Variation for aluminium tolerance in white clover

Abstract

Aluminium (A1) tolerance of fourteen white clover (Trifolium repens L.) cultivars from eleven countries was compared in the greenhouse in the Wainui silt loam (Typic Dystrochrept) to which A1 had been added at nine levels (0, 2.5, 5, 20, 50, 150, 250, 500 and 750mgkg -1 of soil) as AI 2 (504) 3 and incubated for 30 days. None of the white clover cultivars, including those either referred to as Al-tolerant, Dusi and Pathfinder, or from countries that have large areas of acid soils, E1 Lucero M.A.G, Bayucua, Bage and Zapican, showed greater Al-tolerance than 'Grasslands Huia' white clover. Subsequent screening for Al-tolerance can therefore be restricted to germplasm with wide agronomic adaptation.

Rhizobiumstrain × host genotype interactions for white clover(Trifolium repensL.) genotypes with different aluminium tolerances

“…Early in the experimental screening for Al tolerance in white clover, no cultivar differences were found but genotypic variation was recorded. A decision was made to restrict selection to germplasm with wide agronomic adaptation (Mackay et al 1990). All the genotypes used in this experiment were selected from within 'Grasslands Huia' white clover.…”

Toxicological Benchmarks for Screening Potential Contaminants of Concern for Effects on Terrestrial Plants

“…Seedling establishment of white clover (Trifolium repens L.) in a silt loam soil (pH 5.0) was reduced approximately 30% by the addition of 50 ppm Al as Al (SO ) 2 4 3 (Mackay et al, 1990), the lowest concentration tested. This lone study does not allow a high degree of confidence in the benchmark.…”

Effect of different aluminium and phosphorus levels on aluminium-tolerant and aluminium-susceptible genotypes of white clover (Trifolium repensL.)

“…The soil used previously in the experimental programme (Wainui silt loam-a Typic Dystrochrept, Mackay et al 1990;Crush & Caradus 1992) was mixed with factorial combinations of H 3 P0 4 at 50, 100, 200, and 400 mg P/kg dry soil and AI 2 (S04h at 20,50, 150, and 250 mg Al/kg dry soil. All the treatments received 200 mg potassium (K)/ kg dry soil as K 2 S0 4 and 0.14 mg molybdenum (Mo )/kg dry soil as ammonium molybdate.…”

“…Shoot Ca was usually higher in T77 than in S 129 at low P levels but the genotypes did not differ at the higher P levels. (Mackay et al 1990). The data confirm previous experimental results in which greater shoot growth under Al stress was recorded in the AI-tolerant T77 (Caradus et al 1991) and extend the observation to root growth.…”

“…Selection for aluminium (AI) tolerance in white clover (Trifolium repens L.) (Caradus et al 1987;Mackay et al 1990;Caradus et al 1991) has produced genotypes able to grow roots deeper into AI-toxic soil and maintain lower root Al concentrations than genotypes identified as susceptible to Al (Crush & Caradus 1992). Phosphorus (P) deficiency symptoms occur as a result of white clover suffering from Al toxicity (Jarvis & Hatch 1987) and AI toxicity is ameliorated when P fertiliser is applied to clover (Davis 1981).…”