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Hormonal regulation of S-adenosylmethionine synthase transcripts in pea ovaries

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Abstract

Two cDNA clones coding for S-adenosyl-L-methionine synthase (SAMs, EC 2.5.1.6) have been isolated from a cDNA library of gibberellic acid-treated unpollinated pea ovaries. Both cDNAs were sequenced showing a high degree of identity but coding for different SAMs polypeptides. The presence of two SAMs genes in pea was further confirmed by Southern analysis. Expression of the SAMs genes in the pea plant was found at different levels in vegetative and reproductive tissues. We characterized the expression levels of SAMs genes during the development or senescence of pea ovaries. Northern analysis showed that transcription of SAMs genes in parthenocarpic fruits was upregulated by auxins in the same manner as in fruits from pollinated ovaries. In both pollinated and 2,4-dichlorophenoxyacetic acid-treated ovaries, an induction of SAMs mRNA levels was detected at the onset of fruit development. Gibberellic acid and benzyladenine, although able to induce parthenocarpic development, did not affect SAMs mRNA levels. These data are consistent with an active participation of auxins in the upregulation of SAMs during fruit setting in pea and suggest that, at the molecular level, parthenocarpic development of pea ovaries is different for gibberellin- and cytokinin-treated ovaries than for auxin-induced parthenocarpic fruits. In senescing ovaries, SAMs mRNA levels also increased, probably associated with ethylene biosynthesis since treatment of the ovaries with aminoethoxyvinylglycine resulted in a delay of senescence and prevention of SAMs mRNA accumulation. A possible mechanism for hormonal regulation of SAMs during ovary development is discussed.

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  1. Departament de Bioquímica i Biologia Molecular, Universitat de València, Dr. Moliner 50, Burjassot, E-46100, València, Spain

    Lourdes Gómez-Gómez & Pedro Carrasco

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  1. Lourdes Gómez-Gómez
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  2. Pedro Carrasco
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Gómez-Gómez, L., Carrasco, P. Hormonal regulation of S-adenosylmethionine synthase transcripts in pea ovaries. Plant Mol Biol 30, 821–832 (1996). https://doi.org/10.1007/BF00019014

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  • DOI: https://doi.org/10.1007/BF00019014

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