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Identification of a new mutant allele of ZmYSL2 that regulates kernel development and nutritional quality in maize

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Abstract

The discovery and characterization of the opaque endosperm gene provide ideas and resources for the production and application of maize. We found an o213 mutant whose phenotype was opaque and shrunken endosperm with semi-dwarf plant height. The protein, lipid, and starch contents in the o213 endosperm were significantly decreased, while the free amino acid content in the o213 endosperm significantly increased. The aspartic acid, asparagine, and lysine contents were raised in the o213 endosperm by 6.5-, 8.5-, and 1.7-fold, respectively. Genetic analysis showed that this o213 mutant is a recessive single-gene mutation. The position mapping indicated that o213 is located in a 468-kb region that contains 11 protein-encoding genes on the long arm of chromosome 5. The coding sequence analysis of candidate genes between the WT and o213 showed that ZmYSL2 had only a single-base substitution (A–G) in the fifth exon, which caused methionine substitution to valine. Sequence analysis and the allelic test showed that o213 is a new mutant allele of ZmYSL2. The qRT-PCR results indicated that o213 is highly expressed in the stalks and anthers. Subcellular localization studies showed that o213 is a membrane transporter. In the variation analysis of o213, the amplification of 65 inbred lines in GWAS showed that this 3-bp deletion of the first exon of o213 was found only in temperate inbred lines, implying that the gene was artificially affected in the selection process. Our results suggest that o213 is an important endosperm development gene and may serve as a genetic resource.

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Funding

This research was funded and supported by China Agriculture Research System of MOF and MARA, and Sichuan Science and Technology Support Project (2021YFYZ0020, 2021YFYZ0027, 2021YFFZ0017).

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Y.W. designed the research and performed the experiment, analyzed data, and wrote the manuscript. H.H., H.Z., H.Z., Z.Z., and J.G. investigate the agronomic traits. D.L. and L.W. provide reagents and consumables. S.G. and D.G. contributed to plant materials management. X.Z. and B.L. revised the manuscript. S.G. contributed to critically reading this manuscript.

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Correspondence to Shibin Gao.

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The authors declare no competing interests.

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Supplementary Information

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11032_2022_1278_MOESM1_ESM.jpg

Figure S1. Comparison of the difference of metal ion concentration between WT and o213 kernels a Copper concentration of WT and o213 mutant in embryo, endosperm and seed of 18DAP and 27DAP. b Manganese concentration of WT and o213 mutant in embryo, endosperm and seed of 18DAP and 27DAP. c Zinc concentration of WT and o213 mutant in embryo, endosperm and seed of 18DAP and 27DAP. Student's t test, (*) P<0.05, (***) P<0.001, and n, not significant. (JPG 227 KB)

Figure S2. Analysis of the transmembrane domain of O213, the red box is the mutated amino acid (JPG 2188 KB)

Figure S3. The 3-bp deletion temperate inbred lines (SCL030, SCL033, SCL046, SCL082, SCL122) (Bar=1cm). (JPG 673 KB)

Figure S4. Protein structure prediction of O213 and WT (JPG 48 KB)

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Figure S5. Analysis of the transmembrane domain of the four genotypes, ZmYSL2 was used as a control. The red box is the deleted amino acid (JPG 862 KB)

Figure S6. Protein structure prediction of temperate inbred lines with a 3-bp deletion (JPG 91 KB)

11032_2022_1278_MOESM7_ESM.pdf

Table S1 Information on specific primers for gene mapping, cloning, qRT–PCR, subcellular localization and evolution analysis (PDF 110 KB)

Table S2 the sequence of o213 among temperate inbred lines, tropical inbred lines (PDF 217 KB)

11032_2022_1278_MOESM9_ESM.pdf

Table S3 Related agronomic traits and quality content data of the four genotypes, t-test among the traits of the four genotypes (PDF 23 KB)

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Wang, Y., Zhang, X., Luo, B. et al. Identification of a new mutant allele of ZmYSL2 that regulates kernel development and nutritional quality in maize. Mol Breeding 42, 7 (2022). https://doi.org/10.1007/s11032-022-01278-9

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  • DOI: https://doi.org/10.1007/s11032-022-01278-9

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