Solution Culture Evaluation of Sweet Potato Cultivar Tolerance to Aluminum1
- D. A. Munn and
- R. E. McCollum2
A technique was desired that would permit screening of sweet potato [Ipomoea batatas (L.) Lamarck] cultivars for differential tolerance of Al in the root environment. Such a technique would be desirable to identify cultivars which would be adapted to acid soils where AI toxicity was a problem, or to identify A1 resistant cultivars for use in a plant breeding program. A solution culture technique was developed using a solution 0.25 mM CaCl2 14μM H3BO3, and 0 to 25μM Al2(SO4)3 at a pH of 4.5 to assess the relative Al damage to root initiation and root growth by stem cuttings of sweet potato. The technique was used to evaluate the Al tolerance of six sweet potato cultivars representing a spectrum of the cultivars grown in the southeast US. Root growth was assessed by measuring root weight, root length, and root length relative to the zero Al treatment (RRL). The six cultivars were ranked according to their ability to sustain root growth in the presence of Al (RRL) in the following order: ‘Australian Canner’ > ‘Centennial’ > ‘Pelican Processor’ > ‘Nugget’ > ‘White Star’ > ’Jewell.’ There were significant differences between cultivars in ability to sustain root growth in the presence of low levels of Al.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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