Evaluation of aluminum indices to predict aluminum toxicity to plants grown in nutrient solutions

Journal Article · Wed Jan 01 00:00:00 EST 1986 · Commun. Soil Sci. Plant Anal.; (United States)

DOI:https://doi.org/10.1080/00103628609367789· OSTI ID:6896931

Alva, A K; Blamey, F P.C.; Edwards, D G; Asher, C J

Difficulty has been experienced in establishing a suitable aluminum (Al) index to predict Al toxicity to plants grown in nutrient solutions with a wide range of properties. In the present study, relationships were evaluated between root length and (i) concentration of total Al, (ii) concentration of monomeric Al, and (iii) the sum of the activities of monomeric Al species (..sigma..a/sub Al mono/) in solution. Results are reported for soybean (Glycine max (L.) Merr.), subterranean clover (Trifolium subterraneum L.), alfalfa (Medicago sativa L.), and sunflower (Helianthus annuus L.). Total Al concentration in solution, comprising polymeric and monomeric Al species, was a poor index of Al toxicity, confirming the hypothesis that only monomeric Al is toxic to root growth. In solutions with widely differing composition, the concentration of monomeric Al also proved unsatisfactory due to ionic strength effects on the activities of monomeric Al species. ..sigma..a/sub Al mono/ was the best index of Al toxicity, accounting for 72 to 92% of the variation in root length depending on the plant species. Root length was reduced by 50% at ..sigma..a/sub Al mono/ of 7-16 ..mu..M in soybean, 13 ..mu..M in subterranean clover and alfalfa, and 11 ..mu..M in sunflower.

• Research Organization: Univ. of Queensland, St. Lucia, Australia
• OSTI ID: 6896931
• Journal Information: Commun. Soil Sci. Plant Anal.; (United States), Vol. 17:12
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ALFALFA
PLANT GROWTH
ALUMINIUM
TOXICITY
CLOVER
GLYCINE HISPIDA
SUNFLOWERS
FORECASTING
ROOTS
BACTERIA
ELEMENTS
GROWTH
LEGUMINOSAE
METALS
MICROORGANISMS
PLANTS
RHIZOBIUM
560300* - Chemicals Metabolism & Toxicology