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  • 1
    Electronic Resource
    Electronic Resource
    Amyloplast development in etiolated and ethylene-treated pea epicotyls (1988)
    Springer
    Planta 175 (1988), S. 425-431 
    Details
    ISSN: 1432-2048
    Keywords: Amyloplast sedimentation ; Apical hook ; Ethylene (gravitropism) ; Gravitropism ; Fisum (gravitropism)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The amyloplasts found in the apical hook cells of etiolated pea (Pisum sativum L.) epicotyls were randomly distributed. Sedimentation of endodermal amyloplasts in the direction of gravity became apparent in the transition from the hook to the top of the main axis of the epicotyl. Cortical amyloplasts in this region were not, however, sedimented. These patterns of sedimentation could not be related to changes in amyloplast size, and it is proposed that cytoplasmic properties determine amyloplast behaviour. The differentiation of plastids in the hook differed between the amyloplast-containing endodermal cells and the cortical cells, in which amoeboid plastids predominated over amyloplasts. Amyloplasts disappeared from the cortical cells in the main axis of the epicotyl, but in the endodermal cells sedimented amyloplasts were found throughout the upper epicotyl. Etiolated epicotyls induced to grow horizontally by treatment with ethylene had a normal content of amyloplasts, sedimented in the direction of gravity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396350
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  • 2
    Electronic Resource
    Electronic Resource
    Quantification of cytokinins by selected ion monitoring using 15N labelled internal standards (1980)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1980), S. 446-449 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A procedure has been developed for the synthesis of 6-chloropurine labelled with four 15N atoms. This compound can be used in the synthesis of a range of labelled cytokinin bases, which can be ribosylated by an enzymatic procedure. 15N labelled zeatin riboside was synthesized and used as an internal standard in the measurement by selected ion monitoring of the levels of this cytokinin in cultured crown gall and normal tissues of Vinca rosea, which were found to contain 402 and 2.5 ng per g fresh weight respectively.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200071008
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