Research Article

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04/28/2015
Breeding; Chromosome stickiness; Guineagrass; Hybrid; Meiosis; Poaceae

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 the equatorial plate, and ... more

C. Pessim; M.S. Pagliarini; N. Silva; L. Jank
05/21/2013
Consensus map; Humid; QTL; Quality; Rain-fed agriculture; Wheat

Humid rain-fed agriculture is a special environment for wheat (Triticum aestivum) culture that tends to negatively affect wheat yield and quality. To identify quality characters of wheat in a humid environment, we conducted quality analysis and quantitative trait loci (QTL) detection in a recombinant inbred line whose parent had a high level of quality for several years. We found ... more

H.M. Li; Z.X. Tang; H.Q. Zhang; B.J. Yan; Z.L. Ren
08/16/2012
Amino acid indexes; Grain softness protein; Rye; Triticale; Wheat

Grain softness protein (GSP) is an important protein for overcoming milling and grain defenses in the innate immunity systems of cereals. The objective of this study was to evaluate and understand GSP sequences in selected wheat, rye and triticale. Using sequences for this gene from a sequence database, we performed clustering analysis to compare the sequences obtained from 3 germplasms ... more

M.A.S. Kharrazi; V. Bobojonov
05/11/2007
Apoptosis; Brachiaria hybrid; Chromatin fragmentation; Male sterility; Meiosis; Programmed cell death

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 microsporogenesis. The present study reports a typical ... more

V.A. Fuzinatto; M.S. Pagliarini; C.B. Valle
12/01/2009
Basic chromosome number; Brachiaria humidicola; Forage grass; Genome affinity; Meiosis

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. Multivalent chromosome association at diakinesis ... more

K.R. Boldrini; M.S. Pagliarini; C.B. Valle
10/06/2009
Chromosome painting; Germ line limited chromosomes; Heterochromatin; Meiosis; Prophase I; Spermatogenesis

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 somatic chromosomes (Ss), develops into the primary ... more

W. Staiber
07/14/2009
Aquatic Heteroptera; Gerridae; Meiosis; Notonectidae; Nucleolar behavior; Veliidae
M.M.U. Castanhole
02/01/2011
Brachiaria; Breeding; Forage grass; Hybridization; Meiosis

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 accessions of this species available from the Embrapa Beef Cattle ... more

K.R. Boldrini; E.V. Adamowski; N. Silva; M.S. Pagliarini; C.B. Valle
10/19/2010
Breeding; Hybrids; Meiosis; Silage corn

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 to specific region. We evaluated the meiotic stability of five ... more

V.F. Souza; M.S. Pagliarini; C.A. Scapim; M. Rodovalho; M.V. Faria
08/24/2010
B microchromosome; Heterochromatin; Loricariinae; Meiosis; Rineloricaria pentamaculata; Univalent

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 acrocentric type, which were observed in 92.3% of the specimens (N = 12). These ... more

F.E. Porto; A.L.B. Portela-Castro; I.C. Martins-Santos

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