文献类型： 外文期刊

作者： Liu, Nannan ¹ ; Du, Yuanhao ¹ ; Yan, Shijuan ³ ; Chen, Wei ¹ ; Deng, Min ⁴ ; Xu, Shutu ⁵ ; Wang, Hong ⁶ ; Zhan, Wei ⁷ ; Huang, Wenjie ³ ; Yin, Yan ⁸ ; Yang, Xiaohong ⁹ ; Zhao, Qiao ¹⁰ ; Fernie, Alisdair R. ¹¹ ; Yan, Jianbing ¹ ;

作者机构： 1.Huazhong Agr Univ, Natl Key Lab Crop Genet Improvement, Wuhan 430070, Peoples R China

2.Hubei Hongshan Lab, Wuhan 430070, Peoples R China

3.Guangdong Acad Agr Sci, Agrobiol Gene Res Ctr, Guangzhou 510640, Peoples R China

4.Hunan Agr Univ, Coll Agron, Changsha 410128, Peoples R China

5.Northwest A&F Univ, Coll Agron, Xian 710000, Peoples R China

6.Hebei Agr Univ, Coll Agron, Hebei Sub Ctr Natl Maize Improvement Ctr China, State Key Lab North China Crop Improvement & Regul, Baoding 071001, Peoples R China

7.South Cent Minzu Univ, Coll Life Sci, Wuhan 430070, Peoples R China

8.Chinese Acad Sci, Inst Bot, Plant Sci Facil, Beijing 100093, Peoples R China

9.China Agr Univ, Natl Maize Improvement Ctr China, Beijing Key Lab Crop Genet Improvement, Beijing 100193, Peoples R China

10.Chinese Acad Sci, Shenzhen Inst Synthet Biol, Shenzhen Inst Adv Technol, Shenzhen Key Lab Synthet Genom,Guangdong Prov Key, Shenzhen 518055, Peoples R China

11.Max Planck Inst Mol Plant Physiol, D-14476 Potsdam, Germany

关键词： maize; tocopherol; hypoxia; photosynthesis; ZmPORB1

期刊名称：SCIENCE CHINA-LIFE SCIENCES （ 影响因子：9.1； 五年影响因子：7.1 ）

ISSN： 1674-7305

年卷期： 2024 年 67 卷 3 期

页码：

收录情况： SCI

摘要： Tocopherol is an important lipid-soluble antioxidant beneficial for both human health and plant growth. Here, we fine mapped a major QTL-qVE1 affecting gamma-tocopherol content in maize kernel, positionally cloned and confirmed the underlying gene ZmPORB1 (por1), as a protochlorophyllide oxidoreductase. A 13.7 kb insertion reduced the tocopherol and chlorophyll content, and the photosynthetic activity by repressing ZmPORB1 expression in embryos of NIL-K22, but did not affect the levels of the tocopherol precursors HGA (homogentisic acid) and PMP (phytyl monophosphate). Furthermore, ZmPORB1 is inducible by low oxygen and light, thereby involved in the hypoxia response in developing embryos. Concurrent with natural hypoxia in embryos, the redox state has been changed with NO increasing and H2O2 decreasing, which lowered gamma-tocopherol content via scavenging reactive nitrogen species. In conclusion, we proposed that the lower light-harvesting chlorophyll content weakened embryo photosynthesis, leading to fewer oxygen supplies and consequently diverse hypoxic responses including an elevated gamma-tocopherol consumption. Our findings shed light on the mechanism for fine-tuning endogenous oxygen concentration in the maize embryo through a novel feedback pathway involving the light and low oxygen regulation of ZmPORB1 expression and chlorophyll content.