treated plant material was observed on a hormone-free culture medium supplemented with a sublethal concentration of PPT. We proved that PPT is morphogenetically active, similar to the action of many other herbicides, showing cytokinin-like effects in rice tissue culture. Fertile plants were grown from those microshoots having PPT tolerance under greenhouse conditions. To the best of our knowledge, this is the first report on the production of rice plants tolerant to this herbicide without genetic transformation. Since PPT is a competitive inhibitor of glutamine synthetase (GS), total GS activity in PPT-tolerant and PPT-sensitive plants was examined comprehensively in order to decide whether this enzyme has any role in PPT tolerance. An elevated GS activity was detected in PPT-tolerant plant material which could result in an elevated PPT tolerance at unchanged concentrations of the herbicide.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s002990000276

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Tagesrhythmische Veränderungen im Granulationsindex der juxtaglomerulären Zellen der Rattenniere (1973)

Krompecher-Kiss, É. ; Krompecher, T.

Springer

Cell & tissue research 137 (1973), S. 141-143

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ISSN: 1432-0878

Keywords: Juxtaglomerular cells ; Rat ; Granulation index ; Diurnal rhythm ; Statistical evaluation

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Description / Table of Contents: Zusammenfassung Das Granulations-Index der juxtaglomerulären epitheloiden Zellen der Rattenniere unterliegt tagesrhythmischen Schwankungen, wobei die berechneten Werte in den Nachtstunden significant höher sind als in den Tagesstunden.

Notes: Summary Marked diurnal changes occur in the granulation index of the juxtaglomerular cells in the rat kidney. According to the results the night values are significantly higher than those obtained in daytime.