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New sources of resistance to lettuce aphids in Lactuca spp.

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Arthropod-Plant Interactions : Volume 6, Issue 3, September 2012

Arthropod-Plant Interactions : Volume 6, Issue 2, June 2012

Arthropod-Plant Interactions : Volume 6, Issue 1, March 2012

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Arthropod-Plant Interactions : Volume 4

Arthropod-Plant Interactions : Volume 3

Arthropod-Plant Interactions : Volume 2

Arthropod-Plant Interactions : Volume 1

New sources of resistance to lettuce aphids in Lactuca spp.

Content Provider	Springer Nature Link
Author	Cid, M. Ávila, A. García, A. Abad, J. Fereres, A.
Copyright Year	2012
Abstract	The use of resistant cultivars is one of the best ways to protect lettuce from aphid pests. At present, there are cultivars available with nearly complete resistance to Nasonovia ribisnigri biotype Nr:0 (based on the Nr gene) and partial resistance to Macrosiphum euphorbiae. Nevertheless, a new biotype of N. ribisnigri (Nr:1) able to overcome the resistance based on the Nr gene is expanding around Europe and has become a major threat of lettuce. In the present work, we report the presence of this new biotype in southeastern Spain, a major lettuce-producing region. Furthermore, a pool of 264 germplasm accessions belonging to Lactuca genus was tested in a greenhouse assay to search for new resistance sources to N. ribisnigri. The most promising accessions were retested in the laboratory to characterize the resistance by means of free-choice and antibiosis assays against biotypes Nr:0 and Nr:1 of N. ribisnigri and against a clone of M. euphorbiae. Three accessions of L. virosa showed resistance against the target aphid species and could be of interest for ongoing breeding programs. The accessions CGN16272 and CGN13361 were both partially resistant to the Nr:1 biotype of N. ribisnigri and to M. euphorbiae, and CGN13355, in spite of not being resistant to N. ribisnigri, showed a near complete resistance to M. euphorbiae. The study of the feeding behavior of N. ribisnigri biotypes showed that the Nr:1 biotype is able to maintain a similar phloem feeding ingestion pattern on genotypes bearing the Nr gene and on N. ribisnigri-susceptible lettuce genotypes. Moreover, as aphids rejected L. virosa as a feeding source due to superficial factors (high level of antixenosis), no differences in the level of antibiosis between such genotypes were detected. A second set of screening assays were conducted on 40 accessions of L. virosa in order to select for resistance against the Nr:1 biotype. The results showed three accessions with high levels of resistance (CGN05148, CGN21399 and CGN16274) against Nr:1 that could be of interest in lettuce breeding programs.
Starting Page	655
Ending Page	669
Page Count	15
File Format	PDF
ISSN	18728855
Journal	Arthropod-Plant Interactions
Volume Number	6
Issue Number	4
e-ISSN	18728847
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-07-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Antibiosis Antixenosis Free-choice trial Nr:1 Nasonovia ribisnigri Macrosiphum euphorbiae Behavioural Sciences Invertebrates Ecology Plant Pathology Plant Sciences Entomology
Content Type	Text
Resource Type	Article
Subject	Ecology Ecology, Evolution, Behavior and Systematics Insect Science Agronomy and Crop Science

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Resistance to a new biotype of the lettuce aphid Nasonovia ribisnigri in Lactuca virosa accession IVT280

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