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Overexpression of the rice ORANGE gene OsOR negatively regulates carotenoid accumulation, leads to higher tiller numbers and decreases stress tolerance in Nipponbare rice

文献类型： 外文期刊

作者： Yu, Yang 1 ; Yu, Jiyang 1 ; Wang, Qinglong 4 ; Wang, Jing 1 ; Zhao, Guangxin 1 ; Wu, Hongkai 5 ; Zhu, Yanming 3 ; Chu, Ch 1 ;

作者机构： 1.Northeast Inst Geog & Agroecol, Chinese Acad Sci, Innovat Acad Seed Design, Key Lab Soybean Mol Design Breeding, Harbin, Peoples R China

2.Shenyang Univ, Coll Life Sci & Engn, Shenyang, Peoples R China

3.Northeast Agr Univ, Key Lab Agr Biol Funct Genes, Harbin, Peoples R China

4.Inst Plant Physiol Ecol, Chinese Acad Sci, Natl Key Lab Plant Mol Genet, Shanghai, Peoples R China

5.Zhejiang A&F Univ, Coll Agr & Food Sci, Hangzhou, Peoples R China

6.Inst Genet & Dev Biol, Chinese Acad Sci, Innovat Acad Seed Design, State Key Lab Plant Genom, Beijing, Peoples R China

7.Univ Chinese Acad Sci, Coll Adv Agr Sci, Beijing, Peoples R China

8.Qual & Safety Inst Agr Prod, Heilongjiang Acad Agr Sci, Harbin, Peoples R China

关键词： Orange gene; Carotenoid; Strigolactone; Tiller number; Abiotic stress

期刊名称：PLANT SCIENCE （ 影响因子：4.729； 五年影响因子：5.132 ）

ISSN： 0168-9452

年卷期： 2021 年 310 卷

页码：

收录情况： SCI

摘要： The ORANGE (OR) gene has been reported to regulate chromoplast differentiation and enhance carotenoid biosynthesis in many dicotyledonous plants. However, the function of the OR gene in monocotyledons, especially rice, is poorly known. Here, the OR gene from rice, OsOR, was isolated and characterized by generating overexpressing and genome editing mutant lines. The OsOR-overexpressing plants exhibited pleiotropic phenotypes, such as alternating transverse green and white sectors on leaves at the early tillering stage, that were due to changes in thylakoid development and reduced carotenoid content. In addition, the number of tillers significantly increased in OsOR-overexpressing plants but decreased in osor mutant lines, a result similar to that previously reported for the carotenoid isomerase mutant mit3. The expression of the DWARF3 and DWARF53 genes that are involved in the strigolactone signalling pathway were similarly downregulated in OsOR-overexpressing plants but upregulated in osor mutants. Moreover, the OsOR-overexpressing plants exhibited greater sensitivity to salt and cold stress, and had lower total chlorophyll and higher MDA contents. All results suggest that the OsOR gene plays an important role not only in carotenoid accumulation but also in tiller number regulation and in responses to environmental stress in rice.

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