Meiosis
Mitotic behavior in root tips of Brachiaria genotypes with meiotic chromosome elimination during microsporogenesis
Authors: M.F. Felismino, N. Silva, M.S. Pagliarini and C.B. Valle
Three accessions of Brachiaria brizantha, three of B. humidicola, and two interspecific hybrids between B. ruziziensis and B. brizantha were analyzed with regard to their mitotic behavior in root tips. All these genotypes revealed chromosome elimination or lack of chromosome affinity in previous analyses of microsporogenesis. .. Read More»
- Genet. Mol. Res. 7(2):
- vol7-2gmr437
- DOI:
- 10.4238/vol7-2gmr437
Cytogenetic analysis in the spermatogenesis of Triatoma melanosoma (Reduviidae; Heteroptera)
Authors: V.B. Bardella, M.T.V. Azeredo-Oliveira and E. Tartarotti
Triatomines are of great concern in public health because they are vectors of Chagas’ disease. This study presents an analysis of the species Triatoma melanosoma. The cytogenetic characteristics of triatomines include holocentric chromosomes, post-reductional meiosis in the sex chromosomes and nucleolar fragmentation in .. Read More»
- Genet. Mol. Res. 7(2):
- vol7-2gmr411
- DOI:
- 10.4238/vol7-2gmr411
Cytomixis and meiotic abnormalities during microsporogenesis are responsible for male sterility and chromosome variations in Houttuynia cordata
Authors: J.-Z. Guan, J.-J. Wang, Z.-H. Cheng, Y. Liu and Z.-Y. Li
Houttuynia cordata (Saururaceae) is a leaf vegetable and a medicinal herb througout much of Asia. Cytomixis and meiotic abnormalities during microsporogenesis were found in two populations of H. cordata with different ploidy levels (2n = 38, 96). Cytomixis occurred in pollen mother cells during meiosis at high frequencies and .. Read More»
- Genet. Mol. Res. 11(1):
- http://dx.doi.org/2012.January.17.2
- DOI:
- http://dx.doi.org/10.4238/2012.January.17.2
Abnormal male meiosis explains pollen sterility in the polyploid medicinal plant Pinellia ternata (Araceae)
Authors: Y. Liu, R.-K. Hui, R.-N. Deng, J.-J. Wang, M. Wang and Z.-Y. Li
Pinellia ternata is an important traditional Chinese medicinal plant. Its different populations in China have various ploidy levels, based on x = 13, as well as extensive aneuploid series. The microsporogenesis process was observed in specimens from three populations from three regions of Hubei Province; they were characterize.. Read More»
- Genet. Mol. Res. 11(1):
- http://dx.doi.org/2012.January.17.1
- DOI:
- http://dx.doi.org/10.4238/2012.January.17.1
Mitotic and meiotic behavior of rye chromosomes in wheat - Psathyrostachys huashanica amphiploid x triticale progeny
Authors: Q. Xie, H. Kang, D.L. Sparkes, S. Tao, X.M. Fan, L. Xu, X. Fan, L. Sha, H. Zhang, Y. Wang, J. Zeng and Y. Zhou
The dynamics of rye chromosomes during mitosis and meiosis was analyzed in a subset comprising 33 F3 lines from the cross of wheat, Psathyrostachys huashanica amphiploid (AABBDDNsNs) and hexaploid triticale (AABBRR), as visualized by genomic in situ hybridization. The results indicated that 31 of the total lines contained 4-14 rye chromosomes. Twenty-eigh.. Read More»
- Genet. Mol. Res. 12(3):
- 2013.January.4.16
- DOI:
- 10.4238/2013.January.4.16
Nucleolar-persistence phenomenon during spermatogenesis in genus Meccus (Hemiptera, Triatominae)
Authors: F.F. Madeira, A.A.C. Lima, J.A. Rosa, M.T.V. Azeredo-Oliveira and K.C.C. Alevi
The Triatominae subfamily consists of 150 species in 18 genera, grouped into six tribes. In cytogenetics, triatomines are important biological models because they have holocentric chromosomes and nucleolar persistence in meiosis. The phenomenon of nucleolar persistence has been described for 23 species of triatomine in three g.. Read More»
- Genet. Mol. Res. 15(1):
- gmr.15017427
- DOI:
- 10.4238/gmr.15017427
Study of nucleolar behavior during spermatogenesis in Martarega brasiliensis (Heteroptera, Notonectidae)
Authors: L.L.V. Pereira, K.C.C. Alevi, F.F.F. Moreira, J.F. Barbosa, E.R. Silistino-Souza, F.C. Silva J�ºnior, T.S. Souza-Firmino, C.A. Banho and M.M. Itoyama
Few cytogenetic studies have been undertaken using aquatic heteropterans and the nucleolar behavior of these insects has been described in only four species, Limnogonus aduncus, Brachymetra albinerva, Halobatopsis platensis, and Cylindrostethus palmaris. The nucleolus is a cellular structure related to biosyntheticactivity and it exhibits a peculiar behav.. Read More»
- Genet. Mol. Res. 14(3):
- 2015.August.7.7
- DOI:
- 10.4238/2015.August.7.7
Implications of mitotic and meiotic irregularities in common beans (Phaseolus vulgaris L.)
Authors: D.C. Lima, G.T. Braz, G.B. dos Reis, V.H. Techio, L.C. Davide and A. de F.B. Abreu
The common bean has great social and economic importance in Brazil and is the subject of a high number of publications, especially in the fields of genetics and breeding. Breeding programs aim to increase grain yield; however, mitosis and meiosis represent under explored research areas that have a direct impact on grain yield... Read More»
- Genet. Mol. Res. 15(2):
- gmr.15027749
- DOI:
- 10.4238/gmr.15027749
Meiotic behavior in nonaploid accessions of Brachiaria humidicola (Poaceae) and implications for breeding
Authors: K.R. Boldrini, E.V. Adamowski, N. Silva, M.S. Pagliarini and C.B. Valle
Brachiaria humidicola is a grass adapted to seasonally swampy grasslands in Africa; two cultivars, ‘common’ and Llanero, are widely used in Brazilian pastures. New cultivars are in great demand in order to diversify current production systems to achieve improved quality and yield. Cytological analyses of 55 accessi.. Read More»
- Genet. Mol. Res. 10(1):
- vol10-1gmr990
- DOI:
- 10.4238/vol10-1gmr990
Chromosome stickiness impairs meiosis and influences reproductive success in Panicum maximum (Poaceae) hybrid plants
Authors: C. Pessim,M.S. Pagliarini,N. Silva and L. Jank
Chromosome stickiness has been studied in several species of higher plants and is characterized by sticky clumps of chromatin resulting in sterility. Chromosome stickiness was recorded in Panicum maximum hybrid plants that were cultivated in the field. In the meiocytes affected, chromosomes clumped into amorphous masses that did not orient themselves on t.. Read More»
- Genet. Mol. Res. 14(2):
- http://dx.doi.org/2015.April.28.2
- DOI:
- http://dx.doi.org/10.4238/2015.April.28.2