Abstract
Selection and breeding of crops for aluminium (Al) tolerance is a useful approach to increase production on acid soils. This requires a rapid and reliable system to discriminate between Al-tolerant and Al-sensitive genotypes. A hydroponic system was developed to screen for Al tolerance in barley (t Hordeum vulgare L.) to overcome several problems encountered in previous screening methods. Four levels of Al (5, 10, 20, and 40 μt M) in 1 mt M CaCl2 solution at pH 4.5 were used to rank lines for Al-tolerance. Each line was cultured in a different compartment to eliminate chemical and pH interactions among lines. To avoid changes in Al tolerance due to other factors such as the calcium (Ca) concentration of the solution, Al-tolerant (Atlas 66) and Al-sensitive (Scout 66) cultivars of wheat (t Triticum aestivum L.) were used as reference cultivars. Five ranks of Al tolerance from highly tolerant to highly sensitive were established by comparison with each reference. Eriochrome cyanine R staining was used for the rapid evaluation of Al tolerance. This screening system allowed classification of about 50 barley lines into five different Al tolerance groups within one week. Using this system, screening of ca. 600 barley lines from various regions of the world was conducted. Most lines were sensitive to Al, but ninety lines showed intermediate Al-tolerance. Thirty nine lines were highly sensitive to Al in solution.
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Ma, J.F., Zheng, S.J., Li, X.F. et al. A rapid hydroponic screening for aluminium tolerance in barley. Plant and Soil 191, 133–137 (1997). https://doi.org/10.1023/A:1004257711952
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DOI: https://doi.org/10.1023/A:1004257711952