Abstract
Cicadellidae in one of the best represented 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 where Sorghum 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 (male:female). The chromosomes do not have a primary constriction, being holokinetic and the meiosis is pre-reductional, showing similar behavior both for autosomes and 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 Auchenorrhyncha species.
Highlights
Cicadellidae (Hemiptera: Auchenorhyncha) is a large family that includes approximately 22 000 species, which is well represented in the Neotropical region (McKamey 2002)
T. rubromarginata show in the male a diploid number of 21, with a sex mechanism of XO
This species displays holokinetic chromosomes, which are characteristic of Auchenorrhyncha as a whole (Halkka 1959)
Summary
Cicadellidae (Hemiptera: Auchenorhyncha) is a large family that includes approximately 22 000 species, which is well represented in the Neotropical region (McKamey 2002). Cicadellidae, like other Auchenorrhyncha, have holokinetic chromosomes, showing highly variable numbers in their karyotype This type of chromosome plays an essential role in karyotype evolution, due to the high levels of fragmentation and fusions (Maryanska-Nadachowska et al 2006). Proconiini cytogenetics remains largely unexplored; in addition, this subject is totally unknown for Argentinian Auchenorrhyncha species. The aim of this contribution is to report the chromosome number in T. rubromarginata, and provide a brief description of holokinetic chromosomes behavior during male meiosis
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