Cicero, J. M., & Brown, J. K. (2012). Ultrastructural studies of the salivary duct system in the whitefly vector bemisia tabaci (Aleyrodidae: Hemiptera). Annals of the Entomological Society of America, 105(5), 701-717.
Abstract:
Bemisia tabaci (Gennadius) transmits plant viruses of the genus Begomovirus in a circulative manner, and once acquired, virus particles persist and are transmissible for the life of the vector. Saliva is generated by primary and accessory salivary gland cells of the paired, bilaterally symmetrical salivary gland system. It travels from secretory cells, through the internal ductules, to the external ducts, which in turn carry it to the oral region where the so-called salivary pump and the stylets occur. The ducts of either side consist of at least four componentstwo gland ducts, one lateral duct, and one postmedial duct. Gland ducts start, respectively, at the hilum of each gland, and extend independently of each other before fusing together by their basal laminae to become the biluminal lateral duct. The biluminal lateral duct merges into the uniluminal postmedial duct. The lateral and postmedial ducts make intimate contact with muscles in its area, including one involved in governing the retractable labial shaft. The labium consists of external and internal halves. During retraction/protraction, the latter half moves through the second intercommissural space. The postmedial ducts track anteriorly around either side of it, and fuse together at the body's midline to form the biluminal medial duct. This duct drains into the salivary pump. The retortiform organs are involved in stylet regeneration. Maxillary stylets have grooves and ridges that interlock to form the salivary and food canals. In developmental terms, the salivary canal results from failure of one ridge to fill its corresponding groove. © 2012 Entomological Society of America.
Brown, J. K. (2015). First report of Chickpea chlorotic dwarf virus infecting tomato in Pakistan (Short report).. Plant Dis., 99:, 1287.
Zia-Ur-Rehman, M., Hameed, U., Herrmann, H-W, Iqbal, M.J., Haider, M.S., and Brown, J.K. 2015. First report of Chickpea chlorotic dwarf virus infecting tomato in Pakistan. Plant Dis. 99:1287. http://dx.doi.org/10.1094/PDIS-02-15-0202-PDN
Leke, W., Sattar, M., Ngane, E., Negeve, J., Kvarnheden, A., & Brown, J. (2013). Diverse group of helper begomoviruses and satellite DNAs infecting okra in Cameroon. Virus Res.
Zia-Ur-Rehman, M., Herrmann, H. -., Hameed, U., Haider, M. S., & Brown, J. K. (2013). First detection of cotton leaf curl Burewala virus and cognate cotton leaf curl Multan betasatellite and Gossypium darwinii symptomless alphasatellite in symptomatic luffa cylindrica in Pakistan. Plant Disease, 97(8), 1122-.
Qiu, B., Coats, S. A., Ren, S., Idris, A. M., Caixia, X. u., & Brown, J. K. (2007). Phylogenetic relationships of native and introduced Bemisia tabaci (Homoptera: Aleyrodidae) from China and India based on mtCOI DNA sequencing and host plant comparisons. Progress in Natural Science, 17(6), 645-654.
Abstract:
Phylogenetic relationships for Bemisia tabaci were reconstructed by analysis of a -780 bp fragment of the mitochondrial cytochrome oxidase I (mtCOI) gene with an emphasis on geographic range and distribution among eight eudicot plant families that are common hosts of B. tabaci worldwide to elucidate key phylogeographic linkages between populations extant in China (n=31) and India (n=34). Bootstrap values for the Maximum Parsimony tree were highly robust for all major nodes involving the major Asian clade, subgroups, and sister groups within, at 92%-100%. Between-clade distances for the Southeast Asia and three other major clades, e.g. from sub-Sahara Africa, North Africa-Mediterranean, and the Americas, were approximately >16% divergent. Two major Asian subgroups (I, II) were resolved, which represented populations indigenous to the region, comprising two (Ia, Ib) and five (II a-e) sister groups, respectively, which diverged by 11%. Two distinct populations from sunflower in Hyderabad grouped separately within the two Asian subgroups. All other populations grouped uniquely within Asian subgroup II or I. The B biotype was identified in 23 collections from China at 97.3%-99.5% nucleotide identity with B biotype reference sequences; it was not identified in collections from India. The majority of haplotypes were associated with 3-4 plant families, with one exception that for sister group IId (sesame, India), it might be monophagous. Thus, B. tabaci from the southeastern and near eastern regions of the Asian continent comprise of a large number of ancestral, richly divergent, mostly polyphagous populations. This region is therefore hypothesized to constitute an important Old World center of diversification for the B. tabaci complex, together with sub-Saharan Africa.
