The distribution of five major nutrients in barley plants infected with brown rust

Ahmad, Iftikhar; Owera, S.A.P.; Farrar, J. F.; Whitbread, R.

doi:10.1016/0048-4059(82)90068-6

Cited by 25 publications

(39 citation statements)

References 29 publications

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“…Data from this paper and Ahmad et al (1982Ahmad et al ( , 1983 are combined in Figure 4(a) to produce a budget for P fluxes in control barley leaf blades. The largest flux is only adjacent compartments can communicate directly.…”

Section: Discussionmentioning

confidence: 99%

“…The largest flux is only adjacent compartments can communicate directly. Sources of data: chloroplasts, Ahmad et al (1983); xylem and phloem, Ahmad et al (1982); control pool sizes and membrane fluxes. Table 9, this paper; rusted pool sizes, as control plus assumptions given in text.…”

Section: Discussionmentioning

confidence: 99%

“…Phosphorus was extracted and determined as described previously (Ahmad et al, 1982). Xylem sap was collected by detopping the plants as described previously (Ahmad e^ a/., 1982).…”

Section: Methodsmentioning

confidence: 99%

“…The concentration of phosphorus in rust infected leaves rises to more than twice control levels, relatively higher than any other element measured (Ahmad et al, 1982), and this phosphorus appears to accumulate at infection sites (Gottlieb & Garner, 1946;Johnson, Schafer & Leapold, 1966). Much of the phosphorus may occur as polyphosphate (Bennet & Scott, 1971), which is common in fungi (Kulaev, 1979;Beevers & Burns, 1980).…”

Section: Introductionmentioning

confidence: 99%

“…The purpose of this paper is to provide such a budget, and accordingly we present data for the first leaf of barley infected with brown rust, confining measurements to the eighth day after infection, when sporulation occurs. We have previously reported that the flux into infected leaves through xylem is not appreciably changed by disease, whilst export in the phloem is reduced greatly (Ahmad et al, 1982) and that chloroplasts from infected leaves show increased phosphorus contents (Ahmad, Farrar & Whitbread, 1983). The measurements presented here explore phosphorus movement after application of ^^P to the root and the tip of the diseased leaf; fractionation of phosphorus compounds; the source of P entering spores; and compartmentation of P between apoplast, cytoplasm and non-labile pools using isotope efflux kinetics.…”

Section: Introductionmentioning

confidence: 99%

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Fluxes of Phosphorus in Leaves of Barley Infected With Brown Rust

1984

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SUMMARYThe movement of ^^P, fractionation of ^^P and unlabelled phosphorus, and efflux of ^^P from leaf discs, in control and brown-rust infected first leaf blades of barley are described for the day of sporulation, 7 d after infection. It is shown that P retranslocation is greatly reduced by disease, that the concentration of P in the infected leaf blade increases greatly and that 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. The data are used to derive P budgets for control and infected leaf-blades, and the significance of P to the diseased state is discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…Phosphorus was extracted and determined as described previously (Ahmad et al, 1982). Xylem sap was collected by detopping the plants as described previously (Ahmad e^ a/., 1982).…”

Section: Methodsmentioning

confidence: 99%