Record ID No. |
1590 |
Author(s) |
Andrade S A L., Gratao P L., Schiavinato M A., Silveira A P D., Azevedo R A., Mazzafera P. , 2009 |
Affiliation |
Univ Estadual Campinas, Inst Biol, Dept Plant Physiol, BR-13083970 Campinas, SP, BRAZIL |
Title |
Zn uptake, physiological response and stress attenuation in mycorrhizal jack bean growing in soil with increasing Zn concentrations |
Source. Vol.(no):Page |
Chemosphere. 75(10): 1363-1370p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Biochemistry |
Sub-subjects |
Miscellaneous |
Country |
Brazil |
Abstracts |
The influence of arbuscular mycorrhizal fungi (AMF) inoculation on Canavalia ensiformis growth.
Nutrient and Zn uptake, and on some physiological parameters in response to increasing soil Zn concentrations
was studied. Treatments were applied in seven replicates in a 2 x 4 factorial design, consisting of the
inoculation or not with the AMF Glomus etunicatum, and the addition of Zn to soil at the concentrations of 0,
100, 300 and 900 mg kg(-1). AMF inoculation enhanced the accumulation of Zn in tissues and promoted biomass
yields and root nodulation. Mycorrhizal plants exhibited relative tolerance to Zn up to 300 mg kg(-1) without
exhibiting visual symptoms of toxicity, in contrast to non-mycorrhizal plants which exhibited a significant
growth reduction at the same soil Zn concentration. The highest concentration of Zn added to soil was highly
toxic to the plants. Leaves of plants grown in high Zn concentration exhibited a Zn-induced proline
accumulation and also an increase in soluble amino acid contents; however proline contents were lower in
mycorrhizal jack beans. Plants in association or not with the AMF exhibited marked differences in the foliar
soluble amino acid profile and composition in response to Zn addition to soil. In general, Zn induced oxidative
stress which could be verified by increased lipid peroxidation rates and changes in catalase, ascorbate
peroxidase, glutathione reductase and superoxide dismutase activities. In summary, G. Etunicatum was able to
maintain an efficient symbiosis with jack bean plants in moderately contaminated Zn-soils, improving plant
performance under those conditions, which is likely to be due to a combination of physiological and nutritional
changes caused by the intimate relation between fungus and plant. The enhanced Zn uptake by AMF inoculated jack
bean plants might be of interest for phytoremediation purposes. |