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  • 1
    Electronic Resource
    Electronic Resource
    A role for glutamate decarboxylase during tomato ripening: the characterisation of a cDNA encoding a putative glutamate decarboxylase with a calmodulin-binding site (1995)
    Springer
    Plant molecular biology 27 (1995), S. 1143-1151 
    Details
    ISSN: 1573-5028
    Keywords: differential screening ; gene expression ; Lycopersicon esculentum ; rin ; ripening inhibitor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A tomato fruit cDNA library was differentially screened to identify mRNAs present at higher levels in fruit of the tomato ripening mutant rin (ripening inhibitor). Complete sequencing of a unique clone ERT D1 revealed an open reading frame with homology to several glutamate decarboxylases. The deduced polypeptide sequence has 80% overall amino acid sequence similarity to a Petunia hybrida glutamate decarboxylase (petGAD) which carries a calmodulin-binding site at its carboxyl terminus and ERT D1 appears to have a similar domain. ERT D1 mRNA levels peaked at the first visible sign of fruit colour change during normal tomato ripening and then declined, whereas in fruit of the ripening impaired mutant, rin, accumulation of this mRNA continued until at least 14 days after the onset of ripening. This mRNA was present at much lower levels in other tissues, such as leaves, roots and stem, and was not increased by wounding. Possible roles for GAD, and its product γ-aminobutyric acid (GABA) in fruit, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00020887
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Pollination-enhanced expression of a receptor-like protein kinase related gene in tobacco styles (1997)
    Springer
    Plant molecular biology 33 (1997), S. 653-665 
    Details
    ISSN: 1573-5028
    Keywords: cDNA ; pollination ; protein kinase ; receptor-like related ; style ; tobacco
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have isolated a putative serine/threonine receptor kinase gene with an expression pattern indicating that it may play a role in the stylar response to pollination. Differential display PCR was used to select tobacco mRNAs with increased accumulation following pollination. NTS16, a cDNA identified by this method, is homologous to a ca. 2.4 kb mRNA primarily expressed in pistil tissues. Levels of this mRNA increase during floral development and are further increased by pollination reaching maximal accumulation 12–18 hours after pollination and then declining. mRNA levels can also be increased by the application of ethylene to unpollinated flowers. A polypeptide encoded by the NTS16 open reading frame has sequence similarity to the catalytic domain of several receptor protein kinases from plants including the S-receptor kinases implicated in the rejection of self-pollen in Brassica species and the Pto gene product of tomato which confers resistance to a bacterial pathogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005787612041
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  • 3
    Electronic Resource
    Electronic Resource
    Expression of a proteasome α-type subunit gene during tobacco development and senescence (1999)
    Springer
    Plant molecular biology 39 (1999), S. 325-333 
    Details
    ISSN: 1573-5028
    Keywords: cDNA ; cell cycle ; expression ; mRNA ; protein degradation ; senescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Proteasomes degrade specific proteins that have been targeted for proteolysis by ubiquitination. In animals and yeast nuclear-localised proteasomes play a role in regulating the cell cycle, and other developmental processes, via control of the levels of regulatory nuclear proteins such as cyclins and transcription factors. A cDNA, NtPSA1, isolated from tobacco styles was found to have high similarity to human and yeast genes, PRCI−human and PRCI−yeast with 63.4% and 51.6% overall identity respectively. These genes are believed to encode non-catalytic α-type subunits of 26S proteasomes and like NtPSA1 have putative nuclear localisation signals. NtPSA1 RNA was found to accumulate to varying levels in different parts of the plant and at different developmental stages. In particular, the level of NtPSA1 RNA was high in young dividing and expanding tissues, and declined during the senescence of both leaves and flowers. These results suggest that a role of proteasomes in plant nuclei may be to regulate developmental events by controlling the levels of regulatory proteins in proliferating and developing tissues, rather than to degrade and recycle proteins during senescence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006102110889
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  • 4
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    The control of specificity in guard cell signal transduction (1998)
    The Royal Society
    Details
    Publication Date: 1998-09-29
    Description: Stomatal guard cells have proven to be an attractive system for dissecting the mechanisms of stimulus–response coupling in plants. In this review we focus on the intracellular signal transduction pathways by which extracellular signals bring about closure and opening of the stomatal pore. It is proposed that guard cell signal transduction pathways may be organized into functional arrays or signalling cassettes that contain elements common to a number of converging signalling pathways. The purpose of these signalling cassettes may be to funnel extracellular signals down onto the ion transporters that control the fluxes of ions that underlie stomatal movements. Evidence is emerging that specificity in guard cell signalling may be, in part, encoded in complex spatio–temporal patterns of increases in the concentration of cytosolic–free calcium ([Ca 2+ ] cyt ). It is suggested that oscillations in [Ca 2+ ] cyt may generate calcium signatures that encode information concerning the stimulus type and strength. New evidence is presented that suggests that these calcium signatures may integrate information when many stimuli are present.
    Print ISSN: 0962-8436
    Electronic ISSN: 1471-2970
    Topics: Biology
    Published by The Royal Society
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