Abstract
The cabbage root fly Delia radicum L. (Diptera: Anthomyiidae) is one of the major pests of many Brassica crops in the temperate areas of Europe and North America. At present, turnip (B. rapa ssp. rapa L.) varieties resistant to the pest does not exist. With the aim to fill this gap, a no-choice tolerance test of 56 accessions among turnips, turnip tops and turnip greens was performed under controlled conditions by introducing D. radicum eggs. Plant survival, leaf and root conditions, pupae number and weight significantly varied among plant accessions. Ten putatively resistant and ten susceptible accessions (control group) were selected from this first screening, transplanted in the field and exposed to natural infestation to detect antibiosis and antixenosis mechanisms. Both in the laboratory and in the field, pupae number significantly varied within accessions and between resistant and susceptible group, although pupal weight did not, indicating the absence of antibiosis effect on this early stage. In the field, the number of galleries was significantly lower in the resistant group in comparison with the control. Resistant accessions had smaller size, and a smaller, white and mostly buried root. Within the resistant and susceptible accessions, larger plants harboured more pupae, however purple roots were those most preferred, and the hosted pupae weighed most. Three accessions from the resistant group (MBGBR0178, MBGBR0570 and MBGBR0371) stand out for resistance to D. radicum possibly through antixenosis mechanisms.
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Acknowledgements
Research was supported by the National Plan for Research and Development AGL-2012-35539, AGL2015-66256-C2-1-R and financed by the European Regional Development Funds (FEDER). Authors thank Fátima Nogueira Míguez, Rosaura Abilleira, and César González, for their valuable help during laboratory and field works. Serena Santolamazza-Carbone acknowledges a post-doctoral research contract (JAE-Doc) from the Consejo Superior de Investigaciones Científicas (CSIC).
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Santolamazza-Carbone, S., Velasco, P. & Cartea, M.E. Resistance to the cabbage root fly, Delia radicum (Diptera, Anthomyiidae), of turnip varieties (Brassica rapa subsp. rapa). Euphytica 213, 274 (2017). https://doi.org/10.1007/s10681-017-2069-z
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DOI: https://doi.org/10.1007/s10681-017-2069-z