Differences in insect resistance between tomato species endemic to the Galapagos Islands

BMC Evolutionary Biology

Ben Vosman³  Richard GF Visser³  Ric CH de Vos¹  Adriaan W van Heusden³  Alejandro F Lucatti² 

[1] Netherlands Metabolomics Centre, Einsteinweg 55, 2333 CC, Leiden, The Netherlands;Graduate School Experimental Plant Sciences. Wageningen Campus. Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands;Wageningen UR Plant Breeding, Wageningen University and Research, Centre, P.O. Box 386, Wageningen, AJ 6700, The Netherlands

关键词: Selection pressure;    Acyl sugars;    Trichomes;    Whitefly;    Solanum cheesmaniae;    Solanum galapagense;    Bemisia tabaci;   

Others  :  1086558
DOI  :  10.1186/1471-2148-13-175

 received in 2013-04-04, accepted in 2013-08-21,  发布年份 2013

【 摘 要 】

Background

The Galapagos Islands constitute a highly diverse ecosystem and a unique source of variation in the form of endemic species. There are two endemic tomato species, Solanum galapagense and S. cheesmaniae and two introduced tomato species, S. pimpinellifolium and S. lycopersicum. Morphologically the two endemic tomato species of the Galapagos Islands are clearly distinct, but molecular marker analysis showed no clear separation. Tomatoes on the Galapagos are affected by both native and exotic herbivores. Bemisia tabaci is an important introduced insect species that feeds on a wide range of plants. In this article, we address the question whether the differentiation between S. galapagense and S. cheesmaniae may be related to differences in susceptibility towards phloem-feeders and used B. tabaci as a model to evaluate this.

Results

We have characterized 12 accessions of S. galapagense, 22 of S. cheesmaniae, and one of S. lycopersicum as reference for whitefly resistance using no-choice experiments. Whitefly resistance was found in S. galapagense only and was associated with the presence of relatively high levels of acyl sugars and the presence of glandular trichomes of type I and IV. Genetic fingerprinting using 3316 SNP markers did not show a clear differentiation between the two endemic species. Acyl sugar accumulation as well as the climatic and geographical conditions at the collection sites of the accessions did not follow the morphological species boundaries.

Conclusion

Our results suggest that S. galapagense and S. cheesmaniae might be morphotypes rather than two species and that their co-existence is likely the result of selective pressure.

【 授权许可】

   
2013 Lucatti et al.; licensee BioMed Central Ltd.

【 图 表 】

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