Fluxes of phosphorus in leaves of barley hordeum distichum cultivar maris mink infected with brown rust

Ahmad, I.; Farrar, J.F.; Whitbread, R.

New Phytologist 98(2): 361-376


ISSN/ISBN: 0028-646X
Accession: 005473668

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The movement of 32P, fractionation of 32P and unlabeled P, and efflux of 32P from leaf discs, in control and brown-rust [incited by Puccinia hordei] infected 1st leaf blades of barley are described for the day of sporulation, 7 days after infection. P retranslocation is greatly reduced by disease, the concentration of P in the infected leaf blade increases greatly and the increase is probably largely in the fungus, and partly in the form of polyphosphate. The P content of fungal spores is derived largely from P currently entering the leaf in the xylem. P budgets for control and infected leaf-blades are derived, and the significance of P to the diseased state is discussed.