Synthesis, morphology and cytogenetics of Raphanofortii (TTRR, 2n = 38): a new amphidiploid of hybrid Brassica tournefortii (TT, 2n = 20) ×Raphanus caudatus (RR, 2n=18)

Choudhary, B. R.; Joshi, P.; Singh, Kamaldeep

doi:10.1007/s001220051572

Cited by 18 publications

(11 citation statements)

References 16 publications

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“…This showed that some of chromosomes of these 3 genomes had duplicate archetypes and confirmed the hypothesis of the secondary polyploidy origin of the B, C and T genomes. Secondly, the lower average chromosome association observed in the present BCT hybrid, compared to that reported in an ABC hybrid by Choudhary et al (2000b), suggested that the T genome was more distantly related than A to both the B and C genomes. Inter-genomic chromosome associations noticed in the hybrid indicated the possibility of transferring genes across the species through interspecific hybridization.…”

Section: Discussioncontrasting

confidence: 56%

“…Besides the transfer of useful traits across the species in genus Brassica (Roy 1984, Rahman 2001, Rygulla et al 2007, such crosses were widely used to create genetic variability (Prakash 1973a), genetic diversity (Choudhary and Joshi 2001) and to synthesize artificially new species such as Brassicoraphanus (Tokumasu 1970) Brassica napocampestris (McNaughton 1973) and Raphanofortii (Choudhary et al 2000a). Both B. carinata and B. tournefortii species have their own advantage and deficiencies.…”

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confidence: 99%

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Crossability of Brassica carinata and B. tournefortii, and Cytomorphology of Their F1 Hybrid

Choudhary¹,

Joshi²

2012

CYTOLOGIA

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Summary Reciprocal crosses between Brassica carinata (BBCC, 2n=34) and B. tournefortii (TT, 2n=20) were attempted in order to determine crossability between the species, carry out chromosomal associations among the B, C and T genomes, and to study morphology of the interspecific hybrids. A hybrid between these 2 species was obtained only when B. carinata was used as a female parent. Morphologically, the hybrid was intermediate between the progenitor species but its leaves resembled B. carinata. The F 1 plant was tall but grew very slowly. The hybrid was almost male sterile, showing only 2.3% pollen stainability. Meiotic studies of trigenomic triploid hybrid (BCT, 2n=27) showed various chromosome configurations including quadrivalents (0-1), trivalents (0-2), bivalents (2-9) and univalents (5-23). Only 5 univalents were recorded to have occurred; otherwise trivalents and bivalents were observed in pollen mother cells of the BCT hybrid. A few chromosomal association could be expected through allosyndesis which suggests the possibility of transferring genes across the species through interspecific hybridization.

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Section: Discussioncontrasting

confidence: 56%

mentioning

confidence: 99%

Crossability of Brassica carinata and B. tournefortii, and Cytomorphology of Their F1 Hybrid

Choudhary¹,

Joshi²

2012

CYTOLOGIA

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“…The fertility of hybrids would be restored to some extent after doubling chromosomes. An extensive breeding program based on doubling chromosomes of the intra-and interspecies or intergeneric hybrids to create higher ploidy varieties has been in progress since 1980s (Lange et al 1989;Choudhary et al 2000;Momotaz et al 2000;Bhaskar et al 2002;Banga et al 2003;Chandra et al 2004;Wen et al 2008;Chen et al 2011). Through this pathway, some artificial syntheses of Brassica amphidiploids have led to the creation of new species.…”

Section: Introductionmentioning

confidence: 97%

“…Besides the cultivated species, there is a large number of wild species in the Brassica genus. To date, many wild Brassica species have been recognized to possess various resistant characters which are valuable for crop breeding, for example, Brassica spinescens has the resistance to white rust (Kirti et al 1991), Brassica tournefortii resists or tolerate aphids (Liphaphis erismi) and pathogens such as Albugo candida (Choudhary et al 2000). Brassica maurorum (MM, 2n = 16) is resistant to white rust and Alternaria blight (Chrungu et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Different fertility and meiotic regularity in allohexaploids derived from trigenomic hybrids between three cultivated Brassica allotetraploids and B. maurorum

Yao

2011

Plant Cell Rep

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The wild species Brassica maurorum Durieu (MM, 2n = 16) is useful for the improvement of Brassica crops. Herein, interspecific reciprocal crosses between B. maurorum and three cultivated Brassica allotetraploids were carried out with the aid of embryo rescue. Trigenomic hybrids with Brassica napus (AACC, 2n = 38) and Brassica carinata (BBCC, 2n = 34) were produced from reciprocal crosses, but the hybrids with Brassica juncea (AABB, 2n = 36) were obtained only when B. maurorum was used as female. All the hybrids were morphologically intermediate between their parents, and were male and female sterile. By in vitro chromosome doubling of the trigenomic hybrids, the allohexaploids (AACC.MM/MM.AACC, 2n = 54; BBCC.MM, 2n = 50; MM.AABB, 2n = 52) were established and characterized for their phenotype and cytology. The fertilities of three allohexaploids were different, for AACC.MM and MM.AACC failed to produce seeds by selfing, but BBCC.MM showed low seed-set and MM.AABB had good seed-set. They also expressed variable extents of male meiotic regularity as to chromosome pairing and segregation, with MM.AABB > BBCC.MM > AACC.MM/MM.AACC, the same order as their fertility. So their meiotic behavior contributed to the fertility. Finally, the potential of these allohexaploids as a bridge for genetic improvement of Brassica crops was discussed.

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“…It has been used for many decades not only for wheat cultivars [45] but also for many other crops (e.g. Brassicaceae [46], Gossypium sp. [47], Cucumis sp.…”

Section: Wild-to-crop Bridgesmentioning

confidence: 99%

Genetic and Ecological Consequences of Transgene Flow to the Wild Flora

Felber

Kozlowski

Arrigo

et al.

Green Gene Technology

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Synthesis, morphology and cytogenetics of Raphanofortii (TTRR, 2n = 38): a new amphidiploid of hybrid Brassica tournefortii (TT, 2n = 20) ×Raphanus caudatus (RR, 2n=18)

Cited by 18 publications

References 16 publications

Crossability of <i>Brassica carinata</i> and <i>B. tournefortii</i>, and Cytomorphology of Their F<sub>1</sub> Hybrid

Crossability of <i>Brassica carinata</i> and <i>B. tournefortii</i>, and Cytomorphology of Their F<sub>1</sub> Hybrid

Different fertility and meiotic regularity in allohexaploids derived from trigenomic hybrids between three cultivated Brassica allotetraploids and B. maurorum

Genetic and Ecological Consequences of Transgene Flow to the Wild Flora

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