Bibliografia

Redalyc
Scientific Information System
Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal

Bigliardo, Graciela R. de; Virla, Eduardo Gabriel; Caro, Sara; Murillo Dasso, Santiago Karyotype and male pre-reductional meiosis of the sharpshooter Tapajosa rubromarginata (Hemiptera: Cicadellidae) Revista de Biología Tropical, vol. 59, núm. 1, marzo, 2011, pp. 309-314Universidad de Costa Rica San Pedro de Montes de Oca, Costa Rica
Available in: http://www.redalyc.org/src/inicio/ArtPdfRed.jsp?iCve=44918841027

Revista de Biología Tropical ISSN (Printed Version): 0034-7744 rbt@cariari.ucr.ac.cr Universidad de Costa Rica Costa Rica

How to cite

Complete issue

More information about this article

Journal's homepage

www.redalyc.org Non-ProfitAcademic Project, developed under the Open Acces Initiative

s z

s

z

s

z Karyotype and male pre-reductional meiosis of the sharpshooter Tapajosa rubromarginata (Hemiptera: Cicadellidae)
Graciela R. de Bigliardo1,2, Eduardo Gabriel Virla3, Sara Caro1 & Santiago Murillo Dasso1
1. 2. 3. Facultad de Ciencias Naturales e IML. U.N.T. Miguel Lillo 205. San Miguel de Tucumán (4000), Tucumán,Argentina; grabigliardo@hotmail.com Fundación Miguel Lillo. Miguel Lillo 251. San Miguel de Tucumán (4000), Tucumán, Argentina; fmlbot@tucbbs.com.ar PROIMI-Biotechnology, Biocontrol Div. Av. Belgrano & Pje. Caseros. San Miguel de Tucumán (4000), Tucumán, Argentina; evirla@hotmail.com Received 12-IV-2010. Corrected 17-Ix-2010. Accepted 19-x-2010.

Abstract: Cicadellidae in one of the bestrepresented families in the Neotropical Region, and the tribe Proconiini comprises most of the xylem-feeding insects, including the majority of the known vectors of xylem-born phytopathogenic organisms. The cytogenetics of the Proconiini remains largely unexplored. We studied males of Tapajosa rubromarginata (Signoret) collected at El Manantial (Tucumán, Argentina) on native spontaneous vegetation whereSorghum halepense predominates. Conventional cytogenetic techniques were used in order to describe the karyotype and male meiosis of this sharpshooter. T. rubromarginata has a male karyological formula of 2n=21 and a sex chromosome system xO:xx ( : ). The chromosomes do not have a primary constriction, being holokinetic and the meiosis is pre-reductional, showing similar behavior both for autosomesand sex chromosomes during anaphase I. For this stage, chromosomes are parallel to the acromatic spindle with kinetic activities in the telomeres. They segregate reductionally in the anaphase I, and towards the equator during the second division of the meiosis. This is the first contribution to cytogenetic aspects on proconines sharpshooters, particularly on this economic relevant Auchenorrhynchaspecies. Rev. Biol. Trop. 59 (1): 309314. Epub 2011 March 01. Key words: Insecta, Cicadellidae, Proconiini, karyotype, holokinetic chromosomes, sex chromosomes.

Cicadellidae (Hemiptera: Auchenorhyncha) is a large family that includes approximately 22 000 species, which is well represented in the Neotropical region (McKamey 2002). Due to their feeding habits and well-known capacity to transmitplant pathogens, some species represent significant pests for many economically important crops (Freytag & Sharkey 2002). The tribe Proconiini (Cicadellinae) is composed of 59 genera and over 400 species, all confined to the Americas (Young 1968, Rakitov & Dietrich 2001), even though Homalodisca vitripennis (Germar) has recently invaded Pacific Islands (Grandgirard et al.

2008). The Proconiini(sharpshooters) is one of the largest groups of xylem-feeding insects and includes the majority of the known vectors of xylem-born phytopathogenic organisms (Rakitov & Dietrich 2001, Redak et al. 2004). Tapajosa rubromarginata Signoret is distributed in tropical and subtropical areas of Brazil and Argentina (Paradell 1995, de Azevedo-Filho & Carvallo 2004, Takiya & Dimitriev 2008). It has been...