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Journal of Experimental Botany, Vol. 51, No. 348, pp. 1179-1188, July 2000
© 2000 Oxford University Press

Original papers

Induced activity of adenine phosphoribosyltransferase (APRT) in iron-deficient barley roots: a possible role for phytosiderophore production

Reiko Itai1, Kazuya Suzuki2, Hirotaka Yamaguchi2, Hiromi Nakanishi1, Naoko-Kishi Nishizawa1, Etsuro Yoshimura1 and Satoshi Mori1,2,3

1 Laboratory of Plant Molecular Physiology, Department of Applied Biological Chemistry, The University of Tokyo, 1–1 Yayoi, Bunkyo-ku, Tokyo 113–8657, Japan
2 Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Corporation, 2–1-6 Sengen, Tsukuba 305–0047, Japan

To isolate the genes involved in the response of graminaceous plants to Fe-deficient stress, a protein induced by Fe-deficiency treatment was isolated from barley (Hordeum vulgare L.) roots. Based on the partial amino acid sequence of this protein, a cDNA (HvAPT1) encoding adenine phosphoribosyltransferase (APRT: EC 2.4.2.7) was cloned from a cDNA library prepared from Fe-deficient barley roots. Southern analysis suggested that there were at least two genes encoding APRT in barley. Fe deficiency increased HvAPT1 expression in barley roots and resupplying Fe to the Fe-deficient plants rapidly negated the increase in HvAPT1 mRNA. Analysis of localization of HvAPT1- sGFP fusion proteins in tobacco BY-2 cells indicated that the protein from HvAPT1 was localized in the cytoplasm of cells. Consistent with the results of Northern analysis, the enzymatic activity of APRT in barley roots was remarkably increased by Fe deficiency. This induction of APRT activity by Fe deficiency was also observed in roots of other graminaceous plants such as rye, maize, and rice. In contrast, the induction was not observed to occur in the roots of a non-graminaceous plant, tobacco. Graminaceous plants generally synthesize the mugineic acid family phytosiderophores (MAs) in roots under Fe-deficient conditions. In this paper, a possible role of HvAPT1 in the biosynthesis of MAs related to adenine salvage in the methionine cycle is discussed.

Key words: APRT, barley, Fe deficiency, methionine cycle, mugineic acid.


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