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Ren W, Si J, Chen L, Fang Z, Zhuang M, Lv H, Wang Y, Ji J, Yu H, Zhang Y. Mechanism and Utilization of Ogura Cytoplasmic Male Sterility in Cruciferae Crops. Int J Mol Sci 2022; 23:ijms23169099. [PMID: 36012365 PMCID: PMC9409259 DOI: 10.3390/ijms23169099] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 08/05/2022] [Accepted: 08/09/2022] [Indexed: 12/11/2022] Open
Abstract
Hybrid production using lines with cytoplasmic male sterility (CMS) has become an important way to utilize heterosis in vegetables. Ogura CMS, with the advantages of complete pollen abortion, ease of transfer and a progeny sterility rate reaching 100%, is widely used in cruciferous crop breeding. The mapping, cloning, mechanism and application of Ogura CMS and fertility restorer genes in Brassica napus, Brassica rapa, Brassica oleracea and other cruciferous crops are reviewed herein, and the existing problems and future research directions in the application of Ogura CMS are discussed.
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Affiliation(s)
- Wenjing Ren
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture, Beijing 100081, China
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Jinchao Si
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture, Beijing 100081, China
| | - Li Chen
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture, Beijing 100081, China
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Zhiyuan Fang
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture, Beijing 100081, China
| | - Mu Zhuang
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture, Beijing 100081, China
| | - Honghao Lv
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture, Beijing 100081, China
| | - Yong Wang
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture, Beijing 100081, China
| | - Jialei Ji
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture, Beijing 100081, China
| | - Hailong Yu
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture, Beijing 100081, China
- Correspondence: (H.Y.); (Y.Z.)
| | - Yangyong Zhang
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture, Beijing 100081, China
- Correspondence: (H.Y.); (Y.Z.)
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Zhang W, Shi H, Zhou Y, Liang X, Luo X, Xiao C, Li Y, Xu P, Wang J, Gong W, Zou Q, Tao L, Kang Z, Tang R, Li Z, Yang J, Fu S. Rapid and Synchronous Breeding of Cytoplasmic Male Sterile and Maintainer Line Through Mitochondrial DNA Rearrangement Using Doubled Haploid Inducer in Brassica napus. FRONTIERS IN PLANT SCIENCE 2022; 13:871006. [PMID: 35557722 PMCID: PMC9087798 DOI: 10.3389/fpls.2022.871006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 03/28/2022] [Indexed: 05/31/2023]
Abstract
When homozygously fertile plants were induced using doubled haploid (DH) induction lines Y3380 and Y3560, the morphology of the induced F1 generation was basically consistent with the female parent, but the fertility was separated, showing characteristics similar to cytoplasmic male sterile (CMS) and maintainer lines. In this study, the morphology, fertility, ploidy, and cytoplasm genotype of the induced progeny were identified, and the results showed that the sterile progeny was polima cytoplasm sterile (pol CMS) and the fertile progeny was nap cytoplasm. The molecular marker and test-cross experimental results showed that the fertile progeny did not carry the restorer gene of pol CMS and the genetic distance between the female parent and the offspring was 0.002. This suggested that those inductions which produced sterile and fertile progeny were coordinated to CMS and maintainer lines. Through the co-linearity analysis of the mitochondrial DNA (mtDNA), it was found that the rearrangement of mtDNA by DH induction was the key factor that caused the transformation of fertility (nap) into sterility (pol). Also, when heterozygous females were induced with DH induction lines, the induction F2 generation also showed the segregation of fertile and sterile lines, and the genetic distance between sterile and fertile lines was approximately 0.075. Therefore, the induction line can induce different types of female parents, and the breeding of the sterile line and the maintainer line can be achieved through the rapid synchronization of sister crosses and self-crosses. The induction of DH inducer in B. napus can provide a new model for the innovation of germplasm resources and open up a new way for its application.
