Translocation from leaves of barley hordeum distichum cultivar maris mink infected with brown rust puccinia hordei

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

New Phytologist 94(1): 111-124


ISSN/ISBN: 0028-646X
Accession: 006829092

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Translocation of 14C from first leaves of barley is reduced by rust infection. Infection of the leaf base alone results in enhanced loss of 14C from the leaf tip, while infected leaf tips show greatly reduced loss. Concentrations of soluble sugar are lower and those of storage polysaccharide higher in rusted leaves. Their amounts and the kinetics of flux of 14C through them are used to validate a compartmental model of translocatory C flux derived from the pattern of 14C-efflux from the leaf. This model suggests that the major consequences of infection are reduced size of the sucrose transport pool and elimination of a phase of efflux with a half-life of 2 h.