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Fine mapping of KLW1 that conditions kernel weight mainly through regulating kernel length in wheat (Triticum aestivum L.)

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Abstract

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KLW1 was localized to a 0.6 cM interval near the centromere of chromosome 4B and found to be dominant in conditioning longer kernels and higher kernel weight.

Abstract

Kernel weight is a major wheat yield component and affected by kernel dimensions, filling process and kernel density. Because of this complexity, the mechanism underlying kernel weight is still far from clear. Qtgw.nau-4B or KLW1 was a major kernel weight QTL identified in the Nanda2419 × Wangshuibai population. We showed that introduction of the Nanda2419 allele into elite cultivar Wenmai6 resulted in longer kernels as well as higher kernel weight, without affecting other traits such as spike number per plant, plant height, spike length, spikelet number per spike, and kernel number per spike. KLW1 was dominant in conditioning higher kernel weight and functioned mainly through affecting kernel length. Using F2 plants derived from KLW1 NIL, a high-density genetic map covering the QTL was constructed. KLW1 was consequently confined to the 0.6 cM Xwgrc4219-Xwgrc4067 interval by evaluating the recombinant lines in three field trials. KLW1 is complementary to KT1, the QTL on chromosome 5A of Nanda2419 for thicker and heavier kernels, in producing larger kernels with higher commercial value, augmenting its usefulness in wheat breeding.

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Acknowledgements

This work was partially supported by National Natural Science Foundation of China (31872867, 31430064), National Key Research and Development Program of China (2022YFF1002902), Natural Science Foundation of Jiangsu (BK20221509), Seed Industry Revitalization Project of Jiangsu Province (JBGS2021013, and Jiangsu collaborative innovation initiative for modern crop production. We thank all the laboratory staff and graduate students for support of all experiments.

Funding

National Natural Science Foundation of China (31872867, 31430064), National Key Research and Development Program of China (2022YFF1002902), Natural Science Foundation of Jiangsu (BK20221509), Seed Industry Revitalization Project of Jiangsu Province (JBGS2021013, and Jiangsu collaborative innovation initiative for modern crop production partially supported this project.

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YY, LZ, RC, WH conduced genotyping and phenotyping. YY performed data analysis and prepared the draft; ZY, XQ, GL and YZ contributed to field trials; ZK, QX and HJ contributed to phenotyping, data collection and project supervision, YW helped project implementation, and ZM conceived the project and reviewed the manuscript.

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Correspondence to Zhengqiang Ma.

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Communicated by Susanne Dreisigacker.

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Yang, Y., Kong, Z., Xie, Q. et al. Fine mapping of KLW1 that conditions kernel weight mainly through regulating kernel length in wheat (Triticum aestivum L.). Theor Appl Genet 136, 110 (2023). https://doi.org/10.1007/s00122-023-04353-7

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  • DOI: https://doi.org/10.1007/s00122-023-04353-7

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