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Affiliation(s)
- Wei Zhang
- Chengdu Academy of Agricultural and Forestry Sciences, Chengdu, China
- Chengdu Research Branch, National Rapeseed Genetic Improvement Center, Chengdu, China
- Agricultural College, Sichuan Agricultural University, Chengdu, China
| | - Haoran Shi
- Chengdu Academy of Agricultural and Forestry Sciences, Chengdu, China
- Chengdu Research Branch, National Rapeseed Genetic Improvement Center, Chengdu, China
| | - Ying Zhou
- Chengdu Academy of Agricultural and Forestry Sciences, Chengdu, China
- Chengdu Research Branch, National Rapeseed Genetic Improvement Center, Chengdu, China
- Agricultural College, Sichuan Agricultural University, Chengdu, China
| | - Xingyu Liang
- Chengdu Academy of Agricultural and Forestry Sciences, Chengdu, China
- Chengdu Research Branch, National Rapeseed Genetic Improvement Center, Chengdu, China
- Maize Research Institute, Sichuan Agricultural University, Chengdu, China
| | - Xuan Luo
- Chengdu Academy of Agricultural and Forestry Sciences, Chengdu, China
- Chengdu Research Branch, National Rapeseed Genetic Improvement Center, Chengdu, China
- Maize Research Institute, Sichuan Agricultural University, Chengdu, China
| | - Chaowen Xiao
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
| | - Yun Li
- Chengdu Academy of Agricultural and Forestry Sciences, Chengdu, China
- Chengdu Research Branch, National Rapeseed Genetic Improvement Center, Chengdu, China
| | - Peizhou Xu
- Rice Research Institute, Sichuan Agricultural University, Chengdu, China
| | - Jisheng Wang
- Chengdu Academy of Agricultural and Forestry Sciences, Chengdu, China
- Chengdu Research Branch, National Rapeseed Genetic Improvement Center, Chengdu, China
| | - Wanzhuo Gong
- Chengdu Academy of Agricultural and Forestry Sciences, Chengdu, China
- Chengdu Research Branch, National Rapeseed Genetic Improvement Center, Chengdu, China
| | - Qiong Zou
- Chengdu Academy of Agricultural and Forestry Sciences, Chengdu, China
- Chengdu Research Branch, National Rapeseed Genetic Improvement Center, Chengdu, China
| | - Lanrong Tao
- Chengdu Academy of Agricultural and Forestry Sciences, Chengdu, China
- Chengdu Research Branch, National Rapeseed Genetic Improvement Center, Chengdu, China
| | - Zeming Kang
- Chengdu Academy of Agricultural and Forestry Sciences, Chengdu, China
- Chengdu Research Branch, National Rapeseed Genetic Improvement Center, Chengdu, China
| | - Rong Tang
- Chengdu Academy of Agricultural and Forestry Sciences, Chengdu, China
- Chengdu Research Branch, National Rapeseed Genetic Improvement Center, Chengdu, China
| | - Zhuang Li
- Agricultural College, Sichuan Agricultural University, Chengdu, China
| | - Jin Yang
- Chengdu Academy of Agricultural and Forestry Sciences, Chengdu, China
- Chengdu Research Branch, National Rapeseed Genetic Improvement Center, Chengdu, China
| | - Shaohong Fu
- Chengdu Academy of Agricultural and Forestry Sciences, Chengdu, China
- Chengdu Research Branch, National Rapeseed Genetic Improvement Center, Chengdu, China
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Liu Z, Yang Z, Wang X, Li K, An H, Liu J, Yang G, Fu T, Yi B, Hong D. A Mitochondria-Targeted PPR Protein Restores pol Cytoplasmic Male Sterility by Reducing orf224 Transcript Levels in Oilseed Rape. MOLECULAR PLANT 2016; 9:1082-4. [PMID: 27102212 DOI: 10.1016/j.molp.2016.04.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 03/29/2016] [Accepted: 04/07/2016] [Indexed: 05/20/2023]
Affiliation(s)
- Zhi Liu
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, P.R. China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, P.R. China
| | - Zonghui Yang
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, P.R. China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, P.R. China
| | - Xiang Wang
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, P.R. China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, P.R. China
| | - Kaidi Li
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, P.R. China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, P.R. China
| | - Hong An
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, P.R. China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, P.R. China
| | - Jie Liu
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, P.R. China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, P.R. China
| | - Guangsheng Yang
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, P.R. China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, P.R. China
| | - Tingdong Fu
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, P.R. China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, P.R. China
| | - Bin Yi
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, P.R. China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, P.R. China.
| | - Dengfeng Hong
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, P.R. China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, P.R. China.
