Record ID No. |
362 |
Author(s) |
Andrade S.A.L., Abreu C.A., de Abreu M.F., Silveira A.P.D* , 2004 |
Affiliation |
*IAC (Institute of Campinas), Institute of Agron, Ctr Pesquisa & Desenvolvimento Recursos Agroambie, Caixa Postal 28, BR-13001970 Campinas, SP, Brazil |
Title |
Influence of lead additions on arbuscular mycorrhiza and Rhizobium symbioses under soybean plants |
Source. Vol.(no):Page |
Applied soil ecology, 26(2), 123-131p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Biological Interaction |
Sub-subjects |
Nodule forming nitrogen fixers |
Host |
Glycine max, Soybean |
Organism |
Glomus macrocarpum, Bradyrhizobium |
Country |
Brazil, S. America |
Abstracts |
The influence of the arbuscular mycorrhizal fungus
(AMF) Glomus macrocarpum Tul. and Tul. on
Bradyrhizobium-inoculated soybean (Glycine max L. Merrill var.
IAC-14) growth, nutrients and Pb uptake was studied in soils
with different levels of Pb. Mycorrhizal and non-mycorrhizal
plants were grown in a soil amended with 0, 150, 300 and 600 mg
dm(-3) of Pb, using Pb(NO3)(2), and plants were harvested at two
different growth stages: flowering and maturity. Soybean shoot
dry weights were not affected by increasing doses of lead in the
soil, but the number of pods decreased significantly. Nodule dry
weights of mycorrhizal roots were reduced by soil Pb additions,
although the mycorrhizae stimulated plant nodulation
significantly. The inoculation of AMF in soybeans provided
higher rates of nutrients uptake, mainly P, inducing greater
mycorrhizal-soybean growth. Thus, mycorrhizae improved Pb
uptake, produced shoots with Pb concentrations 30% lower than
those of non-mycorrhizal plants, at the highest Pb concentration
added to the soil. AM fungus was more susceptible to the higher
Pb doses added to the soil than the soybean plants, decreasing
both root AM colonisation and spore production. This work
indicated that a concentration of 600 mg dm(-3) of Pb in the
soil interfered with the establishment of double symbioses
between AMF and Bradyrizhobium, and with the fungus perpetuation
in the soil
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