Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 19:9-11 (1979)
© 1979 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Relative Responses of Four Flax-Rust Differential Lines to FeEDDHA1

J. T. Moraghan and P. Ralowicz2

Flax (Linum usitatissimum L.) accumulates Mn and develops Mn toxicity symptoms when grown on certain soils low in available Fe. Application of FeEDDHA decreases Mn accumulation and eliminates Mn toxicity symptoms in such cases. This greenhouse study compares the susceptibility of four closely related flax lines (Differentials 1, 3, 16, and 17) used in rust (Melampsora lini) studies, to Mn toxicity and the response to soil-applied FeEDDHA. Differential 3 showed the most response to the added chelate. A preplant soil application of 2 ppm FeEDDHA-Fe eliminated the lower leaf scorch presumably associated with Mn toxicity, increased total dry matter yield and Fe accumulation, and decreased Mn accumulation in above-ground parts of all four lines. However, dry matter yield of Differential 3 was increased 81% after 64 days as compared to 27, 18, and 33% for Differentials 1, 16, and 17, respectively. Genotype, either in the presence or absence of FeEDDHA, had little effect on Mn and Fe concentration, indicating factors besides uptake and concentration of these ions are responsible for the poor growth of Differential 3 in certain soils low in available Fe. Phosphorus and Zn concentrations were not apparently related to the greater susceptibility of Differential 3 to Mn toxicity.

Key Words: Melampsora • Plant Fe • Plant Mn • Linum usitatissimum L.

1 Contribution from Deps. of Soils and Plant Pathology, North Dakota State Univ., Fargo, ND 58102. Published with the approval of the Director.

2 Professor of soils and graduate assistant, respectively.

Received for publication May 15, 1978.




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