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Carlsson J, Leino M, Sohlberg J, Sundström JF, Glimelius K. Mitochondrial regulation of flower development. Mitochondrion 2008; 8:74-86. [PMID: 18054525 DOI: 10.1016/j.mito.2007.09.006] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2007] [Revised: 08/27/2007] [Accepted: 09/02/2007] [Indexed: 11/19/2022]
Abstract
Flower development in plants depends not only on a set of nuclear genes but also on the coordinate action of the mitochondrion. Certain mitochondrial genomes in combination with certain nuclear genomes lead to the expression of cytoplasmic male-sterility (CMS). Both mitochondrial genes that determine male-sterility and nuclear Restorer-of-fertility genes that suppress the male-sterile phenotype have been cloned. Lately, the interactions between mitochondrial and nuclear genes through retrograde signalling in CMS-systems have been dissected. Of special interest are the altered expression patterns of floral homeotic genes in certain CMS-systems. Here, we review the mitochondrial influence on flower development and give examples from CMS-systems developed in Brassica, Daucus carota, Nicotiana tabacum and Triticum aestivum.
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Affiliation(s)
- Jenny Carlsson
- Department of Plant Biology and Forest Genetics, Swedish University of Agricultural Sciences, Uppsala, Sweden
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Wei W, Wang H, Liu G. Transcriptional Regulation of 10 Mitochondrial Genes in Different Tissues of NCa CMS System in Brassica napus L. and Their Relationship with Sterility. J Genet Genomics 2007; 34:72-80. [PMID: 17469779 DOI: 10.1016/s1673-8527(07)60008-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2006] [Accepted: 06/13/2006] [Indexed: 11/28/2022]
Abstract
Northern blot analysis was conducted with mitochondrial RNA from seedling leaves, floral buds, and developing seeds of NCa CMS, maintainer line and fertile F(1) using ten mitochondrial genes as probes. The results revealed that 9 out of the 10 mitochondrial genes, except for atp6, showed no difference in different tissues of the corresponding materials of NCa CMS system and that they might be constitutively expressed genes. Eight genes, such as orf139, orf222, atp1, cox1, cox2, cob, rrn5S, and rrn26S, showed no difference among the three tissues of all the materials detected. So the expression of these eight genes was not regulated by nuclear genes and was not tissue-specific. The transcripts of atp9 were identical among different tissues, but diverse among different materials, indicating that transcription of atp9 was neither controlled by nuclear gene nor tissue-specific. Gene atp6 displayed similar transcripts with the same size among different tissues of all the materials but differed in abundance among tissues of corresponding materials and its expression might be tissue-specific under regulation of nuclear gene. Moreover, three transcripts of orf222 were detected in the floral buds of NCa cms and fertile F(1), but no transcript was detected in floral buds of the maintainer line. The transcription of orf139 was similar to that of orf222 but only two transcripts of 0.8 kb and 0.6 kb were produced. The atp9 probe detected a single transcript of 0.6 kb in NCa cms and in maintainer line and an additional transcript of 1.2 kb in fertile F(1). The relationship of expression of orf222, orf139, and atp9 with NCa sterility was discussed.
