Genetic variation in chrysanthemum for resistance toFrankliniella occidentalis |
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Authors: | C M de Jager R P T Butt P G L Klinkhamer T J de Jong K Wolff E van der Meijden |
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Institution: | (1) Institute of Evolutionary and Ecological Sciences, University of Leiden, P.O. Box 9516, 2300 RA Leiden, The Netherlands |
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Abstract: | In a choice-experiment, 42 chrysanthemum cultivars were screened for resistance toFrankliniella occidentalis (Pergande). Oviposition preference, two types of feeding damage and thrips numbers per flower were recorded as measures of
resistance. A large genetic variation in thrips resistance was found among the cultivars screened. The amount of feeding damage
was strongly determined by oviposition preference. Besides, a positive correlation was found between the oviposition preference
in non-flowering chrysanthemums (number of eggs) and flowering chrysanthemums (number of thrips per flower). Thrips feeding
on young, developing tissues, causes growth damage because affected cells are unable to expand and leaves become distorted.
Thrips feeding on older, expanded leaves causes cells to become filled with air, resulting in ‘silver’ damage. The amounts
of growth-and ‘silver’ damage were negatively correlated suggesting that thrips chose either young or older leaves to feed
on. The order of resistance among cultivars did not change during the experiment. In order to get more insight in resistance
mechanisms the influence of some plant- and flower characters on resistance was examined. The plant characters height, number
of leaves, flower production and flower weight were all negatively correlated with resistance. It is suggested that tall chrysanthemum
cultivars with many and large flowers may invest less in defence than smaller cultivars, and therefore are more damaged by
thrips. |
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Keywords: | Dendranthema grandiflora Frankliniella occidentalis Thysanoptera Thripidae oviposition preference feeding damage host plant resistance resistance mechanisms |
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