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1 January 2003 Mitochondrial DNA Evidence for a Distinct New World Group of Bemisia tabaci (Gennadius) (Hemiptera:Aleyrodidae) Indigenous to Argentina and Bolivia, and Presence of the Old World B Biotype in Argentina
M. M. Viscarret, I. Torres-Jerez, E. Agostini de Manero, S. N. López, E. E. Botto, J. K. Brown
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Abstract

A study was undertaken to establish the diversity within the Bemisia tabaci (Gennadius) species complex in Argentina using the mitochondria cytochrome oxidase I gene (mt COI) as a molecular marker. For one haplotype, common to cotton in the Santiago Province, biotic characters were evaluated, and included host range and life history traits: fecundity, generation time, intrinsic rate of increase, longevity, and rate of reproduction. To investigate genetic diversity, B. tabaci were collected from representative geographical locations and host plants in six provinces of Argentina. Also, B. tabaci found colonizing tomato plants in nearby Bolivia, which exhibited viruslike symptoms, were included in the study. We report, for the first time, the presence of the introduced ‘B’ biotype in Argentina, and present evidence for indigenous or ‘local’ B. tabaci haplotypes in both Argentina (ARG) and Bolivia (BOL), which collectively formed a distinctive, South American phylogeographic grouping of New World B. tabaci. Two closely related ARG haplotypes, ARG2/3 from Salta and Tucamán, and ARG1 from Santiago, shared 98.7% identity, whereas the Bolivian haplotype (BOL), their closet relative, shared 99.4% and 99.9% identity with ARG1 and ARG2/3, respectively. Mt COI sequences for collections identified as the ‘B’ biotype from Argentina (ARG4/5) shared 99.5–100% nt identity with the five ‘B’ biotype reference sequences and colonies established for ARG4 and ARG5 were capable of inducing silvering in Cucurbita spp., confirming their identity as the B bioytpe. The closest relatives to the ARG/BOL haplotypes were members of the North/Central American clade of B. tabaci with which they shared 4.6 to 8.6% identity, indicating that the ARG and BOL B. tabaci are of New World origin. The latter range of divergence is similar to that estimated for the Old World B biotype and its closest relatives from the Mediterranean region, at 5.4 to 6.4%. Divergence estimates for Old World X Old World and New World X Old World phylogeographical clades were 14.6 to 16.2% and 14.4 to 17.4%, respectively, indicating that haplotypes in both eastern and western hemispheres exhibit substantial diversity from one another. Despite the somewhat more moderate interclade divergence for New World compared with Old World clades, the South American B. tabaci formed a distinctive New World clade, suggesting a common ancestry with other previously studied New World taxa, from which they are separated by geographical barriers. Life history traits for the cotton-associated B. tabaci haplotype (ARG1) were most similar to those previously reported for the polyphagous A biotype, AZA, from Arizona, and differed substantially with respect to the B biotype.

M. M. Viscarret, I. Torres-Jerez, E. Agostini de Manero, S. N. López, E. E. Botto, and J. K. Brown "Mitochondrial DNA Evidence for a Distinct New World Group of Bemisia tabaci (Gennadius) (Hemiptera:Aleyrodidae) Indigenous to Argentina and Bolivia, and Presence of the Old World B Biotype in Argentina," Annals of the Entomological Society of America 96(1), 65-72, (1 January 2003). https://doi.org/10.1603/0013-8746(2003)096[0065:MDEFAD]2.0.CO;2
Received: 23 July 2001; Accepted: 1 August 2002; Published: 1 January 2003
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KEYWORDS
Bemisia tabaci complex
haplotype
mitochondria COI gene
phylogenetic analysis
whitefly biology
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