Abstract
The precursory role of avenic acid A (AVA) in the biosynthesis of the mugineic acid family (MAs) of phytosiderophores was studied by feeding 14C or 15N labeled compounds into iron-deficient oat roots (Avena sativa L. cv. Onward). Carbon-14 of methionine was incorporated into AVA and 2′-deoxymugineic acid (DMA) in the oat roots, while 14C of homoserine was not incorporated into either AVA or DMA. The molar radioactivity of DMA was higher than that of AVA. Incorporation of 15N into MAs was examined by feeding 15N-ammonium sulfate into oat roots. The value of 15N atom-% excess of DMA was higher than that of AVA.
These results indicate that methionine, rather than homoserine, is the direct precursor of MAs in oat, which is similar to that in barley, and that AVA is not the precursor of the other MAs.
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© 1995 Springer Science+Business Media Dordrecht
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Kawai, S., Sasaki, O., Hayasaka, Y., Takagi, SI. (1995). Short communication: Biosynthesis of avenic acid A in oat cv. Onward: Studies with 14C or 15N labeled compounds. In: Abadía, J. (eds) Iron Nutrition in Soils and Plants. Developments in Plant and Soil Sciences, vol 59. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0503-3_42
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DOI: https://doi.org/10.1007/978-94-011-0503-3_42
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