title: Thermotolerance and gene expression following heat stress in the whitefly Bemisia tabaci B and Q biotypes.
abstract: The whitefly Bemisia tabaci (Gennadius) causes tremendous losses to agriculture by direct feeding on plants and by vectoring several families of plant viruses. The B. tabaci species complex comprises over 10 genetic groups (biotypes) that are well defined by DNA markers and biological characteristics. B and Q are amongst the most dominant and damaging biotypes, differing considerably in fecundity, host range, insecticide resistance, virus vectoriality, and the symbiotic bacteria they harbor. We used a spotted B. tabaci cDNA microarray to compare the expression patterns of 6000 ESTs of B and Q biotypes under standard 25 degrees C regime and heat stress at 40 degrees C. Overall, the number of genes affected by increasing temperature in the two biotypes was similar. Gene expression under 25 degrees C normal rearing temperature showed clear differences between the two biotypes: B exhibited higher expression of mitochondrial genes, and lower cytoskeleton, heat-shock and stress-related genes, compared to Q. Exposing B biotype whiteflies to heat stress was accompanied by rapid alteration of gene expression. For the first time, the results here present differences in gene expression between very closely related and sympatric B. tabaci biotypes, and suggest that these clear-cut differences are due to better adaptation of one biotype over another and might eventually lead to changes in the local and global distribution of both biotypes.
authors.affiliation: The Hebrew University of Jerusalem, The Robert H. Smith Faculty of Agriculture, Food and Environment, Institute of Plant Sciences and Genetics in Agriculture and the Minerva Otto Warburg Center for Agricultural Biotechnology, Rehovot, Israel.
authors.forename: Assaf
authors.initials: A
authors.lastname: Mahadav
authors.forename: Svetlana
authors.initials: S
authors.lastname: Kontsedalov
authors.forename: Henryk
authors.initials: H
authors.lastname: Czosnek
authors.forename: Murad
authors.initials: M
authors.lastname: Ghanim
mesh_terms: D000818:Animals; D015870:Gene Expression; D006430:Hemiptera / Q000145:classification / Q000235:genetics / Q000502:physiology*; D006358:Hot Temperature; D019476:Insect Proteins / Q000235:genetics / Q000378:metabolism; D008969:Molecular Sequence Data; D013312:Stress, Physiological
chemical_list: D019476:Insect Proteins