The effect of ethylene and abscisic acid on symptom expression of bacterial ring rot in eggplant and potato |
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| Authors: | Chester J Kurowski Neil C Gudmestad |
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| Institution: | 1. Dept. of Botany/Plant Pathology, University of Maine, 04401, Orono, ME
2. Dept. of Plant Pathology, North Dakota State University, 58105, Fargo, ND
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| Abstract: | Studies were performed to determine the effect that plant hormones involved with plant senescence (i.e., ethylene and abscisic acid) and photoperiod have on disease development and symptom expression of bacterial ring rot (BRR) caused byCorynebacterium sepedonicum (Spieck & Kotth.) Skapt & Burkh. Potato plants were grown either under a long (14 hr.) or short (10 hr.) photoperiod, while eggplants were grown only under a short (10 hr.) photoperiod. Disease severity ratings of BRR were found to be significantly higher (P=0.05) on potato plants grown under a short photoperiod compared to a long photoperiod. Plant heights of BRR infected plants were found to be significantly greater under the long photoperiod. Endogenous levels of ethylene were found to be significantly (P=0.05) greater in inoculated potato plants grown under a long photoperiod than inoculated plants grown under a short photoperiod. Results suggest that the plant hormones ethylene and abscisic acid do not significantly affect the disease development and symptom expression of BRR. |
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