Differential Tolerance of Cotton Varieties to Excess Manganese
1969
Foy, C. D. | Fleming, A. L. | Armiger, W. H.
Cotton varieties adapted to various regions of the Cotton Belt of the United States showed differential leaf crinkling symptoms and growth in greenhouse pots of acid Manteo soil (pH 4.5) from Orange, Va, Subsequent experiments with soils and nutrient solutions containing variable Mn confirmed the hypothesis that the plant symptoms were due to Mn toxicity; however, other evidence indicated that Al toxicity was more important than Mn toxicity in limiting growth. Cotton varieties showing the greatest tolerance to excess Mn in soils or nutrient solutions were ‘Rex Smooth Leaf’ (Arkansas), ‘Acala 1517D’ (New Mexico), and ‘Gregg’ (Texas). Varieties showing the least tolerance were ‘Acala 4-42’ (California) and ‘Coker 100A’ (South Carolina). Tolerance of some varieties was attributed to the fact that they or their ancestors were developed on high-Mn soils. Greater Mn tolerance of the Rex Smooth Leaf variety appears to be due not to reduced Mn uptake but to a greater ability to tolerate a high level of Mn in its tops. Cotton varieties having greatest tolerance to Mn were not necessarily those showing greatest tolerance to Al in a previous study.
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