Causal relationships between the polar nuclei in double fertilization and interspecific cross-incompatibility in Avena.

Nishiyama, Ichizo; Yabuno, Tomosaburo

doi:10.1508/cytologia.43.453

Cited by 79 publications

(46 citation statements)

References 32 publications

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“…4). This directional failure of hybridization is probably due to well-know phenomenon of unilateral incompatibility Nishiyama and Yabuno 1978). The seed phenotype, and especially the kernel (endosperm) phenotype, of each cross is shown.…”

Section: Introductionmentioning

confidence: 89%

“…The most striking feature of the hypothesis is that it predicts an antagonistic interaction between maternally and paternally inherited chromosomes in the endosperm. Nishiyama and Yabuno (1978) suggested that it would be possible to quantify this interaction using two values: firstly, a value intrinsic to each polar nucleus called the response value (RV); and secondly, a value intrinsic to the sperm termed the activation value (AV). They also quantified the degree of seed development as the activation index, found from the ratio AV/2RV.…”

Section: Introductionmentioning

confidence: 99%

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Reproductive barrier and genomic imprinting in the endosperm of flowering plants

Kinoshita

2007

Genes Genet. Syst.

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In flowering plants, success or failure of seed development is determined by various genetic mechanisms. During sexual reproduction, double fertilization produces the embryo and endosperm, which both contain maternally and paternally derived genomes. In endosperm, a reproductive barrier is often observed in inter-specific crosses. Endosperm is a tissue that provides nourishment for the embryo within the seed, in a similar fashion to the placenta of mammals, and for the young seedling after germination. This review considers the relationship between the reproductive barrier in endosperm and genomic imprinting. Genomic imprinting is an epigenetic mechanism that results in mono-allelic gene expression that is parent-of-origin dependent. In Arabidopsis, recent studies of several imprinted gene loci have identified the epigenetic mechanisms that determine genomic imprinting. A crucial feature of genomic imprinting is that the maternally and paternally derived imprinted genes must carry some form of differential mark, usually DNA methylation and/or histone modification. Although the epigenetic marks should be complementary on maternally and paternally imprinted genes within a single species, it is possible that neither the patterns of epigenetic marks nor expression of imprinted genes are the same in different species. Moreover, in hybrid endosperm, the regulation of expression of imprinted genes can be affected by upstream regulatory mechanisms in the male and female gametophytes. Species-specific variations in epigenetic marks, the copy number of imprinted genes, and the epigenetic regulation of imprinted genes in hybrids might all play a role in the reproductive barriers observed in the endosperm of interspecific and interploidy crosses. These predicted molecular mechanisms might be related to earlier models such as the "endosperm balance number" (EBN) and "polar nuclei activation" (PNA) hypotheses.

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Reproductive barrier and genomic imprinting in the endosperm of flowering plants

Kinoshita

2007

Genes Genet. Syst.

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“…The results of interspecific crosses of varying ploidy can be predicted by calculating an effective endosperm dose for the gametes of each species, the so-called endosperm balance number. This theory, also called polar nuclei activation (Nishiyama and Yabuno, 1978), predicts successes and failures observed during the mating of related taxa of oat, potato, and other species: crosses involving parents with the same endosperm balance number are most fertile regardless of ploidy. The endosperm balance number also predicts the failure of intraspecific interploidy crosses, as parental contributions to the endosperm are again out of balance.…”

Section: Reinterpretation Of Parent-of-origin Effects By Differentialmentioning

confidence: 99%

A Differential Dosage Hypothesis for Parental Effects in Seed Development

2004

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“…Additionally, maternal effects of gene expression patterns decreased with successive self-pollinations. These lines of evidence suggest that maternal dominance from double fertilization, which promotes maternal gene expression in the embryo of descendants, plays a key role in the stages of allopolyploidization and genome stabilization in plants (Nishiyama and Yabuno, 1978;Lafon-Placette and Köhler, 2014). …”

Section: Discussionmentioning

confidence: 99%

Comparison of genome-wide gene expression patterns in the seedlings of nascent allohexaploid wheats produced by two combinations of hybrids

et al. 2015

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Allopolyploidization in plants is an important event that enhances heterosis and environmental adaptation. Common wheat, Triticum aestivum (AABBDD), which is an allohexaploid that evolved from an allopolyploidization event between T. turgidum (AABB) and Aegilops tauschii (DD), shows more growth vigor and wider adaptation than tetraploid wheats. To better understand the molecular basis for the heterosis of hexaploid wheat, we systematically analyzed the genomewide gene expression patterns of two combinations of newly hybridized triploids (ABD), their chromosome-doubled hexaploids (AABBDD), stable synthetic hexaploids (AABBDD) and natural hexaploids, in addition to their parents, T. turgidum (AABB) and Ae. tauschii (DD), using a microarray to reconstruct the events of allopolyploidization and genome stabilization. Overall comparisons of gene expression profiles showed that the newly generated hexaploids exhibited gene expression patterns similar to those of their maternal tetraploids, irrespective of hybrid combination. With successive generations, the gene expression profiles of nascent hexaploids became less similar to the maternal profiles, and belonged to a separate cluster from the natural hexaploids. Triploids revealed characteristic expression patterns, suggesting endosperm effects. In the newly hybridized triploids (ABD) of two independent synthetic lines, approximately onefifth of expressed genes displayed non-additive expression; the number of these genes decreased with polyploidization and genome stabilization. Approximately 20% of the non-additively expressed genes were transmitted across generations throughout allopolyploidization and successive self-pollinations, and 43 genes overlapped between the two combinations, indicating that shared gene expression patterns can be seen during allohexaploidization. Furthermore, four of these 43 genes were involved in starch and sucrose metabolism, suggesting that these metabolic events play key roles in the hybrid vigor of hexaploid wheat.

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Causal relationships between the polar nuclei in double fertilization and interspecific cross-incompatibility in Avena.

Cited by 79 publications

References 32 publications

Reproductive barrier and genomic imprinting in the endosperm of flowering plants

Reproductive barrier and genomic imprinting in the endosperm of flowering plants

A Differential Dosage Hypothesis for Parental Effects in Seed Development

Comparison of genome-wide gene expression patterns in the seedlings of nascent allohexaploid wheats produced by two combinations of hybrids

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