Genetic diversity and construction of core collection in Chinese wheat genetic resources

Hao, Chenyang; Dong, Yuchen; Wang, Lanfen; You, Guang-Xia; Zhang, Hongna; Ge, Hongmei; Jia, Jizeng; Zhang, Xueyong

doi:10.1007/s11434-008-0212-x

Cited by 96 publications

(95 citation statements)

References 20 publications

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“…With a long history of cultivation and artificial selection in diverse ecological zones, common wheat in China has a rich genetic diversity (He et al, 2001). A mini core collection of 231 Chinese wheat varieties, which is estimated to represent approximately 70% of the genetic diversity of the 23,090 varieties (Hao et al, 2008), widely used germplasm for wheat breeding in China. Based on geographical regions and allelic diversity previously reported by Hao et al (2011), we selected 90 winter wheat varieties from 142 winter varieties within the mini core collection, including 74 landraces and 16 elite varieties ( Fig.…”

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confidence: 99%

Transcriptome Association Identifies Regulators of Wheat Spike Architecture

et al. 2017

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The architecture of wheat (Triticum aestivum) inflorescence and its complexity is among the most important agronomic traits that influence yield. For example, wheat spikes vary considerably in the number of spikelets, which are specialized reproductive branches, and the number of florets, which are spikelet branches that produce seeds. The large and repetitive nature of the three homologous and highly similar subgenomes of wheat has impeded attempts at using genetic approaches to uncover beneficial alleles that can be utilized for yield improvement. Using a population-associative transcriptomic approach, we analyzed the transcriptomes of developing spikes in 90 wheat lines comprising 74 landrace and 16 elite varieties and correlated expression with variations in spike complexity traits. In combination with coexpression network analysis, we inferred the identities of genes related to spike complexity. Importantly, further experimental studies identified regulatory genes whose expression is associated with and influences spike complexity. The associative transcriptomic approach utilized in this study allows rapid identification of the genetic basis of important agronomic traits in crops with complex genomes.Grains of cereal crops provide a major source of human diet and nutrition. Improving grain yield is a primary objective during crop domestication and a major goal of crop-breeding programs. Inflorescence (spike) architecture dictates the capacity for seed production in cereal crops, including wheat (Triticum aestivum), the world's most widely grown cereal. In the archetypal bread wheat spike, the inflorescence meristem forms a limited number of lateral spikelet meristems (SMs) per rachis node, and a single terminal SM at the distal end. Each SM is indeterminate and typically produces two to four fertile florets that produce seeds (Fig. 1A; Supplemental Fig. S1; Bonnett, 1936;Fisher, 1973). Like maize (Zea mays) and rice (Oryza sativa), wheat yield per plant largely depends on the number of florets per spike and thus spike architecture. The numbers of SMs (and rachises) and florets per spikelet are major target traits for efforts aimed at improving wheat yield. In addition, the number of SMs per rachis may be increased to increase floret number, as in rare supernumerary spikelet variations.In rice, maize, and barley (Hordeum vulgare), multiple genes regulating spike development have been identified (Sreenivasulu and Schnurbusch, 2012;Tanaka et al., 2013). However, our understanding of wheat spike development remains rudimentary at the molecular level. In wheat, increased transcription levels of Q, an AP2-like gene, was markedly associated with spike compactness, suggesting that the Q gene may be implicated in spike development (Simons et al., 2006), although its role in spike complexity remains unclear. Feng et al. (2017) underlying the genetic regulation of rare supernumerary spikelet variations. For example, wheat Photoperiod1 (Ppd1) was identified as a regulator of paired spikelet formation (Boden et al., 2...

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confidence: 99%

Transcriptome Association Identifies Regulators of Wheat Spike Architecture

et al. 2017

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“…Two Chinese wheat populations were used in the study, namely 245 accessions from the Chinese wheat MCC representing 70% of the wheat genetic diversity of China and 348 modern cultivars from the Chinese wheat core collection (Hao et al, 2008. These two populations were selected from 23,705 accessions bred or collected in China (Zhang et al, 2002;Dong et al, 2003;Hao et al, 2008).…”

Section: Plant Materialsmentioning

confidence: 99%

“…These two populations were selected from 23,705 accessions bred or collected in China (Zhang et al, 2002;Dong et al, 2003;Hao et al, 2008). The MCC accessions were planted at the Chinese Academy of Agricultural Sciences (CAAS) Luoyang Experiment Station in Henan Province in 2002, 2005, and 2006.…”

