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Comparative Field Evaluation and Transcriptome Analysis Reveals that Chromosome Doubling Enhances Sheath Blight Resistance in Rice

文献类型： 外文期刊

作者： Liu, Sanglin 1 ; Liu, Jiahao 1 ; Wang, Wei 1 ; Yan, Yugang 1 ; Wang, Tianya 1 ; Wu, Jinwen 1 ; Liu, Xiangdong 1 ; Wu, Jian 1 ; Zeng, Yuxiang 4 ;

作者机构： 1.South China Agr Univ, State Key Lab Conservat & Utilizat Subtrop Agro Bi, Guangzhou 510642, Peoples R China

2.South China Agr Univ, Guangdong Lab Lingnan Modern Agr, Guangzhou 510642, Peoples R China

3.Shaoguan Univ, Sch Biol & Agr, Guangdong Prov Key Lab Utilizat & Conservat Food &, Shaoguan 512005, Peoples R China

4.China Natl Rice Res Inst, State Key Lab Rice Biol & Breeding, Hangzhou 310006, Peoples R China

5.South China Agr Univ, Coll Agr, Guangdong Prov Key Lab Plant Mol Breeding, Guangzhou 510642, Peoples R China

关键词： Rice; Autotetraploid; Sheath blight resistance; Transcriptome

期刊名称：RICE （ 影响因子：4.8； 五年影响因子：5.4 ）

ISSN： 1939-8425

年卷期： 2024 年 17 卷 1 期

页码：

收录情况： SCI

摘要： Rice sheath blight, caused by Rhizoctonia solani Kihn (R. solani), poses a significant threat to rice production and quality. Autotetraploid rice, developed through chromosome doubling of diploid rice, holds great potential for enhancing biological and yield traits. However, its resistance to sheath blight in the field has remained unclear. In this study, the field resistance of 35 autotetraploid genotypes and corresponding diploids was evaluated across three environments from 2020 to 2021. The booting stage was optimal for inoculating period based on the inoculation and analysis of R. solani at five rice growth stages. We found autotetraploids generally exhibited lower disease scores than diploids, indicating enhanced resistance after chromosome doubling. Among the 35 genotypes, 16 (45.71%) displayed increased resistance, 2 (5.71%) showed decreased resistance, and 17 (48.57%) displayed unstable resistance in different sowing dates. All combinations of the genotype, environment and ploidy, including the genotype-environment-ploidy interaction, contributed significantly to field resistance. Chromosome doubling increased sheath blight resistance in most genotypes, but was also dependent on the genotype-environment interaction. To elucidate the enhanced resistance mechanism, RNA-seq revealed autotetraploid recruited more down-regulated differentially expressed genes (DEGs), additionally, more resistance-related DEGs, were down-regulated at 24 h post inoculation in autotetraploid versus diploid. The ubiquinone/terpenoid quinone and diterpenoid biosynthesis pathways may play key roles in ploidy-specific resistance mechanisms. In summary, our findings shed light on the understanding of sheath blight resistance mechanisms in autotetraploid rice.

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