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Affiliation(s)
- Wenliang Wei
- Key Lab for Genetics and Improvement of Oil Crops, Ministry of Agriculture, Oil Crops Research Institute, CAAS, Wuhan 430062, China
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6
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Formanová N, Li XQ, Ferrie AMR, Depauw M, Keller WA, Landry B, Brown GG. Towards positional cloning in Brassica napus: generation and analysis of doubled haploid B. rapa possessing the B. napus pol CMS and Rfp nuclear restorer gene. PLANT MOLECULAR BIOLOGY 2006; 61:269-81. [PMID: 16786306 DOI: 10.1007/s11103-006-0008-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2005] [Accepted: 01/06/2006] [Indexed: 05/10/2023]
Abstract
The Polima (pol) system of cytoplasmic male sterility (CMS) and its fertility restorer gene Rfp are used in hybrid rapeseed production in Brassica napus. To facilitate map-based cloning of the Rfp gene, we have successfully transferred the pol cytoplasm and Rfp from the amphidiploid B. napus to the diploid species B. rapa and generated a doubled haploid pol cytoplasm B. rapa population that segregates for the Rfp gene. This was achieved through interspecific crosses, in vitro rescue of hybrid embryos, backcrosses, and microspore culture. Male fertility conditioned by Rfp was shown to co-segregate in this population with Rfp-specific mitochondrial transcript modifications and with DNA markers previously shown to be linked to Rfp in B. napus. The selfed-progeny of one doubled haploid plant were confirmed to be characteristic B. rapa diploids by cytogenetic analysis. Clones recovered from a genomic library derived from this plant line using the RFLP probe cRF1 fell into several distinct physical contigs, one of which contained Rfp-linked polymorphic restriction fragments detected by this probe. This indicates that chromosomal DNA segments anchored in the Rfp region can be recovered from this library and that the library may therefore prove to be a useful resource for the eventual isolation of the Rfp gene.
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Affiliation(s)
- Natasa Formanová
- Department of Biology, McGill University, Montreal, Quebec, Canada
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Kempken F, Pring D. Plant Breeding: Male Sterility in Higher Plants - Fundamentals and Applications. ACTA ACUST UNITED AC 1999. [DOI: 10.1007/978-3-642-59940-8_6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
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9
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Li XQ, Jean M, Landry BS, Brown GG. Restorer genes for different forms of Brassica cytoplasmic male sterility map to a single nuclear locus that modifies transcripts of several mitochondrial genes. Proc Natl Acad Sci U S A 1998; 95:10032-7. [PMID: 9707595 PMCID: PMC21456 DOI: 10.1073/pnas.95.17.10032] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The oilseed rape plant, Brassica napus, possesses two endogenous male sterile cytoplasms, nap and pol. Previous studies have shown that nuclear restoration of pol cytoplasmic male sterility (CMS) is conditioned by a gene, Rfp, that is also involved in modifying transcripts of the pol CMS-associated orf224/atp6 mtDNA region. We now find that the nap nuclear restorer gene Rfn apparently is identical to Mmt, a gene that conditions the modification of transcripts from several different mtDNA regions, including one that is associated with nap CMS and contains orf222, a chimeric gene related to orf224. Mmt, in turn, is found to be allelic to Rfp, suggesting that restorer genes for the two cytoplasms represent different alleles or haplotypes of a single nuclear locus. This view is supported by restriction fragment length polymorphism mapping studies that indicate that Rfn and Rfp map to the same chromosomal position. Thus, in contrast to CMS in other species, different forms of Brassica CMS are restored by alleles of a single nuclear locus, and the restoration properties of these alleles reflect their involvement in the modification of transcripts of corresponding CMS-associated mtDNA regions. A survey of 51 varieties from 8 Brassica and Sinapis species failed to find evidence of Rfn(Mmt) in other than fertility-restored, nap cytoplasm B. napus. This suggests that Rfn(Mmt) arose in Brassica with nap cytoplasm and that the necessity for fertility restoration may have provided the selective pressure for its origin and maintenance.
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Affiliation(s)
- X Q Li
- Department of Biology, McGill University, Montreal, Quebec H3A 1B1, Canada
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Albaum M, Lührs R, Trautner J, Abel WO. The Tokumasu radish mitochondrial genome contains two complete atp9 reading frames. PLANT MOLECULAR BIOLOGY 1995; 29:179-185. [PMID: 7579164 DOI: 10.1007/bf00019130] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Two copies of the gene atp9, encoding subunit 9 of the mitochondrial F1F0-ATPase, have been cloned from the Tokumasu radish (Raphanus sativus L.) cytoplasm. The genomic DNA and the corresponding cDNA sequences of the coding regions were determined. Both alleles contain a 222 bp long and well conserved atp9 reading frame, coding for a 74 amino acid polypeptide. The Tokumasu atp9-1 gene may have a unique N-terminal extension of 11 amino acid residue relative to other plant atp9 genes. In comparison of cDNA and genomic sequences four RNA editing events were found in both atp9 genes. Northern experiments indicate different transcription patterns for the two genes.
