Synthetic hexaploid wheat and its utilization for wheat genetic improvement in China

Yang, Wuyun; Liu, Dengcai; Li, Jun; Zhang, Lianquan; HuiTing, Wei; Hu, Xiaorong; Zheng, Youliang; He, Zhouhu; Zou, Yuchun

doi:10.1016/s1673-8527(08)60145-9

Cited by 133 publications

(80 citation statements)

References 39 publications

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“…In addition, synthetic wheat can cross with modern cultivars without obvious reproductive barriers, indicating that there is almost instant genetic stabilization . Meanwhile, they are important resources for introgression of needed traits from wild relatives of wheat (Yang et al, 2009). For all of these reasons, many studies have examined gene expression patterns in nascent and stable allohexaploid wheats (He et al, 2003;Bottley et al, 2006;Pumphrey et al, 2009;Akhunova et al, 2010;Chagué et al, 2010;Qi et al, 2012;Chelaifa et al, 2013;Zhang et al, 2013a).…”

Section: Discussion Allohexaploid Wheat As a Model For Heterosis Studiesmentioning

confidence: 99%

mRNA and Small RNA Transcriptomes Reveal Insights into Dynamic Homoeolog Regulation of Allopolyploid Heterosis in Nascent Hexaploid Wheat

et al. 2014

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Section: Discussion Allohexaploid Wheat As a Model For Heterosis Studiesmentioning

confidence: 99%

mRNA and Small RNA Transcriptomes Reveal Insights into Dynamic Homoeolog Regulation of Allopolyploid Heterosis in Nascent Hexaploid Wheat

et al. 2014

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“…Breeding for Z. tritici resistance in bread wheat using synthetic wheat hexaploids, derived from tetraploid ancestors and the recently sequenced Aegilops tauschii (Zimin et al 2017), has also been proven as a valuable resource for common wheat improvement (Yang et al 2009). For Z. tritici, Stb16q that originates from the synthetic hexaploid M3 (W-7976) has the widest efficacy.…”

Section: Genetic Makeup Of Durum Wheat Resistance To Stb: the Drasticmentioning

confidence: 99%

“…In bread wheat breeding, valuable genes for resistance have been identified and deployed that originate from wild ancestors (Mujeeb-Kazi et al 1996;Tabib Ghaffary et al 2012;Yang et al 2009). For instance, the Stb5 gene was identified in a synthetic hexaploid derived from T. turgidum ssp.…”

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Durum wheat and septoria tritici blotch: genes and prospects for breeding

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“…tauschii ssp. strangulata accession AS2404 (DD, 2n = 2x = 14) [11,22,23]. Seeds were germinated on moist filter papers, transplanted into soil, and grew in a controlled environment [24].…”

Section: Plant Materials and Ga Treatmentmentioning

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Divergence in homoeolog expression of the grain length-associated gene GASR7 during wheat allohexaploidization

et al. 2015

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Hexaploid wheat has triplicated homoeologs for most of the genes that are located in subgenomes A, B, and D. GASR7, a member of the Snakin/GASA gene family, has been associated with grain length development in wheat. However, little is known about divergence of its homoeolog expression in wheat polyploids. We studied the expression patterns of the GASR7 homoeologs in immature seeds in a synthetic hexaploid wheat line whose kernels are slender like those of its maternal parent (Triticum turgidum, AABB, PI 94655) in contrast to the round seed shape of its paternal progenitor (Aegilops tauschii, DD, AS2404). We found that the B homoeolog of GASR7 was the main contributor to the total expression level of this gene in both the maternal tetraploid progenitor and the hexaploid progeny, whereas the expression levels of the A and D homoeologs were much lower. To understand possible mechanisms regulating different GASR7 homoeologs, we firstly analyzed the promoter sequences of three homoeologous genes and found that all of them contained gibberellic acid (GA) response elements, with the TaGASR7B promoter (pTaGASR7B) uniquely characterized by an additional predicted transcriptional enhancer. This was confirmed by the GA treatment of spikes where all three homoeologs were induced, with a much stronger response for TaGASR7B. McrBC enzyme assays showed that the methylation status at pTaGASR7D was increased during allohexaploidization, consistent with the repressed expression of TaGASR7D. For pTaGASR7A, the distribution of repetitive sequence-derived 24-nucleotide (nt) small interfering RNAs (siRNAs) were found which suggests possible epigenetic regulation because 24-nt siRNAs are known to mediate RNA-dependent DNA methylation. Our results thus indicate that both genetic and epigenetic mechanisms may be involved in the divergence of GASR7 homoeolog expression in polyploid wheat.

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Synthetic hexaploid wheat and its utilization for wheat genetic improvement in China

Cited by 133 publications

References 39 publications

mRNA and Small RNA Transcriptomes Reveal Insights into Dynamic Homoeolog Regulation of Allopolyploid Heterosis in Nascent Hexaploid Wheat

mRNA and Small RNA Transcriptomes Reveal Insights into Dynamic Homoeolog Regulation of Allopolyploid Heterosis in Nascent Hexaploid Wheat

Durum wheat and septoria tritici blotch: genes and prospects for breeding

Divergence in homoeolog expression of the grain length-associated gene GASR7 during wheat allohexaploidization

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