C-banding

Characterization of a new wheat-Aegilops biuncialis addition line conferring quality-associated HMW glutenin subunits

J. P. Zhou, Yao, C. H., Yang, E. N., Yin, M. Q., Liu, C., and Ren, Z. L., Characterization of a new wheat-Aegilops biuncialis addition line conferring quality-associated HMW glutenin subunits, vol. 13, pp. 660-669, 2014.

In this study, a new disomic addition line, 12-5-2, with 44 chromosomes that was derived from BC3F2 descendants of the hybridization between Triticum aestivum cv. CN19 and Aegilops biuncialis was created and reported. 12-5-2 was immune to both powdery mildew and stripe rust and has stable fertility. Fluorescence in situ hybridization and C-banding revealed that 12-5-2 was a 1Ub disomic addition line (ADL1Ub).

Karyotypic diversity in a population of Bryconamericus aff. iheringii (Characidae)

L. L. L. da Silva, Giuliano-Caetano, L., and Dias, A. L., Karyotypic diversity in a population of Bryconamericus aff. iheringii (Characidae), vol. 13, pp. 2069-2081, 2014.

Bryconamericus comprises 56 species distributed into three groups, on the basis of the position and shape of the maxillary teeth: B. exodon, B. microcephalus and B. iheringii groups. Few cytogenetic data are available for this genus, but the diploid number of 52 chromosomes is quite common, although the karyotypic variability is extensive. This study aimed to characterize a population of B. aff. iheringii and thus contribute more cytogenetic information and better understanding of the structure and karyotypic evolution of this genus.

Dynamics of chromosomal evolution in the genus Hypsiboas (Anura: Hylidae)

M. A. Carvalho, Rodrigues, M. T., Siqueira, S., and Garcia, C., Dynamics of chromosomal evolution in the genus Hypsiboas (Anura: Hylidae), vol. 13, pp. 7826-7838, 2014.

Hylidae is one of the most species-rich families of anurans, and 40% of representatives in this group occur in Brazil. In spite of such remarkable diversity, little is known about this family and its taxonomical and systematic features. Most hylids have 2n = 24, even though most of the cytogenetic data are mainly obtained based on the conventional chromosomal staining and are available for only 16% of Hypsiboas species, a genus accounting for about 10% of the hylid diversity.

Distribution of constitutive heterochromatin in species of triatomines with fragmentation of sex chromosomes X

A. L. Guerra, Alevi, K. C. C., Rosa, J. A., and Azeredo-Oliveira, M. T. V., Distribution of constitutive heterochromatin in species of triatomines with fragmentation of sex chromosomes X, vol. 13, pp. 10279-10284, 2014.

Cytogenetic analyses of triatomines are considered to be important taxonomic tools. Thus, we analyzed the pattern of constitutive heterochromatin in 7 species of triatomine with fragmentation of the sex chromosome X, focusing on the cytotaxonomy of these triatomines. The species analyzed included Triatoma vitticeps, Triatoma melanocephala, Triatoma tibiamaculata, Triatoma protracta, Meccus pallidipennis, Panstrongylus megistus, and Panstrongylus lignarius.

Molecular cytogenetic characterization of the Aegilops biuncialis karyotype

J. Wang, Zhang, W., Zhao, H., Li, F. R., Wang, Z. G., Ji, J., Zhang, X. Q., Wang, D. W., and Li, J. M., Molecular cytogenetic characterization of the Aegilops biuncialis karyotype, vol. 12. pp. 683-692, 2013.

Aegilops biuncialis can be hybridized with wheat (Triticum spp) and has been used for wheat breeding and genetic studies. The A. biuncialis karyotype (Ub Ub Mb Mb) was investigated based on three A. biuncialis accessions grown in China. Two pairs of SAT chromosomes were identified as 1Ub and 5Ub, with a karyotype formula of 2n = 4x = 28 = 14m + 10sm + 4st. Fluorescence in situ hybridization (FISH) and C-banding approaches were used to analyze the A.

Molecular cytogenetic characterization of a new leaf rolling triticale

E. N. Yang, Yang, Z. J., Zhang, J. F., Zou, Y. C., and Ren, Z. L., Molecular cytogenetic characterization of a new leaf rolling triticale, vol. 10, pp. 2953-2961, 2011.

Leaf rolling occurs in some cereal genotypes in response to drought. We identified and made a phenotypic, cytological and physiological analysis of a leaf-rolling genotype (CMH83) of hexaploid triticale (X Triticosecale Wittmack) that exhibited reduced plant height, rolled and narrow leaves. Gliadin electrophoresis of seed protein showed that CMH83 was genetically stable. Sequential Giemsa-C-banding and genomic in situ hybridization showed that CMH83 contains 12 rye chromosomes; two pairs of these chromosomes have reduced telomeric heterochromatin bands.

Karyotypic characterization of Iheringichthys labrosus (Pisces, Pimelodidae): C-, G- and restriction endonuclease banding

R. Augusto de Carvalho and Dias, A. Lúcia, Karyotypic characterization of Iheringichthys labrosus (Pisces, Pimelodidae): C-, G- and restriction endonuclease banding, vol. 4, pp. 663-667, 2005.

Various chromosomal banding techniques were utilized on the catfish, Iheringichthys labrosus, taken from the Capivara Reservoir. C-banding regions were evidenced in telomeric regions of most of the chromosomes. The B microchromosome appeared totally heterochromatic. The restriction endonuclease AluI produced a banding pattern similar to C-banding in some chromosomes; the B microchromosome, when present, was not digested by this enzyme and remained stained. G-banding was conspicuous in almost all the chromosomes, with the centromeres showing negative G-banding.

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