Arbuscular mycorrhiza activates the expression of a metallothionein encoding plant gene in Pisum sativum L.
DOI:
https://doi.org/10.33885/sf.2006.3.964Keywords:
Arbuscular mycorrhiza, cadmium, metallothionein, Pisum sativumAbstract
In order to analyze expression of a metallothionein (MT) encoding plant gene in the arbuscular
mycorrhizal symbiosis, transcript quantification was carried out using wild-type (cv. Finale)
and a defective myc genotype mutated for the gene (RisNod24), where the fungal partner is not
able to form functional arbuscules. Roots of -inoculated cv. Finale were colonized by the
mycorrhizal fungus but not nodulated and all stages of fungal development were present three to five
weeks after inoculation. Only appressoria and hyphae were present in roots of the mutant RisNod24, but
no arbuscules. After three and five week's development, the intensity of root cortex colonization in cv.
Finale plants was 61% and 50%, respectively, while roots of the mutant RisNod24 exhibited 7% and 5%,
respectively. The expression profile of the MT-encoding gene in roots of both pea genotypes was similar
after one week development. However, in three and five week-old cv. Finale accumulation of the
transcripts was ten and two-fold higher, respectively, than in the mutant RisNod24. The protein encoded by
the gene could be involved in metal transport and/or homeostasis as well as in strategies of tolerance
of heavy metal toxicity in the mycorrhizal symbiosis.
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