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The chimeric mitochondrial gene orf182 causes non‐pollen‐type abortion in Dongxiang cytoplasmic male‐sterile rice
Author(s) -
Xie Hongwei,
Peng Xiaojue,
Qian Mingjuan,
Cai Yicong,
Ding Xia,
Chen Qiusheng,
Cai Qiying,
Zhu Youlin,
Yan Longan,
Cai Yaohui
Publication year - 2018
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/tpj.13982
Subject(s) - biology , cytoplasmic male sterility , chimeric gene , sterility , gene , mitochondrial dna , pollen , mitochondrion , nuclear gene , genetics , microbiology and biotechnology , gene expression , botany
Summary D1‐cytoplasmic male sterility ( CMS ) rice is a sporophytic cytoplasmic male‐sterile rice developed from Dongxiang wild rice that exhibits a no‐pollen‐grain phenotype. A mitochondrial chimeric gene ( orf182 ) was detected by mitochondrial genome sequencing and a comparative analysis. Orf182 is composed of three recombinant fragments, the largest of which is homologous to Sorghum bicolor mitochondrial sequences. In addition, orf182 was found only in wild rice species collected from China. Northern blot analysis showed that orf182 transcripts were affected by Rf genes in the isocytoplasmic restorer line DR 7. Western blot analysis showed that the ORF 182 product was localized in the mitochondria of the CMS line. An expression cassette containing orf182 fused to a mitochondrial transit peptide induced the maintainer line of male sterility, which lacked pollen grains in the anthers. Furthermore, the in vivo expression of orf182 also inhibited the growth of Escherichia coli , with lower respiration rate, excess accumulation of reactive oxygen species and decreased ATP levels. We conclude that the mitochondrial chimeric gene orf182 possesses a unique structure and origin differing from other identified mitochondrial CMS genes, and this gene is connected to non‐pollen type of sporophytic male sterility in D1‐ CMS rice.