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Fluctuation in amount of starch in host plants invaded by rust and mildew fungi



Fluctuation in amount of starch in host plants invaded by rust and mildew fungi



Phytopathology 56(11): 1220-1224



Starch content of leaves of Phaseolus vulgaris 'Topcrop' injected with Uromyces phaseoli var. typica race 32 decreased 90% within 24 hr after inoculation. Four hr after inoculation, the starch content had decreased 50%. The amount of starch increased sharply just before and during sporulation, then dropped sharply after sporulation. The dry weight of the host tissue increased during sporulation but did not decrease following sporulation, Hordeum vulgare inoculated with Erysiphe graminis f. sp. hordei, grown in alternating light and dark, and analyzed at 12-hr intervals up to 72 hr after inoculation had less starch than healthy plants at all times of sampling except 36 hr. Under continuous illumination, the magnitude of the decrease in starch content in infected leaves was greater than that in noninfected leaves except at 36 hr. Avena sativa "C.I. 7908"inoculated with Puccinia graminis f. sp. avenae race 6AF exhibited a bimodal increase in starch synthesis: one at 3 days before any symptom expression and the other at 7 days which corresponded to sporulation.

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Accession: 014482772

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