Abstract
Wheat is the major cereal crop in the world. While wheat proteins provide the nutritional requirement for humans, the major concern associated with them is their intolerance among a large genetically predisposed population. These proteins include gluten, albumins like amylase/trypsin inhibitors (ATIs), serpins, thionins, and defensins. In this study, we performed a comparative (bread vs. durum wheat) expression analysis of the genes encoding for different intolerant proteins (IP) during grain development, through transcriptomics approach. Two libraries were generated from each genotype with an average of 103.81 million reads, resulting in 121.3K transcripts for bread wheat; and 75.20 million reads resulting in 117.7K transcripts for durum wheat. RNA-seq results were validated through qRT-PCR. All transcripts related to IPs were extracted; 146 and 133 transcripts were identified in case of bread and durum wheat, respectively. However, only five IP genes were differentially expressed (DEGslog2fold>2) and all of them were classified under the GO terms ‘Molecular Function’. For comparative expression of the IP genes between the two genotypes, fragments per kilobase of exon model per million reads mapped (FPKM) values of each gene were studied. None of the IP transcripts were falling in any pathway, that is because these IPs are synthesized from the genes through transcription followed by translation. These IPs, during grain development, belonged to the major categories of thionin, serpin, ATI, gliadin and glutenin. Bread wheat was expressing a greater number of IP genes and mostly they were upregulated in comparison to the durum wheat. Highest numbers of IP transcripts were mapped on the BB genome; and maximum IP genes were located in chromosome1D. IP genes with higher expression in both the genotypes were further analysed for their stage-specific expression during grain development. Thionins, gliadins and glutenins were mainly expressed at 4–5 weeks after anthesis (WAA); whereas, serpins and ATIs were expressed at 3–4 WAA. The expression of thionin and serpin genes was comparatively low throughout the grain development process, when compared to other IPs. We have also analysed the transcripts related to amylose and amylopectin biosynthesis, where durum wheat showed a high amylose: amylopectin ratio in comparison to bread wheat. Our study through transcriptome analysis is another support for the hypothesis that tetraploid durum wheat is less intolerant and better for consumption for the vulnerable population than that of hexaploid bread wheat.
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Acknowledgements
Authors acknowledge the financial support by CRP on Biofortification, Indian Council of Agricultural Research (ICAR) and Department of Biotechnology, Govt. of India for carrying out the work. Authors would also like to acknowledge the support and guidance provided by the Director, ICAR-National Institute for Plant Biotechnology, New Delhi.
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Research work for this study was funded by Indian Council of Agricultural Research—Consortium Research Project on Biofortification vide Sanction Order F.No. CS/F.No.16-8/2017-IA IV dated 26th October 2017 and Department of Biotechnology, Govt. of India vide Sanction Order No. BT/PR7469/FNS/20/733/2013 dated 10th September 2014.
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Conceptualization, PKM and MK; Data curation, PKM; Formal analysis, MK and EM; Funding acquisition, PKM; Investigation, PKM; Methodology, MK; Project administration, PKM; Resources, PKM; Software, MK, EM; Supervision, PKM; Validation, MK; Visualization, PKM GM, AM; Writing—original draft, MK; Writing—review and editing PKM, AM, GM, SM, MK, EM. All authors contributed to the article and approved the submitted version.
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Kaushik, M., Mulani, E., Mahendru-Singh, A. et al. Comparative Expression Profile of Genes Encoding Intolerant Proteins in Bread vs. Durum Wheat During Grain Development. J Plant Growth Regul 42, 3200–3210 (2023). https://doi.org/10.1007/s00344-022-10785-0
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DOI: https://doi.org/10.1007/s00344-022-10785-0