Differential Response of Oats to Manganese Stress
1974
Brown, J. C. | Jones, W. E.
Oat (Arena sativa L.) varieties differ in their susceptibility to Mn deficiency. A Mn-efficient plant utilizes a limited supply of Mn, whereas a Mn-inefficient plant, grown under identical conditions, develops Mn-deficiency symptoms. The objective of this study was to characterize these differences. Four Mn-inefficient oat varieties (‘Star,’ ‘Maelor,’ ‘Cayuse,’ and ‘Vicland’) and four Mn-efficient oat varieties (‘S171,’ ‘Avon,’ ‘Park,’ and ‘Golden Rain’) were grown in nutrient solution containing increasing amounts of Mn. All of the Mn-inefficient varieties except Star developed Mn-deficiency symptoms when grown at 0.005 mg/liter Mn. None of the Mn-efficient varieties developed the symptoms. Concentration of Ca was consistently greater in tops of the Mn-efficient than in those of Munificent oat varieties. Where the concentration of P was increased in the nutrient solution, Vicland contained more P and less Ca than Golden Rain. It is suggested that Ca may physically substitute for Mn at nonspedfic sites in the plant, thus making more Mn available for specific chemical reactions that require it.
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