ARBUSCULAR MYCORRHIZAL FUNGI MITIGATES NaCl INDUCED ADVERSE EFFECTS ON SOLANUM LYCOPERSICUM L.
ABEER, HASHEM . 2015
The present study aimed to investigate the effects of AMF on the growth and physio-biochemical attributes, antioxidant
enzyme activities, plant growth regulators and inorganic nutrients in tomato grown under salt stress condition. Tomato
plants were exposed to different concentrations of NaCl alone (0, 50 and 150 mM) and in combination with AMF
(0mM+AMF, 50mM+AMF and 150mM+AMF). Spore population and colonization, growth and biomass yield, pigments,
membrane stability index and malondialdehyde were negatively affected. Exposure of plants to combination of NaCl and
AMF showed positive impact on the above parameters. Proline and antioxidant enzyme activity increased with increasing
concentration of NaCl and further increase was observed in plants treated with NaCl in combination with AMF. Acid and
alkaline phosphatase, hydrolytic enzymes and pectinase are also affected with increasing concentration of salt. However
plants treated with NaCl in combination with AMF balances the above enzymatic activity. Salt stress decreases the auxin
concentration in plants but application of AMF has been shown to restore the auxin content. ABA increases with salt
concentration but less accumulation of ABA have been found in plants treated with AMF. Regarding the nutrient uptake,
Na+ and Na;K ratio increased and P, K, Mg and Ca decreases with increasing concentration of NaCl. Enhanced
accumulation of P, K, Mg, Ca and K:N ratio and less uptake of Na+ was observed in presence of AMF. The results confirm
that NaCl imposes threat to the survival of tomato plants and application of AMF mitigates the negative effect to an
appreciable level.
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