Section: Plant Materialsmentioning

confidence: 99%

Global Selection on Sucrose Synthase Haplotypes during a Century of Wheat Breeding

et al. 2014

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Spike number per unit area, number of grains per spike, and thousand kernel weight (TKW) are important yield components. In China, increases in wheat (Triticum aestivum) yields are mainly due to increases in grain number per spike and TKW. TKW mainly depends on starch content, as starch accounts for about 70% of the grain endosperm. Sucrose synthase catalysis is the first step in the conversion of sucrose to starch, that is, the conversion of sucrose to fructose and UDP-glucose by the wheat sucrose synthase genes (TaSus1 and TaSus2) that are located on chromosomes 7A/7B/7D and 2A/2B/2D, respectively. A total of 1,520 wheat accessions were genotyped at the six loci. Two, two, five, and two haplotypes were identified at the TaSus2-2A, TaSus2-2B, TaSus1-7A, and TaSus1-7B loci, respectively. Their main variations were detected within the introns. Significant differences between the haplotypes correlated with TKW differences among 348 modern Chinese cultivars from the core collection. Frequency changes for favored haplotypes showed gradual increases in cultivars released since beginning of the last century in China, Europe, and North America. Geographic distributions and time changes of favored haplotypes were characterized in six major wheat production regions worldwide. Strong selection bottlenecks to haplotype variations occurred at polyploidization and domestication and during breeding of wheat. Genetic-effect differences between haplotypes at the same locus influence the selection time and intensity. This work shows that the endosperm starch synthesis pathway is a major target of indirect selection in global wheat breeding for higher yield.

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“…To test whether this negative correlation existed more broadly, we compared TaTRIP1 mRNA levels in the roots of 10 wheat varieties from Chinese wheat mini-core collections (Hao et al, 2008) and found that the wheat varieties with short primary roots had higher levels of TaTRIP1 mRNA in their roots than those with long primary roots ( Figure 7). …”

Section: Overexpressing Tatrip1 In Arabidopsis Inhibits Prl and Altermentioning

confidence: 99%

“…The 10 varieties with typical longer or shorter PRL were selected from Chinese wheat mini-core collections (Hao et al, 2008). These wheat varieties included four landraces and six commercial varieties.…”

Section: Experimental Procedures Materialsmentioning

confidence: 99%

A genotypic difference in primary root length is associated with the inhibitory role of transforming growth factor‐beta receptor‐interacting protein‐1 on root meristem size in wheat

Fang

et al. 2014

The Plant Journal

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SUMMARYPreviously we identified a major quantitative trait locus (QTL) qTaLRO-B1 for primary root length (PRL) in wheat. Here we compare proteomics in the roots of the qTaLRO-B1 QTL isolines 178A, with short PRL and small meristem size, and 178B, with long PRL and large meristem size. A total of 16 differentially expressed proteins were identified: one, transforming growth factor (TGF)-beta receptor-interacting protein-1 (TaTRIP1), was enriched in 178A, while various peroxidases (PODs) were more abundantly expressed in 178B. The 178A roots showed higher TaTRIP1 expression and lower levels of the unphosphorylated form of the brassinosteroid (BR) signaling component BZR1, lower expression of POD genes and reduced POD activity and accumulation of the superoxide anion O 2 À in the root elongation zone compared with the 178B roots. Low levels of 24-epibrassinolide increased POD gene expression and root meristem size, and rescued the short PRL phenotype of 178A. TaTRIP1 directly interacted with the BR receptor TaBRI1 of wheat. Moreover, overexpressing TaTRIP1 in Arabidopsis reduced the abundance of unphosphorylated BZR1 protein, altered the expression of BR-responsive genes, inhibited POD activity and accumulation of the O 2 − in the root tip and inhibited root meristem size. Our data suggested that TaTRIP1 is involved in BR signaling and inhibited root meristem size, possibly by reducing POD activity and accumulation of O 2 − in the root tip. We further demonstrated a negative correlation between the level of TaTRIP1 mRNA and PRL of landraces and modern wheat varieties, providing a valuable insight for better understanding of the molecular mechanism underlying the genotypic differences in root morphology of wheat in the future.

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Genetic diversity and construction of core collection in Chinese wheat genetic resources

Cited by 96 publications

References 20 publications

Transcriptome Association Identifies Regulators of Wheat Spike Architecture

Transcriptome Association Identifies Regulators of Wheat Spike Architecture

Global Selection on Sucrose Synthase Haplotypes during a Century of Wheat Breeding

A genotypic difference in primary root length is associated with the inhibitory role of transforming growth factor‐beta receptor‐interacting protein‐1 on root meristem size in wheat

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