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Genome-wide association study identified novel genetic loci controlling internode lengths and plant height in common wheat under different nitrogen treatments

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Abstract

Nitrogen is an important nutrient for crop growth and development. Plant height-related traits can be affected by nitrogen supplementation. In this study, we performed a genome-wide association study (GWAS) on plant height, spike length, length of different internodes, and lodging resistance strength at the grain-filling stage based on wheat local varieties subjected to low nitrogen and normal (CK) treatments. GWAS analysis showed that a total of 86 quantitative trait locus (QTLs) were detected, including 13 QTLs for plant height, 10 QTLs for spike length, 19 QTLs for the length of the first internode from the top of the plant, 6 QTLs for the second internode length, 11 QTLs for the third internode length, 13 QTLs for the fourth internode length, and 14 QTLs for the fifth internode length. Compared to the CK treatment, the plant height, spike length, and fourth and fifth internode lengths were significantly affected by the low nitrogen treatment. A total of 18 QTLs responding to low nitrogen level were detected, including three QTLs for the fourth internode length detected on 3A, 6A, and 6D chromosomes, eleven QTLs for the fifth internode length on 1A, 1B, 1D, 2A, 2B, 3A, 3B, 4A, 5B and 7B chromosomes, one QTL for spike length on 3A chromosome, and one QTL for plant height on 5B chromosome. These QTLs will enhance our understanding of the genetic basis of plant height responses to nitrogen deficiency and will benefit genetic reactions to nitrogen fertilization.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (2016YFD0102000), National Natural Science Foundation of China (31671675), and Natural Science Foundation of Shandong Province (ZR2015CM034 and ZR2016CM30).

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Piyi Xing performed the experiments and prepared the manuscript. Xia Zhang and Dandan Li performed partial experiments. Yinguang Bao and Honggang Wang performed partial experiments and revised the manuscript. Xingfeng Li designed the experiment and prepared the manuscript. All authors reviewed and approved the manuscript.

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Correspondence to Yinguang Bao or Xingfeng Li.

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The manuscript has not been submitted to other journals for simultaneous consideration. The submitted article is original and has not been published elsewhere in any form or language. This study was not be split up into several parts to increase the number of submissions and submitted to various journals or one journal over time. Results are presented clearly, honestly, and without fabrication, falsification, or inappropriate data manipulation (including image-based manipulation). No data, text, or theories by others are presented as if they were the author’s own. Authors have permission for the use of software questionnaires surveys and scales. References articles are cited appropriate and relevant literature in support of the claims made. Authors avoid untrue statements about an entity or descriptions of their behavior or actions that could potentially be seen as personal attacks or allegations about that person. Research has no threat to public health or national security. The author group, the Corresponding Author, and the order of authors are all correct. *Authors respect all of the above guidelines and third parties' rights such as copyright and/or moral rights.

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Figure S1 Density of final SNPs used for GWAS among all chromosomes (TIF 923 kb)

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Figure S2 LD of the whole genome and subgenome and comparison of the same traits in the CK and LN environments (TIF 584 kb)

Figure S3 The correlation and distribution of PH-related traits in different environments (TIF 7108 kb)

Figure S4 QQ plot of significant SNPs for PH-related traits (TIF 2528 kb)

Figure S5 QQ plot of significant SNPs for PH-related traits under LN stress (TIF 346 kb)

Table S1 Information on 120 wheat varieties, including major planting area and times (XLSX 10 kb)

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Table S2 The number of SNPs across 21 chromosomes and comparison of the same trait in LN and CK environments and four subpopulations (XLSX 12 kb)

Table S3 ANOVA and h2 results and comparisons of the traits in the LN and CK environments (XLSX 16 kb)

Table S4 All QTLs in the CK and LN environments associated with PH-related traits (XLSX 36 kb)

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Xing, P., Zhang, X., Li, D. et al. Genome-wide association study identified novel genetic loci controlling internode lengths and plant height in common wheat under different nitrogen treatments. Euphytica 218, 146 (2022). https://doi.org/10.1007/s10681-022-03093-x

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