Chromosome number and meiotic behaviour inBrachiaria jubata (Gramineae)

Mendes-Bonato, Andréa Beatriz; Risso-Pascotto, Claudicéia; Pagliarini, Maria Suely; Valle, Cacilda Borges do

doi:10.1007/bf02728976

Cited by 40 publications

(28 citation statements)

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“…Brachiaria breeding is difficult to accomplish because of differences in chromosome numbers among accessions and lack of sexuality in the most important species. The majority of accessions are polyploid, mainly tetraploid (Mendes-Bonato et al, 2002;2006a;Utsunomiya et al, 2005;Risso-Pascotto et al, 2005;Pagliarini et al, 2008) and polyploidy in the genus is correlated with apomixis (Valle & Savidan, 1996).…”

Section: Some Considerations About the Brachiaria Genusmentioning

confidence: 99%

Meiotic Behavior in Intra- and Interspecific Sexual and Somatic Polyploid Hybrids of Some Tropical Species

Pagliarini¹,

Vieira²,

Valle³

2012

Meiosis - Molecular Mechanisms and Cytogenetic Diversity

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Section: Some Considerations About the Brachiaria Genusmentioning

confidence: 99%

Meiotic Behavior in Intra- and Interspecific Sexual and Somatic Polyploid Hybrids of Some Tropical Species

Pagliarini¹,

Vieira²,

Valle³

2012

Meiosis - Molecular Mechanisms and Cytogenetic Diversity

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“…Regardless of an adequate supply of germplasm, breeding programs required knowledge of the reproductive mode, number of chromosomes, and meiotic behavior within and between compatible species in order to select strains for crossbreeding (MENDES-BONATO et al, 2006). Wild and crossbred plants have variable meiotic behavior among genotypes.…”

Section: Introductionmentioning

confidence: 99%

Genetic stability in synthetic wheat accessions: cytogenetic evaluation as a support in breeding programs

et al. 2017

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Synthetic wheat is developed by crossing tetraploid species ( Triticum turgidum , AABB) with a diploid species ( Aegilops tauschii , DD), followed by chromosome duplication through the use of colchicine to restore the resultant sterile hybrid to a fertile hexaploid plant. The main importance of producing synthetically improved wheat is to increase their genetic variability and to incorporate genes that code for resistance to biotic and abiotic stressors. This study aimed to evaluate the presence of micronuclei (MN) and the meiotic index (MI) in the tetrad phase in synthetic wheat accessions and cultivars ( Triticum aestivum ) stored at the Germplasm Bank of Embrapa Trigo (Brazil), in order to identify and select genetically stable accessions for plant improvement. Five plants were collected by genotype, prior to anthesis, and the tissues were fixed in Carnoy solution. Cytological slides were prepared by the smash method, and the cells were dyed with 1% acetocarmine and observed under an optical microscope. Presence of MN was observed in all genotypes analyzed, and variability of genetic stability was reported in the two years of analysis. In 2014, the highest MI of synthetic wheat accessions was 96.86% and the lowest was 46.32%. In 2015, the highest MI was 96.60% and the lowest was 47.96%. Based on the results, some genotypes were considered meiotically stable and suitable for use in wheat breeding programs.

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“…Therefore, determination of the meiotic index revealing the percentage of normal tetrads and stability of meiotic behavior has been considered as an important criterion in meiotic studies of plant species. The studies also indicated that chromosome characteristic and their meiotic behavior could also be exploited as a practical tool for choosing parental species to crossing in Gramineae (Mendes-Bonata et al 2006, Mendes-Bonata et al 2009). Many studies have been conducted on the meiotic chromosome behavior of different wheat species (Bodanese-Zanettini et al 1983, Chaubey and Khanna 1988, Jauhar 1992, Naranjo 1995.…”

mentioning

confidence: 99%

“…behavior within and among compatible species in order to direct the crosses (Mendes-Bonata et al 2006). Meiosis is an event of high evolutionary stability which ceases in a reduction of chromosome number.…”

mentioning

confidence: 99%

“…Meiosis, as a highly coherent integrated process, involves 3 major tasks of co-orientation of homologous chromosomes into the opposite cell poles, reduction of chromosome number and recombination (Cnudde and Gerats 2005). The most common abnormalities reported in the Gramineae family included precocious chromosome migration to the poles and laggards in metaphases and micronuclei in tetrads (Mendes-Bonata et al 2006). The failure of chromosome pairing or formation of multivalent chromosomes has often been observed even in pure varieties of common wheat (Watanabe 1962).…”

mentioning

confidence: 99%

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Meiotic Behavior of Wild, Synthetic and Cultivated Wheats

2010

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Summary Wild relatives of bread wheat are potential sources of valuable genetic materials for wheat improvement. Genomic relationship and cross-ability between plant species can be deduced from chromosomal structure, size and behavior during meiotic division. In this study, the meiotic behavior of 21 wheat genotypes possessing the 3 ploidy levels of diploid, tetraploid and hexaploid and belonging to 3 wild, cultivated and synthetic growing statuses was investigated. The results indicated that the average number of ring bivalents at metaphase I ranged from 60 to 100% in the studied genotypes with the lowest rate belonging to the diploid wild relative wheat species. Four meiotic abnormalities including (1) precocious chromosome migration to the poles at metaphase I, (2) laggard chromosomes at anaphase I and telophase I, (3) chromosome stickiness and chromosome bridge at anaphase I and (4) formation of micronuclei at telophase I and in the tetrad cells were found in the studied genotypes. The highest meiotic abnormalities were found in synthetic wheat accessions. The average value of the meiotic index for the studied wheat genotypes was above 99%, revealing their normal meiotic behavior.

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Chromosome number and meiotic behaviour inBrachiaria jubata (Gramineae)

Cited by 40 publications

References 8 publications

Meiotic Behavior in Intra- and Interspecific Sexual and Somatic Polyploid Hybrids of Some Tropical Species

Meiotic Behavior in Intra- and Interspecific Sexual and Somatic Polyploid Hybrids of Some Tropical Species

Genetic stability in synthetic wheat accessions: cytogenetic evaluation as a support in breeding programs

Meiotic Behavior of Wild, Synthetic and Cultivated Wheats

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