Transcriptome Association Identifies Regulators of Wheat Spike Architecture

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...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 2017-10, Vol.175 (2), p.746-757
Main Authors: Wang, Yuange, Yu, Haopeng, Tian, Caihuan, Sajjad, Muhammad, Gao, Caixia, Tong, Yiping, Wang, Xiangfeng, Jiao, Yuling
Format: Article
Language:English
Subjects:
Alleles
Gene Expression Profiling
GENES, DEVELOPMENT, AND EVOLUTION
Genotype
Inflorescence - anatomy & histology
Inflorescence - genetics
Phenotype
Phylogeny
Seeds - anatomy & histology
Seeds - genetics
Species Specificity
Transcriptome
Triticum - anatomy & histology
Triticum - genetics
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Summary: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.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.17.00694