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Genetic Analysis of Rice Restorer Line Yazhan

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Abstract

Yazhan is a restorer rice line bred by Jiangxi Tianya Seed Industry Co., LTD, and its hybrid combination has a high yield, excellent rice quality, and strong resistance. In this study, Yazhan, Huazhan, and Zhanhui 15 were used as the experimental materials. Based on agronomic traits, SSR primer screening and second-generation resequencing were conducted to study the genetic basis of Yazhan. The results showed that the plant height of Yazhan was significantly lower than Zhanhui 15, and the yield was not different from the parent lines. The genetic material on chromosome 1, 3, 4, 5, and 10 in the genome of Yazhan were mainly from Zhanhui 15, genetic materials from chromosomes 2, 6, 8, 9, 11, and 12 mainly come from Huazhan, and the chromosomes 1, 5, and 6 had the most variation. In terms of genomic similarity, Yazhan was more similar to the male parent (Huazhan). Yazhan and Huazhan carried the Wxb genotype, while Zhanhui 15 carried the Wxa genotype. The amylose contents of Yazhan and Huazhan were significantly lower than Zhanhui 15. Yazhan and Huazhan carried the Pita blast resistance gene, and Zhanhui 15 carried the Pita susceptibility gene. The results of this study provide a theoretical reference for elucidating the genetic composition of Yazhan and determining the main genetic sources of its important agronomic traits.

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Abbreviations

AACC:

American Grain Chemical Association

AC:

Amylose content

BRR:

Brown rice rate

CD:

Chalkiness degree

CMS:

Cytoplasmic male sterility

CS:

Chalkiness size

EPN:

Effective panicle number

FGN:

Filled grain number per panicle

GC:

Gel consistency

HRR:

Head rice rate

LWR:

Length-width ratio

WRR:

White rice rate

PaT:

Pasting temperature

PGWC:

Percentage of grains with chalkiness

PH:

Plant height

PL:

Panicle length

PKV:

Peak viscosity

P/TMS:

Photoperiod/Temperature sensitive genic male sterility

RVA:

Rice starch viscosity characteristic analysis

SS:

Seed setting rate

TCW:

Thermal Cycle for Windows

TGN:

Total grain number per panicle

TGW:

1000-grain weight

YP:

Yield per plant

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Funding

This study was financially supported by the National Key Research and Development Program of China (2016YFD0101104), Major project of Jiangxi Provincial Department of Science and Technology (S2016NYZPF0256).

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Correspondence to Xiaosong Peng.

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The authors declared that they have no conflicts of interest to this work. We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted.

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Key Message

Based on agronomic traits, SSR primer screening and second-generation resequencing was conducted to study the genetic basis of Yazhan. Genetic basis revealed that the chromosomes 1, 5, and 6 had the most variation in the genome of Yazhan. Yazhan was more similar to the male parent (Huazhan) in genomic similarity. Yazhan and Huazhan carried the Wxb genotype and the Pita blast resistance gene, while Zhanhui 15 carried the Wxa genotype and the Pita susceptibility gene.

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Li, S., Yu, Q., Sun, Y. et al. Genetic Analysis of Rice Restorer Line Yazhan. Plant Mol Biol Rep 38, 394–403 (2020). https://doi.org/10.1007/s11105-020-01201-6

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