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Response of Phaseol Us Vulgaris To a Single Generation of Meloidogyne Incognita

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For more content, see Nematology.

One week-old Phaseolus vulgaris plants were inoculated with 0, 2000, 4000 & 8000 Meloidogyne incognita juveniles/plant and grown under controlled conditions (21°C, 14 h day at 400 μE.m-2.s-1, 16°C, 10 h night cycle). At intervals up to 28 d after inoculation, morphological and physiological characteristics of the bean plants were measured using destructive and nondestructive assays. Nematodes significantly decreased total carbon, hydrogen, and nitrogen content, and plant dry weight from 8 d, and flowers, pods, seeds and leaf area after 15 d. Plant respiration rate was not significantly changed by nematode infection, but photosynthetic rate, based on leaf area and/or chlorophyll and nitrogen content decreased within one wk and chlorophyll content within two. Chlorophyll content and photosynthetic rate for all treatments decreased with time. The interaction between the physiological and chronological age of the nematode and host in relation to the diminished productivity of infected plants is discussed.

Affiliations: 1: Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnaby, Vancouver, British Columbia, Canada, V5A 1S6


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