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The fine mapping of dwarf gene Rht5 in bread wheat and its effects on plant height and main agronomic traits

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Abstract

Main conclusion

Rht5 was narrowed to an approximately 1 Mb interval and had pleiotropic effects on plant height, spike length and grain size. TraesCS3B02G025600 was predicted as the possible candidate gene.

Abstract

Plant height is an important component related to plant architecture, lodging resistance, and yield performance. The utilization of dwarf genes has made great contributions to wheat breeding and production. In this study, two F2 populations derived from the crosses of Jinmai47 and Ningchun45 with Marfed M were employed to identify the genetic region of reduce plant height 5 (Rht5), and their derived lines were used to evaluate its effects on plant height and main agronomic traits. Rht5 was fine-mapped between markers Kasp-25 and Kasp-23, in approximately 1 Mb region on chromosome 3BS, which harbored 17 high-confidence annotated genes based on the reference genome of Chinese Spring (IWGSC RefSeq v1.1). TraesCS3B02G025600 were predicted as the possible candidate gene based on its differential expression and sequence variation between dwarf and tall lines and parents. The results of phenotypic evaluation showed that Rht5 had pleiotropic effects on plant height, spike length, culm diameter, grain size and grain yield. The plant height of Rht5 dwarf lines was reduced by an average of 32.67% (32.53 cm) and 27.84% (33.62 cm) in the Jinmai47 and Ningchun45 population, respectively. While Rht5 showed significant and negative pleiotropic effects on culm diameter, aboveground biomass, grain yield, spike length, spikelet number, grain number per spike, grain size, grain weight and filling degree of basal second internode. The culm lodging resistance index (CLRI) of dwarf lines was significantly higher than that of tall lines in the two population. In conclusion, these results lay a foundation for understanding the dwarfing mechanism of Rht5.

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All data generated or analyzed during this study are included in the article and its supplementary material.

Abbreviations

BR:

Brassinosteroid

BSA:

Bulk segregation analysis

GA:

Gibberellin

InDel:

Insertion and deletion

KASP:

Kompetitive allele-specific PCR

Rht :

Reduce plant height

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Acknowledgements

This work was financially supported by National Natural Science Foundation of China (32171991), Key Research and Development Program of Shaanxi Province (2021KWZ-23), the China 111 Project (B12007) and the Tang Chung Ying Breeding Funds (NWAFU), P. R. China; and the ACIAR Project (CIM/2005/111) of Australia.

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Correspondence to Liang Chen or Yin-Gang Hu.

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All authors declare that they have no conflict of interest.

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We declare that these experiments complied with the ethical standards in China.

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Communicated by Dorothea Bartels.

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Cui, C., Lu, Q., Zhao, Z. et al. The fine mapping of dwarf gene Rht5 in bread wheat and its effects on plant height and main agronomic traits. Planta 255, 114 (2022). https://doi.org/10.1007/s00425-022-03888-1

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  • DOI: https://doi.org/10.1007/s00425-022-03888-1

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