Reduction of iron (Fe³⁺to Fe²⁺) by tumorous crown gall cells of sunflower

J.C. Brown Department of Agronomy and Horticulture, Brigham Young University, Provo, Utah, y

R.E. Terry Department of Agronomy and Horticulture, Brigham Young University, Provo, Utah, y

V.D. Jolley Department of Agronomy and Horticulture, Brigham Young University, Provo, Utah, y

B.G. Hopkins Department of Agronomy and Horticulture, Brigham Young University, Provo, Utah, y

Abstract

Tumorous crown gall tissue induced on the stems of sunflower (Helianthus annus L. cv. Mammoth Russian) plants by the soil bacterium Agrobacterium tumefaciens strongly reduced Fe³⁺ to Fe²⁺ as evidenced by the formation of Fe²⁺ BPDS complex compared to surrounding “normal” stem tissue. Tumorous tissue contained significantly more Fe, Cu, K, and P, and less Zn and Mg than the nontumorous stem tissue. The reducing environment of the tumorous tissue appears to affect the general nutrition and growth of this tissue.

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Reduction of iron (Fe³⁺to Fe²⁺) by tumorous crown gall cells of sunflower

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Reduction of iron (Fe3+to Fe2+) by tumorous crown gall cells of sunflower

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Reduction of iron (Fe³⁺to Fe²⁺) by tumorous crown gall cells of sunflower