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Acid soil tolerance mechanisms for juvenile stage sorghum (Sorghum bicolor)



Acid soil tolerance mechanisms for juvenile stage sorghum (Sorghum bicolor)



Plant soil interactions at low pH Proceedings of the second international symposium, 24-29 June 1990, Beckley, West Virginia, USA: 1037-1045



Acid soils drastically alter the environment to which sorghum [Sorghum bicolor (L.) Moench] seedlings are exposed. As pH decreased from pH 5.6 to 4.4, Mn(2+) concentrations increased 36X, Ca(2+) concentrations decreased > 10X and H+ concentration increased 20X. These ion concentration changes were shown to influence shoot and root growth by inhibition of plant growth regulator (PGR) transport, biosynthesis, and degradation. Sorghum cultivars varied, completely, in their capacity to produce alpha-amylase and isocitric lyase, both of which are GA3 induced. Root response and protection from aluminium is (at least) tripartite: mucigel, primary cell wall carboxyl groups, and metabolic absorption. Sorghum cultivar differences exist at each level.

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Accession: 002292037

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