Aminoacid changes in leaves and roots of tomato (Solanum lycopersicum) during salt stress

作者：Debouba Mohamed^*; Suzuki Akira; Boutet Stephanie; Ghorbel Mohamed Habib; Gouia Houda

来源：Acta Botanica Gallica, 2010, 157(2): 255-264.

• tomato
• salt stress
• growth
• aminoacids

Tomato seedlings were exposed to 100 mM NaCl during 10 days NaCl stress led to about 40% and 20% decrease in leaf and root biomass, respectively Accumulation of Na(+) and Cl ions was concomitant with NH(4)(+) contents increase in stressed leaves and roots While total aminoacids contents rapidly increased by salt in both organs, they recovered control value in the leaves at the end of treatment In leaves, NaCl stress increased proline and senne contents, lately associated with accumulation of gamma-aminobutyric and asparagine Slat-treated roots showed 2-fold higher contents of senne, glycine, glutamine and GABA Asparagine became the most abundant aminoacid, accounting for 26% of total aminoacids in the treated roots These disturbances in the aminoacids composition reflect a new distribution of internal nitrogen compounds, building up an aminoacid pool with high N to C ratio and avoiding thus an ammoniacal intoxication. Proline, Asn and GABA are useful for nitrogen transport to developing tissues and protect against osmotic and oxidative stresses during salt stress

• 出版日期2010-6