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  • Abscisic acid and protein synthesis  (1)
  • Abscisic acid and α-amylase formation  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Calcium-dependent induction of novel proteins by abscisic acid in wheat aleurone tissue of different developmental stages (1989)
    Springer
    Planta 179 (1989), S. 156-164 
    Details
    ISSN: 1432-2048
    Keywords: Abscisic acid and protein synthesis ; Aleurone ; Calcium and protein synthesis ; Protein synthesis ; Protein phosphorylation ; Seed development ; Triticum (ABA, Ca2+, protein synthesis)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Aleurone tissue of mature wheat (Triticum aestivum L. cv. Sappo) grains make novel polypeptides in response to abscisic acid (ABA), but only in the presence of Ca2+. Effects of ABA plus Ca2+ include up- and down-modulation of other polypeptides. The ABA-induced polypeptides appear not to be the 21-kilodalton (kDa) amylase inhibitor which has been reported to be ABA-inducible in barley. Aleurone tissue from developing grains of different ages failed to respond to ABA plus Ca2+ in any way. Endogenous ABA levels were determined by monoclonal radioimmunoassay in developing, mature, and “sensitised” developing tissues. The ABA level rose to a maximum at 35 days post anthesis but was not detectable in mature cells. Developing layers sensitised to gibberellic acid (GA) showed decreased levels of ABA, similar to those in mature tissue, concurrent with acquired responsiveness to GA in respect of its induction of α-amylase. However, these sensitised cells still remained non-responsive to added ABA in terms of modulation of polypeptide pattern, though they did respond to ABA in the blocking of GA-induced α-amylase production. The role of protein phosphorylation in signal transduction was examined. The implications of these findings are discussed with reference to the role of ABA in developing and mature aleurone cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393685
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  • 2
    Electronic Resource
    Electronic Resource
    Regulation of α-amylase formation and gene expression in the developing wheat embryo (1990)
    Springer
    Planta 181 (1990), S. 296-303 
    Details
    ISSN: 1432-2048
    Keywords: Abscisic acid and α-amylase formation ; α-Amylase production ; Gene expression ; Gibberellin and α-amylase formation ; Osmotic control (α-amylase) ; Triticum (embryo development)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Embryos in developing wheat (Triticum aestivum L., cv. Sappo) grains (15–40 d post anthesis, dpa) contain no detectable α-amylase. When isolated from the grain they produce the enzyme even though they do not germinate. Younger (15 dpa) and older (45 dpa) embryos produce only a group of isozymes of low isoelectric point (pI): at intermediate ages low-pI and high-pI groups appear. The low-pI group is formed first, about 6 h after isolation, followed by the high-pI group at 16h. The formation of high-pI isoenzymes is prevented by abscisic acid and osmoticum, which also suppress the accumulation of high-pI mRNA. Almost all of the low-pI isoenzymes are unaffected by these two factors. Low-pI mRNA transcripts are present in embryos in situ but are not translated. Translation occurs when embryos are isolated, though there appears to be no further accumulation of low-pI mRNA. Addition of gibberellic acid to isolated embryos causes a great increase in accumulated high-pI mRNA, but only a small increase in low-pI message. Added gibberellic acid enables younger and older embryos to produce high-pI isoenzymes. The regulation of α-amylase gene expression and enzyme formation in developing embryos in situ is discussed in the light of these findings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00195879
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    Paper (German National Licenses)
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