Selection for tolerance and susceptibility to aluminium within Trifolium repens L.

Evaluation of aluminium‐tolerant white clover(Trifolium repens)selections on East Otago upland soils

“…A recent white clover breeding programme has produced selections for aluminium (Al) tolerance (Caradus et al 1987(Caradus et al , 1991Mackay et al 1990). In pot studies, tolerant genotypes were able to grow roots deeper into Al-toxic soil and maintain lower 142 New Zealand Journal of Agricultural Research, 2001, Vol.…”

“…The soils at all si t es were s a mpl ed (0-e^^ ™ *e east Otago uplands, where Lowther 75 mm) for determination of soil chemical ( ,1991( ) andMclntosh et al (1984 Table 1 Legumes evaluated on three sites with different extractable soil Al levels. Origins of the Al-tolerant and Al-susceptible white clovers are described in Caradus et al (1987Caradus et al ( ,1991, and Mackay et al (1990). Accession numbers are from the Margot Forde Germplasm Centre.…”

Response to soil aluminium of two white clover (Trifolium repens L.) genotypes

“…While variation between natural populations (Caradus, 1987) or cultivars (Mackay et al, 1990) of white clover for tolerance to A1 has not been demonstrated, tolerant and susceptible genotypes have been identified within cultivars on the basis of shoot growth (Caradus, 1987;Caradus et al, 1991). Aluminium tolerance in white clover appears to be inherited predominantly as a recessive character (Caradus et al, 1991), however in some genotypes A1 tolerance was inherited as a dominant character.…”

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

“…Stolon tip cuttings of four white clover genotypes previously selected for tolerance (Genotypes 77,97) or relative susceptibility (Genotypes 28,129) to Al (Caradus et al 1991) were rooted in sand. The rooted cuttings were transplanted into individual 75-mm diameter pots of a commercial potting mix and grown on a clean table in the glasshouse in which the Rhizobium experiment was to be located.…”

“…Selection within white clover {Trifolium repens L.) for aluminium (Al)-tolerant genotypes to form the basis of a synthetic cultivar adapted to acid, Altoxic soils, has identified plants with more (and less) Al tolerance than the average of the parent lines (Caradus et al 1991). The selections were done in non-sterile soil which would have contained a variety of Rhizobium strains because New Zealand pasture soils are infested with this bacterium (Greenwood 1961(Greenwood , 1964.…”