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Affiliation(s)
- M Albaum
- Institut für Allgemeine Botanik, Universität Hamburg, Germany
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11
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Singh M, Brown GG. Characterization of expression of a mitochondrial gene region associated with the Brassica "Polima" CMS: developmental influences. Curr Genet 1993; 24:316-22. [PMID: 8252642 DOI: 10.1007/bf00336783] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The mitochondrial genome of the Polima (pol) male-sterile cytoplasm of Brassica napus contains a chimeric 224-codon open reading frame (orf224) that is located upstream of, and co-transcribed with, the atp6 gene. The N-terminal coding region of orf224 is derived from a conventional mitochondrial gene, orfB, while the origin of the remainder of the sequence is unknown. We show that an apparently functional copy of orfB is present in the pol mitochondrial genome, indicating that the pol CMS is not caused by the absence of an intact, expressed orfB gene. The 5' termini of orf224/atp6 transcripts present in both sterile and fertility-restored (Rf) pol cytoplasm plants are shown to map to sequences resembling mitochondrial transcription-initiation sites, whereas the 5' termini of two transcripts specific to restored lines map to sequences which resemble neither one another nor mitochondrial promoter motifs. It is suggested that the complex orf224/atp6 transcript pattern of Rf plants is generated by a combination of multiple transcription initiation and processing events and that the nuclear restorer gene acts to specifically alter orf224/atp6 transcripts by affecting RNA processing. Northern analyses demonstrate that the effect of the restorer gene on orf224/atp6 transcripts is not tissue or developmental-stage specific. However, the expression of the atp6 region is developmentally regulated in pol plants, resulting in decreased levels of monocistronic atp6 transcripts in floral tissue relative to seedlings. It is suggested that this developmental regulation may be related to the absence of overt phenotypic effects of the CMS mutation in vegetative tissues.
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Affiliation(s)
- M Singh
- Department of Biology, McGill University, Montreal, Quebec, Canada
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13
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Krishnasamy S, Makaroff CA. Characterization of the radish mitochondrial orfB locus: possible relationship with male sterility in Ogura radish. Curr Genet 1993; 24:156-63. [PMID: 8358822 DOI: 10.1007/bf00324680] [Citation(s) in RCA: 77] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The orfB locus of the normal (fertile) and Ogura (male-sterile) radish mitochondrial genomes has been characterized in order to determine if this region, which has previously been correlated with cytoplasmic male sterility (CMS) in Brassica napus cybrids (Bonhomme et al. 1991; Temple et al. 1992), could also be involved in radish CMS. In normal radish, orfB is expressed as a 600-nucleotide (nt) transcript. In Ogura radish, orfB is present as the second gene of a 1200-nt transcript that also contains a 138-codon open reading frame (orf138). Sequences showing similarity to orf138 are present in normal radish, but are not expressed.
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Affiliation(s)
- S Krishnasamy
- Department of Chemistry, Miami University, Oxford, OH 45056
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14
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Handa H, Nakajima K. Different organization and altered transcription of the mitochondrial atp6 gene in the male-sterile cytoplasm of rapeseed (Brassica napus L.). Curr Genet 1992; 21:153-9. [PMID: 1533177 DOI: 10.1007/bf00318475] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The Fo-ATPase subunit 6 gene (atp6) of rapeseed mitochondria has been isolated from both pol male-sterile and normal (fertile) cytoplasms in order to determine whether the rearrangements around the atp6 locus in pol male-sterile cytoplasm play a role in cytoplasmic male-sterility (cms). The pol cms and normal atp6 genes are identical and encode a 261-amino acid polypeptide. As a result of extensive rearrangement, a novel reading frame (pol-urf) was generated upstream of the atp6 gene only in pol cms mitochondria, which encoded 105 amino acids and might be co-transcribed with atp6. A 5'-portion of pol-urf shows sequence homology to the Oenothera ORFB gene associated with coxIII. A 5'-flanking region of the pol-urf also shows homology to that of ORF105 in Ogura cms radish mitochondria. These DNA rearrangements which give rise to pol-urf in the vicinity of the atp6 locus may be responsible for cms in rapeseed.
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Affiliation(s)
- H Handa
- Department of Cell Biology, National Institute of Agrobiological Resources, Tsukuba Science City, Japan
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