Uptake and translocation of iron from ferrated rhodotorulic acid in tomato

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Abstract
Microorganisms may develop an Fe-deficiency stress when grown in an alkaline environment and secrete ferric-specific chelators known as siderophores. Some of these siderophores may have stability constants which can exceed 30. This is comparable to the synthetic Fe chelate FeEDDHA [ferric ethylenediamine di(O-hydroxyphenyl)acetate]. A study was made to determine if the Fe-efficient ''T3238-FER'' tomato and the Fe-inefficient ''T3238-fer'' tomato could use Fe supplied as the siderophore ferrated-rhodotorulic acid. After these 2 tomato cultivars were grown with adequate nutrition to obtain plants large enough for experimental testing, they were grown without Fe until Fe deficiency stress symptoms developed and then Fe was supplied as ferrated rhodoturulic acid. Fe-efficient ''T3238-FER'' tomato utilized Fe supplied as the siderophore and greened, whereas the Fe-inefficient ''T3238-fer'' tomato plants were chlorotic because of inability to use the Fe in the siderophore. Some higher plants subjected to various degrees of Fe deficiency stress in nutrient culture may derive their Fe requirement from siderophores of microbial origin.