Influence of aluminum on in vitro formation of Pinus caribaea mycorrhizae

The ability of Pinus caribaea var. hondurensis to form mycorrhizae was determined in vitro with seven species of ectomycorrhizal fungi in the presence of six levels of Al (added as AlCl₃) in a nutrient solution. The time required for mycorrhizal formation, the number of mycorrhizal root tips and the...

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Bibliographic Details
Published in:Plant and soil 1990-05, Vol.124 (1), p.73-77
Main Authors: Kasuya, M.C.M. (Universidade Federal de Vicosa, Vicosa, MG (Brazil). Dept. de Biologia Geral), Muchovej, R.M.C, Muchovej, J.J
Format: Article
Language:English
Subjects:
Acid soils
ALUMINIO
ALUMINIUM
Aluminum
Fungi
MYCORHIZE
MYCORRHIZAE
Pine trees
PINUS CARIBAEA
Plant roots
Soil fungi
Soil toxicity
Toxicity
Tropical soils
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Summary:The ability of Pinus caribaea var. hondurensis to form mycorrhizae was determined in vitro with seven species of ectomycorrhizal fungi in the presence of six levels of Al (added as AlCl₃) in a nutrient solution. The time required for mycorrhizal formation, the number of mycorrhizal root tips and the percent mycorrhizae were measured after 15, 30, 60, 90 and 120 days. Cenococcum graniforme was susceptible to Al toxicity at all Al concentrations. Pisolithus tinctorius and Suillus sp. were depressed at lower but stimulated at higher Al concentrations. The inverse was shown for Rhizopogon reaii and Hebeloma cylindrosporum. Tolerance to Al was verified for R. nigrescens and H. crustuliniforme. Pisolithus tinctorius had the largest mycorrhizal capacity, defined as the sum of the values for time, percent and number of mycorrhizae. Ectomycorrhizal fungi appeared to ameliorate Al damage to plant roots even in treatments where no mycorrhizae formed. Inoculation of pine seedlings with Al-tolerant mycorrhizal fungi is likely to improve reforestation efforts in highly-weathered tropical soils.
ISSN:0032-079X
1573-5036
DOI:10.1007/BF00010933