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Journal of Experimental Botany, Vol. 52, No. 364, pp. 2241-2242, November 1, 2001
© 2001 Oxford University Press

Gene Notes

Cloning of cDNAs encoding SODs from lettuce plants which show differential regulation by arbuscular mycorrhizal symbiosis and by drought stress

Juan M. Ruiz-Lozano1, Carlos Collados, José M. Barea and Rosario Azcón

Departamento de Microbiología del Suelo y Sistemas Simbióticos, Estación Experimental del Zaidín (CSIC), Profesor Albareda No. 1, E-18008 Granada, Spain

Abstract

In the present study three cDNA fragments were cloned using degenerate primers for Mn-sod genes and PCR: two showed a high degree of identity with Mn-sods from plants and the third with Fe-sod. Arbuscular mycorrhizal (AM) symbiosis down-regulated their expression pattern under well-watered conditions. In contrast, AM symbiosis in combination with drought stress considerably increased the expression of the Mn-sod II gene and this correlated well with plant tolerance to drought. These results would suggest that mycorrhizal protection against oxidative stress caused by drought may be an important mechanism by which AM fungi protect the host plant against drought.

Key words: Arbuscular mycorrhiza, drought stress, oxidative stress, SOD.


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