Crossover effects of B chromosomes may be 'selfish'

Carlson, Wayne R.

doi:10.1038/hdy.1994.87

Cited by 10 publications

(8 citation statements)

References 22 publications

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“…Carlson, Roseman & Zheng (1993) have recently added another item to this discussion agenda, by proposing that Bs are selfish and that recombinational changes in the As of maize are simply side-effects of the Bs which reduce their own meiotic loss by increasing bivalent formation generally. In a later discussion paper Carlson (1994) has reviewed this new theory and has also pointed to the bias which has placed emphasis on studying B effects on A but the paucity of data relating to chiasma conditions in the Bs themselves. Ortiz et al (1995) have looked at the Bs and, using inbred lines of rye, have found variation in B pairing between lines as well as interactions between Bs and A genotypes; and the effects which the Bs have on the As seems to be independent of the effects that As exert on the Bs.…”

Section: A Chromosome Behaviourmentioning

confidence: 99%

B chromosomes in plants

1995

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summary This review of supernumerary B chromosome systems in flowering plants deals mainly with work published in the last 15 yr, hut also includes older material which has not hitherto been presented systematically. The term B chromosome (B) is defined, and there is an introductory overview dealing with general characteristics and the significance of Bs as a widespread chromosome polymorphism. Detailed sections are then presented covering the occurrence of Bs in different taxa, their structure and molecular organization, their irregular modes of inheritance, their phenotypic effects, population dynamics and origin. Particular attention is paid to the research growth points in molecular analysis of the structure and genome organization of Bs, and to transmission genotypes in the context of their adaptive versus their selfish properties. Where appropriate, reference is also made to likely future lines of research, and also to the usefulness of B chromosomes in genetic analysis and as model systems to study general phenomena of genome organization and evolution, nuclear physiology and architecture, chromosome polymorphism and selfish DNA.

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Section: A Chromosome Behaviourmentioning

confidence: 99%

B chromosomes in plants

1995

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“…We speculate that the B chromosome preservation is associated with the intrinsic characteristics of B chromosomes, such as B chromosome accumulation mechanisms (Roman, 1947(Roman, , 1948Carlson, 2007;Han et al, 2007), effect of B chromosomes on crossing over in A chromosomes (Hanson, 1969;Robertson, 1984;Carlson, 1994), or the function of B centromere (Jin et al, 2005). In particular, the uniqueness of B heterochromatin involved in the different timing of DNA replication between A and B chromosomes (Pryor et al, 1980) and in the histone modifications associated with both A and B chromosomes might contribute to B chromosome survival (Jin et al, 2008).…”

Section: B Chromosomes Evaded Chromosome Eliminationmentioning

confidence: 99%

Fertilization and Uniparental Chromosome Elimination during Crosses with Maize Haploid Inducers

et al. 2013

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Producing maternal haploids via a male inducer can greatly accelerate maize (Zea mays) breeding process. However, the mechanism underlying haploid formation remains unclear. In this study, we constructed two inducer lines containing cytogenetic marker B chromosome or alien centromeric histone H3 variant-yellow fluorescent protein vector to investigate the mechanism. The two inducer lines as the pollinators were crossed with a hybrid ZhengDan958. B chromosomes were detected in F1 haploids at a low frequency, which was direct evidence to support the occurrence of selective chromosome elimination during haploid formation. We found that most of the inducer chromosomes were eliminated in haploid embryonic cells during the first week after pollination. The gradual elimination of chromosomes was also detected in the endosperm of defective kernels, although it occurred only in some endosperm cells as late as 15 d after pollination. We also performed a genome-wide identification of single nucleotide polymorphism markers in the inducers, noninducer inbred lines, and 42 derived haploids using a 50K single nucleotide polymorphism array. We found that an approximately 44-Mb heterozygous fragment from the male parent was detected in a single haploid, which further supported the occurrence of paternal introgression. Our results suggest that selective elimination of uniparental chromosomes leads to the formation of haploid and possible defective kernels in maize as well, which is accompanied with unusual paternal introgression in haploid cells.

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“…(iv) Sel sh purposes: a variety of B-effects on chiasma frequency in different species may serve the sel sh purposes of each speci c B. Carlson has proposed three such sel sh functions (Carlson 1994). First, effects of B-chromosomes on A-chromosome chiasma frequency in maize might be explained as a side-effect of increased pairing between Bs to reduce B meiotic loss.…”

Section: Introductionmentioning

confidence: 99%

Host recombination is dependent on the degree of parasitism

Camacho

Bakkali

Corral

et al. 2002

Proc. R. Soc. Lond. B

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Parasites and hosts are involved in a continuous coevolutionary process leading to genetic changes in both counterparts. To understand this process, it is necessary to track host responses, one of which could be an increase in sex and recombination, such as is proposed by the Red Queen hypothesis. In this theoretical framework, the inducible recombination hypothesis states that B-chromosomes (genome parasites that prosper in natural populations of many living beings) elicit an increase in host chiasma frequency that is favoured by natural selection because it increases the proportion of recombinant progeny, some of which could be resistant to both B-chromosome effects and B-accumulation in the germline. We have found a clear parallelism between host recombination and the evolutionary status of the B-chromosome polymorphism, which provides explicit evidence for inducible recombination and strong support for the Red Queen hypothesis.

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Crossover effects of B chromosomes may be 'selfish'

Cited by 10 publications

References 22 publications

B chromosomes in plants

B chromosomes in plants

Fertilization and Uniparental Chromosome Elimination during Crosses with Maize Haploid Inducers

Host recombination is dependent on the degree of parasitism

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