Backcrossing to increase meiotic stability in triticale

Giacomin, Renata Mussoi; Assis, Raissa Macedo; Brammer, Sandra Patussi; Nascimento, A. do; Silva, Paulo Roberto da

doi:10.4238/2015.september.22.21

Cited by 2 publications

(2 citation statements)

References 32 publications

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“…By backcrossing with apomictic plant may lead to produce superior lines hybrid. Backcrossing also can be used to improved genomic stability and pollen viability [6]. Therefore, important to figure out the characteristic of seed propagation on BC1F1 related to flowering ability.…”

Section: Introductionmentioning

confidence: 99%

Tiller Number and Flowering Ability on BC1F1 Progeny of Interspecific Hybridization in Ruzigrass (Urochloa ruziziensis)

Sidik Prasojo,

Nitthaisong,

Muguerza

et al. 2023

BIO Web Conf.

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The objective of this study focusing on production BC1F1 progeny of interspecific hybridization in ruzigrass (Urochloa ruziziensis) were to evaluate potential of pentaploid BC1F1 hybrid for seed propagation by associating with their tiller number, flowering, and shattering ability. In addition, we evaluate the function of various nitrogen dose on vegetative stages. Eight different genotypes were examined: B. ruziziensis ‘Kennedy’, B. decumbens ‘Basilisk’, pentaploid BC1F1 line derived from B. ruziziensis and Mulato (RM), pentaploid BC1F1 line derived from diploid B. ruziziensis and tetraploid B. ruziziensis (RR), and pentaploid BC1F1 lines derived from B. ruziziensis and B. decumbens (RD 1-4). The experimental plants treated with three level of nitrogen fertilizer (0, 4, and 8 kg/10a). Compared with parental line, RM line had high tiller number along with increasing level of nitrogen. For the flowering and shattering ability, the first lines to flowered and shattered was the pentaploid BC1F1 (RD 1-4), RR, and B. decumbens. Pentaploid BC1F1 lines derived from B. ruziziensis and B. decumbens (RD 1-4) had potential for seed propagation by associating with their flowering and shattering ability, while pentaploid BC1F1 line derived from B. ruziziensis and Mulato (RM) had the potential biomass production and yield ability by associating with its tiller number production.

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Section: Introductionmentioning

confidence: 99%

Tiller Number and Flowering Ability on BC1F1 Progeny of Interspecific Hybridization in Ruzigrass (Urochloa ruziziensis)

Sidik Prasojo,

Nitthaisong,

Muguerza

et al. 2023

BIO Web Conf.

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“…The formation of a hybrid genome and its subsequent stabilization are directly related to the normalization of the meiosis process and the correct chromosome segregation (Giacomin et al 2015). Incompatibility of centromeres of different species appears to be the main reason for the elimination of chromosomes of one of the parental genomes in hybrids (Sanei et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Cytogenetic and molecular characteristics of rye genome in octoploid triticale (× Triticosecale Wittmack)

Евтушенко¹,

Lipikhina²,

Stepochkin³

et al. 2019

CCG

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Alloploidization resulting from remote (interspecific or intergeneric) hybridization is one of the main factors in plant evolution, leading to the formation of new species. Triticale (× Triticosecale Wittmack, 1889) is the first artificial species created by crossing wheat (Triticum spp.) and rye (Secale cereale Linnaeus, 1753) and has a great potential as a grain and forage crop. Remote hybridization is a stress factor that causes a rapid reorganization of the parental genomes in hybrid progeny (“genomic shock”) and is accompanied by abnormalities in the chromosome set of hybrids. The formation of the hybrid genome and its subsequent stabilization are directly related to the normalization of meiosis and the correct chromosome segregation. The aim of this work was to cytogenetically characterize triticale (× Triticosecale rimpaui Wittmack, 1899, AABBDDRR) obtained by crossing Triticum aestivum Linnaeus, 1753. Triple Dirk D × Secale cereale L. Korotkostebel’naya 69 in F3–F6 generations of hybrids, and to trace the process of genetic stabilization of hybrid genomes. Also, a comparative analysis of the nucleotide sequences of the centromeric histone CENH3 genes was performed in wheat-rye allopolyploids of various ploidy as well as their parental forms. In the hybrid genomes of octoploid triticale an increased expression of the rye CENH3 variants was detected. The octoploid triticale plants contain complete chromosome sets of the parental subgenomes maintaining the chromosome balance and meiotic stability. For three generations the percentage of aneuploids in the progeny of such plants has been gradually decreasing, and they maintain a complete set of the paternal rye chromosomes. However, the emergence of hexaploid and new aneuploid plants in F5 and F6 generations indicates that stabilization of the hybrid genome is not complete yet. This conclusion was confirmed by the analysis of morphological features in hybrid plants: the progeny of one plant having the whole chromosome sets of parental subgenomes showed significant morphological variations in awn length and spike density. Thus, we expect that the results of our karyotyping of octoploid triticales obtained by crossing hexaploid wheat to diploid rye supplemented by comparative analysis of CENH3 sequences will be applicable to targeted breeding of stable octo- and hexaploid hybrids.

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Backcrossing to increase meiotic stability in triticale

Cited by 2 publications

References 32 publications

Tiller Number and Flowering Ability on BC1F1 Progeny of Interspecific Hybridization in Ruzigrass (Urochloa ruziziensis)

Tiller Number and Flowering Ability on BC1F1 Progeny of Interspecific Hybridization in Ruzigrass (Urochloa ruziziensis)

Cytogenetic and molecular characteristics of rye genome in octoploid triticale (× Triticosecale Wittmack)

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