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Title: Cytogenetic and molecular evidence for an additional new species within the taxon Anopheles barbirostris (Diptera: Culicidae) in Thailand
Authors: Sittiporn Suwannamit
Visut Baimai
Yasushi Otsuka
Atiporn Saeung
Sorawat Thongsahuan
Benjawan Tuetun
Chamnarn Apiwathnasorn
Narissara Jariyapan
Pradya Somboon
Hiroyuki Takaoka
Wej Choochote
Keywords: Agricultural and Biological Sciences
Immunology and Microbiology
Issue Date: 1-Mar-2009
Abstract: ITS2 DNA sequences of 42 isoline colonies of Anopheles barbirostris species A1 and A2 were analyzed and a new genetic species, temporarily designated as species A4 (Chiang Mai), was revealed. The large sequence divergences of the ITS2 (0.116-0.615), COI (0.023-0.048), and COII (0.030-0.040) genes between A. barbirostris species A4/A1 (Chiang Mai), A4/A2 (Phetchaburi), A4/A3 (Kanchanaburi), and A4/Anopheles campestris-like Form E (Chiang Mai) provided good supporting evidence. Species A1, A2, A3, and A4 share a mitotic karyotype of Form A (X1, X2, Y1). Crossing experiments between species A4 and the other four species yielded strong reproductive isolation producing few and/or non-hatched eggs and inviable and/or abnormal development of the reproductive system of F1progenies. Moreover, available F1hybrid larvae showed asynaptic polytene chromosome arms. Hence, molecular and cytogenetic evidence strongly support the existence of A. barbirostris species A4, which is more closely related to A. campestris-like Form E than to species A1, A2, and A3. Additionally, crossing experiments among 12 and seven isolines of different cytological forms of species A1 (A, B, C, D) and A2 (A, B), respectively, yielded fertile and viable F1progenies. Thus, different karyotypic forms occurring in natural populations of species A1 and A2 merely represent intraspecies variation of sex chromosomes due to the extra blocks of heterochromatin. © 2008 Springer-Verlag.
ISSN: 09320113
Appears in Collections:CMUL: Journal Articles

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