School of Biology & Basic Medical Sciences, Medical College, Soochow University, Suzhou 215123, China.
School of Computer Science and Technology, Soochow University, Suzhou 215006, China.
Genes (Basel). 2020 Oct 15;11(10):1204. doi: 10.3390/genes11101204.
Ascorbate peroxidase (APX) is an important antioxidant enzyme. APXs in maize are encoded by multiple genes and exist as isoenzymes. The evolutionary history and functional divergence of the maize gene family were analyzed through comparative genomic and experimental data on the Internet in this paper. genes in higher plants were divided into classes A, B, and C. Each type of gene in angiosperms only had one ancestral gene that was duplicated along with the genome duplication or local (or tandem) duplication of the angiosperm. A total of eight genes were retained in maize and named , , , , , and The genes of class A were located in the chloroplasts or mitochondria, and the class B and C genes were localized in the peroxisomes and cytoplasm, respectively. The expression patterns of eight were different in vegetative and reproductive organs at different growth and development stages. APXa1 and APXb1 of maize may participate in the antioxidant metabolism of vegetative organs under normal conditions. APXa2, APXb2, APXc1.1, and APXc1.2 may be involved in the stress response, and APXb2 and APXc2 may participate in the senescence response. These results provide a basis for cultivating high-yield and resistant maize varieties.
抗坏血酸过氧化物酶（APX）是一种重要的抗氧化酶。玉米中的 APX 由多个基因编码，并存在同工酶。本文通过比较基因组学和互联网上的实验数据，分析了玉米 基因家族的进化历史和功能分化。高等植物中的 基因分为 A、B 和 C 三类。被子植物每一种类型的 基因只有一个祖先基因，随着基因组加倍或被子植物的局部（或串联）加倍而复制。玉米共保留了 8 个基因，分别命名为 、 、 、 、 、 、 。A 类基因定位于叶绿体或线粒体，B 类和 C 类基因分别定位于过氧化物酶体和细胞质。8 个 基因在不同生长发育阶段的营养器官和生殖器官中的表达模式不同。玉米的 APXa1 和 APXb1 可能参与正常条件下营养器官的抗氧化代谢。APXa2、APXb2、APXc1.1 和 APXc1.2 可能参与应激反应，APXb2 和 APXc2 可能参与衰老反应。这些结果为培育高产和抗性玉米品种提供了依据。
