A transposon insertion in the promoter of OsUBC12 enhances cold tolerance during japonica rice germination
文献类型: 外文期刊
第一作者: Zhang, Chuanzhong
作者: Zhang, Chuanzhong;Tian, Xiaojie;Lin, Xinyan;Han, Yunfei;Han, Zhongmin;Sha, Hanjing;Liu, Jia;Bu, Qingyun;Fang, Jun;Zhang, Chuanzhong;Wang, Hongru;Lin, Xinyan;Liu, Jianfeng;Zhang, Jian;Fang, Jun
作者机构: Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Soybean Mol Design Breeding, State Key Lab Black Soils Conservat & Utilizat, Harbin 150081, Peoples R China;Northeast Agr Univ, Key Lab Germplasm Enhancement Physiol & Ecol Food, Minist Educ, Harbin 150030, Peoples R China;Chinese Acad Agr Sci, Agr Genom Inst Shenzhen, Shenzhen Branch, Guangdong Lab Lingnan Modern Agr,Key Lab Synthet B, Shenzhen, Peoples R China;Jilin Normal Univ, Jilin Prov Key Lab Plant Resource Sci & Green Prod, Siping 136000, Jilin, Peoples R China;China Natl Rice Res Inst, State Key Lab Rice Biol, Hangzhou 311400, Peoples R China;Yazhouwan Natl Lab, Sanya 572024, Peoples R China
期刊名称:NATURE COMMUNICATIONS ( 2022影响因子:16.6; 五年影响因子:17.0 )
年卷期: 2024 年 15 卷 1 期
收录情况: SCI
摘要: Low-temperature germination (LTG) is an important agronomic trait for rice (Oryza sativa). Japonica rice generally has greater capacity for germination at low temperatures than the indica subpopulation. However, the genetic basis and molecular mechanisms underlying this complex trait are poorly understood. Here, we report that OsUBC12, encoding an E2 ubiquitin-conjugating enzyme, increases low-temperature germinability in japonica, owing to a transposon insertion in its promoter enhancing its expression. Natural variation analysis reveals that transposon insertion in the OsUBC12 promoter mainly occurs in the japonica lineage. The variation detected in eight representative two-line male sterile lines suggests the existence of this allele introgression by indica-japonica hybridization breeding, and varieties carrying the japonica OsUBC12 locus (transposon insertion) have higher low-temperature germinability than varieties without the locus. Further molecular analysis shows that OsUBC12 negatively regulate ABA signaling. OsUBC12-regulated seed germination and ABA signaling mainly depend on a conserved active site required for ubiquitin-conjugating enzyme activity. Furthermore, OsUBC12 directly associates with rice SUCROSE NON-FERMENTING 1-RELATED PROTEIN KINASE 1.1 (OsSnRK1.1), promoting its degradation. OsSnRK1.1 inhibits LTG by enhancing ABA signaling and acts downstream of OsUBC12. These findings shed light on the underlying mechanisms of UBC12 regulating LTG and provide genetic reference points for improving LTG in indica rice.
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