Meiosis
Distribution of constitutive heterochromatin in Pachycoris torridus (Hemiptera, Scutelleridae) with different chromatic patterns
Authors: T.S. Souza-Firmino, K.C.C. Alevi, L.L.V. Pereira, E.R.S. Souza, F.C.S. J�ºnior,C.A. Banho, G.O. Carmo, M.M. Itoyama
The stink bug Pachycoris torridus is a pest of great agricultural importance due to its records on culture of physic nut (Jatropha curcas), which is the raw material for biodiesel production. An interesting feature of this insect is its high phenotypic variability, a characteristic that resulted in it being classified as a new.. Read More»
- Genet. Mol. Res. 14(4):
- 2015.December.1.26
- DOI:
- 10.4238/2015.December.1.26
Chromosome number, microsporogenesis, microgametogenesis, and pollen viability in the Brazilian native grass Mesosetum chaseae (Poaceae)
Authors: L.A.C. Silva M.S. Pagliarini S.A. Santos N. Silva V.F. Souza
The genus Mesosetum is a primarily South American genus with 42 species. Mesosetum chaseae, regionally known as âÂ?Â?grama-do-cerradoâÂ?Â?, is abundant in the Pantanal Matogrossense (Brazil); it is a valuable resource for livestock and for environmental conservation. We collected specimens from the Nhecolandia sub-region of the Brazilian Pantanal, located .. Read More»
- Genet. Mol. Res. 11(4):
- 2012.September.12.1
- DOI:
- 10.4238/2012.September.12.1
Effect of forest fragmentation on microsporogenesis and pollen viability in Eugenia uniflora, a tree native to the Atlantic Forest
Authors: Effect of forest fragmentation on microsporogenesis and pollen viability in Eugenia uniflora, a tree native to the Atlantic Forest
Habitat fragmentation, caused by the expansion of agriculture in natural areas, may be one of the strongest impacts humans have on the ecosystem. These changes can decrease the number of individuals in a population, leading to endogamy. In allogamous species, endogamy can have a negative effect on reproductive capacity. In this study, we analyzed the effe.. Read More»
- Genet. Mol. Res. 11(4):
- 2012.September.20.2
- DOI:
- 10.4238/2012.September.20.2
Karyotype and spermatogenesis in Triatoma lenti (Hemiptera: Triatominae), a potential Chagas vector
Authors: K.C.C. Alevi P.P. Mendon�§a M. Succi N.P. Pereira J.A. Rosa M.T.V. Azeredo-Oliveira
All species of Triatominae are susceptible to infection by Trypanosoma cruzi (Kinetoplastida: Trypanosomatidae) and consequently, potential insect vectors of Chagas disease. Currently, there are 140 known species of triatomine bugs, which can be grouped into specific species complexes. The species Triatoma lenti (Hemiptera: Triatominae) is found only in B.. Read More»
- Genet. Mol. Res. 11(4):
- 2012.December.17.3
- DOI:
- 10.4238/2012.December.17.3
Meiotic behavior as a selection tool in silage corn breeding
Authors: V.F. Souza, M.S. Pagliarini, C.A. Scapim, M. Rodovalho and M.V. Faria
In breeding programs, commercial hybrids are frequently used as a source of inbred lines to obtain new hybrids. Considering that maize production is dependent on viable gametes, the selection of populations to obtain inbred lines with high meiotic stability could contribute to the formation of new silage corn hybrids adapted t.. Read More»
- Genet. Mol. Res. 9(4):
- vol9-4gmr924
- DOI:
- 10.4238/vol9-4gmr924
Spermatogenesis and karyotypes of three species of water striders (Gerridae, Heteroptera)
Authors: M.M.U. Castanhole, L.L.V. Pereira, H.V. Souza and M.M. Itoyama
Although they are of economic importance, there have been few cytogenetic studies of the Gerridae (Heteroptera) in Brazil. We examined spermatogenesis (meiosis and spermiogenesis) and nucleolar behavior in three species of the family Gerridae. Brachymetra albinerva and Halobatopsis platensis were found to have a chromosome com.. Read More»
- Genet. Mol. Res. 9(3):
- vol9-3gmr841
- DOI:
- 10.4238/vol9-3gmr841
Possible origins of B chromosomes in Rineloricaria pentamaculata (Loricariidae, Siluriformes) from the Paran�¡ River basin
Authors: F.E. Porto, A.L.B. Portela-Castro and I.C. Martins-Santos
We made a cytogenetic study of Rineloricaria pentamaculata from the Tauá Stream, in the Pirapó River sub-basin in Paraná State, Brazil, focused on the occurrence and origins of the B chromosomes. The diploid number varied from 2n = 56 to 2n = 59, due to the presence of 0 to 3 B microchromosomes of the acro.. Read More»
- Genet. Mol. Res. 9(3):
- vol9-3gmr859
- DOI:
- 10.4238/vol9-3gmr859
Evidence of programmed cell death during microsporogenesis in an interspecific Brachiaria (Poaceae: Panicoideae: Paniceae) hybrid
Authors: Fuzinatto VA, Pagliarini MS and Valle CB
Morphological changes have been investigated during plant programmed cell death (PCD) in the last few years due to the new interest in a possible apoptotic-like phenomenon existing in plants. Although PCD has been reported in several tissues and specialized cells in plants, there have been few reports of its occurrence during .. Read More»
- Genet. Mol. Res. 6(2):
Meiotic behavior and karyotypic variation in Acledra (Pentatomidae, Heteroptera)
Authors: P.J. Rebagliati and L.M. Mola
Acledra comprises 15 taxonomically identified species, most of which are crop pests. This is the first cytogenetic study of species of this genus. Acledra kinbergii and A. modesta showed the modal number of the Pentatomidae (2n = 14 = 12 + XY), while A. bonariensis had a reduced complement (2n = 12 = 10 + XY), with a markedly .. Read More»
- Genet. Mol. Res. 9(2):
- vol9-2gmr763
- DOI:
- 10.4238/vol9-2gmr763
Meiotic behavior and pollen viability in Moringa oleifera (Moringaceae) cultivated in southern Brazil
Authors: N. Silva, A.B. Mendes-Bonato, J.G.C. Sales and M.S. Pagliarini
Although originally from India, Moringa oleifera is now cultivated throughout most of the tropics, including Brazil. Despite its multipurpose value for food and traditional medicine, little is known about the meiotic behavior and pollen viability of M. oleifera. We evaluated microsporogenesis and pollen viability in eleven pla.. Read More»
- Genet. Mol. Res. 10(3):
- vol10-3gmr1490
- DOI:
- 10.4238/vol10-3gmr1490