Effect of total light energy on symptoms and growth of ring rot-infected Red Pontiac potato plants |
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| Authors: | G A Nelson G C Kozub |
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| Institution: | 1. Agriculture Canada Research Station, T1J 4B1, Lethbridge, Alberta, Canada
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| Abstract: | The effect of total light energy levels on development of bacterial ring rot symptoms caused byCorynebacterium sepedonicum (Spieck. and Kotth.) Skapt. and Burkh., and growth (plant height) of cv. Red Pontiac was investigated by growing inoculated and uninoculated rooted stem cuttings under different pre-inoculation and post-inoculation total light energy levels. Infected plants grown under a 45 mW cm?2 hr pre-inoculation total light energy level had a higher (P< 0.01) mean ring rot severity rating than plants grown under 103 mW cm?2 hr. Disease severity increased as the postinoculation total light energy decreased. Plants inoculated withC. sepedonicum showed little growth under a post-inoculation total light energy of 45 mW cm?2 hr, however, under 103 mW cm?2 hr; significantly greater growth occurred. Uninoculated plants grew more rapidly than infected plants under all pre-and post-inoculation total light energy level combinations, except those grown at pre-inoculation levels of 45 mW cm?2 hr. |
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