Plant nutritional status modulates glutamine synthetase levels in ripe tomatoes (Solanum lycopersicum cv. Micro-Tom)

Journal of Plant Physiology
Telma E ScarpeciEstela M Valle

Abstract

Tomato (Solanum lycopersicum) fruit ripening implies that chloroplastic proteins are degraded and new proteins are synthesized. Supplementary nutrition is frequently required when tomato plants begin to fruit and continues until the end of the plant's life cycle. Ammonium assimilation is crucial in these fruit maturation and ripening processes. Glutamine synthetase (GS; EC 6.3.1.2), the main ammonium-fixing enzyme in plants, could not be detected in red fruits of several tomato varieties when growing under standard nutrition. In this paper, we analyze the influence of the nutritional status on the ammonium assimilation capacity of ripe tomato (cv. Micro-Tom) fruit. For this purpose, GS expression and protein profiles were followed in mature green and red fruits harvested from plants grown under standard or supplemented nutrition. Under standard nutrient regime (weekly supplied with 0.5 x Hoagland solution) GS activity was found in chloroplasts (GS2) of mature green fruits, but it was not detected either in the chromoplasts or in the cytosol of red fruits. When plants were shifted to a supplemented nutritional regime (daily supplied with 0.5 x Hoagland solution), GS was found in red fruits. Also, cytosolic transcripts (gs1) pref...Continue Reading

References

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Citations

Oct 31, 2009·Amino Acids·Augusto SorrequietaEstela M Valle
Feb 3, 2007·Molecular Nutrition & Food Research·Carmine GuarinoMauro Marra
Dec 14, 2011·Journal of the Science of Food and Agriculture·Martín D RéSilvana B Boggio
Jun 20, 2008·The Plant Journal : for Cell and Molecular Biology·Dana E MartínezJuan J Guiamet
May 13, 2019·Plant Cell Reports·Najiah M SadaliR Paul Jarvis
Aug 11, 2017·Journal of Agricultural and Food Chemistry·Sihua ChengZiyin Yang
Oct 11, 2021·The Plant Journal : for Cell and Molecular Biology·Raju MondalSanjib Kumar Chattopadhyay

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