Effects of Leaf Infections by Septoria nodorum Berk. on the Translocation of 14C-labelled Assimilates in Spring Wheat

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Abstract
The influence of infection with Septoria nodorum of leaves below the flag leaf on the translocation of 14C-labelled assimilates in wheat was followed. In the vegetative phase export of assimilates from a single infected leaf was reduced, but export from a healthy leaf on a heavily infected plant was increased. During the reproductive phase export from leaves was not affected by disease. Heavy leaf infection had little effect on the patterns of distribution of export especially during reproductive growth when only changes in the proportion of assimilates in leaf sheaths and tiller stumps were found. Distribution of export from a healthy flag leaf on an otherwise heavily infected plant was unaltered. During vegetative growth changes in the distribution of assimilates were more marked, the greatest changes occurring when a single infected leaf on a healthy plant was exposed to 14CO2.

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