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Meiosis

Plant Genetics   Review Article

Contributions of classical and molecular cytogenetic in meiotic analysis and pollen viability for plant breeding

Authors: M.P. Lavinscky, M.M. Souza, G.S. Silva and C.A.F. Melo

The analysis of meiotic behavior has been widely used in the study of plants as they provide relevant information about the viability of a species. Meiosis boasts a host of highly conserved events and changes in genes that control these events will give rise to irregularities that can alter the normal course of meiosis and may.. Read More»

Genet. Mol. Res. 16(3):
gmr16039582
DOI:
10.4238/gmr16039582
Microbial Genetics   Research Article

Microsporogenesis in Paspalum conspersum Schrad. (Virgata group) with different ploidy levels

Authors: L. Janke1, F.H.D. Souza2, J.F.M. Valls3 and M.S. Pagliarini1

Knowledge about the cytology and reproductive behavior of a species is indispensable for hybridization programs. This is especially true for species belonging to the genus Paspalum, among which apomixis and a wide range of ploidy levels are frequently found. Paspalum conspersum Schrad. is a robust and warm-season perennial bunchgrass native to South Ameri.. Read More»

Genet. Mol. Res. 12(4):
2013.October.24.6
DOI:
10.4238/2013.October.24.6
Human Genetics   Research Article

Spermatogenesis in Triatoma melanocephala (Hemiptera: Triatominae)

Authors: K.C.C. Alevi1, P.P. Mendon�§a1, N.P. Pereira1, J.A. Rosa2 and M.T.V. Azeredo-Oliveira1

Triatoma melanocephala is a rare species of Hemiptera. It belonged to the Brasiliensis subcomplex and presents morphological characteristics very close to those of Triatoma vitticeps. We investigated spermatogenesis of T. melanocephala and compared it with that of T. vitticeps in order to determine whether these organisms have similar cytogenetic characte.. Read More»

Genet. Mol. Res. 12(4):
2013.October.24.5
DOI:
10.4238/2013.October.24.5
Human Genetics   Research Article

Cytogenetic studies on meiotic chromosome behaviors in sterile Oriental x Trumpet lily

Authors: J.R. Luo, J.M. Van Tuyl, P. Arens and L.X. Niu

In order to determine the reasons for pollen sterility in lily hybrids, four diploid sterile Oriental x Trumpet (OT) lily cultivars (‘Nymph’, ‘Gluhwein’, ‘Yelloween’, and ‘Shocking’) were used to investigate the meiotic chromosome behaviors in pollen mother cells (PMCs), using genomic in situ hybridization a.. Read More»

Genet. Mol. Res. 12(4):
2013.December.13.1
DOI:
10.4238/2013.December.13.1
Animal Genetics   Research Article

Spermatogenesis of riffle bugs, Rhagovelia whitei and Rhagovelia sp (Veliidae), and backswimmers Martarega sp (Notonectidae)

Authors: M.M.U. Castanhole, L.L.V. Pereira, H.V. de Souza and M.M. Itoyama

We examined the course of spermatogenesis and the meiotic chromosome complements in aquatic species of true bugs, Heteroptera. The chromosome complement of the Veliidae species was 2n = 39 (38A + X0) and 23 (22A + X0) in Rhagovelia whitei and Rhagovelia sp, respectively, and in the species of the Notonectidae (Martarega sp) it.. Read More»

Genet. Mol. Res. 11(3):
2012.August.6.5
DOI:
10.4238/2012.August.6.5
Human Genetics   Research Article

Spermatogenesis and nucleolar behavior in males of aquatic Heteroptera

Authors: M.M.U. Castanhole

Aspects of spermatogenesis and nucleolar behavior were analyzed in Brachymetra albinerva, Cylindrostethus palmaris, Halobatopsis platensis, Limnogonus aduncus (Gerridae), Martarega sp (Notonectidae), Rhagovelia whitei, and Rhagovelia sp (Veliidae). The testicles are rounded (Veliidae), elongated (Gerridae) or spiral (Notonectidae) and have a transparent m.. Read More»

Genet. Mol. Res. 8(3):
vol8-3ta019
DOI:
10.4238/vol8-3ta019
Human Genetics   Research Article

FISH analysis and cytogenetic characterization of male meiotic prophase I in Acricotopus lucidus (Diptera, Chironomidae)

Authors: W. Staiber

In the chironomid Acricotopus lucidus, two cells with quite different chromosome complements arise from the last unequal spermatogonial mitosis, as a consequence of monopolar migration of the so-called germ line limited chromosomes (Ks). The cell receiving all the Ks, in addition to two sets of the regularly segregating somati.. Read More»

Genet. Mol. Res. 8(4):
vol8-4gmr664
DOI:
10.4238/vol8-4gmr664
Microbial Genetics   Research Article

Meiotic behavior of a nonaploid accession endorses x = 6 for Brachiaria humidicola (Poaceae)

Authors: K.R. Boldrini, M.S. Pagliarini and C.B. Valle

Brachiaria humidicola (Poaceae), originally from Africa, is an economically important pasture plant in tropical South America. An accession of B. humidicola (H038) collected from the wild African savanna (Mbeya, Tanzania) showed irregular microsporogenesis. This meiotic behavior was consistent with an allopolyploid origin. Mul.. Read More»

Genet. Mol. Res. 8(4):
vol8-4gmr679
DOI:
10.4238/vol8-4gmr679
Plant Genetics   Research Article

Complete asynapsis resulting in 2n pollen formation in Paspalum jesuiticum Parodi (Poaceae)

Authors: R.A. Bernardo Filho, A.C.C. Santos, F.H.D. Souza, J.F.M. Valls and M.S. Pagliarini

Cytological investigation revealed complete asynapsis during microsporogenesis in 2 wild accessions of Paspalum jesuiticum collected in distinct Brazilian regions. Both accessions were hexaploid (2n = 6x = 60) and 60 univalents could be counted at diakinesis. In this phase, the majority of meiocytes exhibited univalents with b.. Read More»

Genet. Mol. Res. 13(1):
2014.January.17.9
DOI:
10.4238/2014.January.17.9
Plant Genetics   Research Article

Microsporogenesis analysis validates the use of artificially tetraploidized Brachiaria ruziziensis in breeding programs

Authors: C.M.P. Paula, K.G. Figueiredo, F. Souza Sobrinho, F.R.G. Benites, L.C. Davide1and V.H. Techio

The genus Brachiaria contains species that have great economic importance in the Brazilian agricultural sector, as they enable cattle ranching on acid and poor soils with species that are resistant to spittlebugs and form crop-livestock-forest integration systems. The genus mainly consists of tetraploid (2n = 4x = 36) and apomictic species such as B. decu.. Read More»

Genet. Mol. Res. 15(3):
gmr.15038737
DOI:
10.4238/gmr.15038737