scholarly journals Identification of Ms2, a novel locus controlling male-fertility restoration of cytoplasmic male-sterility in onion (Allium cepa L.), and development of tightly linked molecular markers

Euphytica ◽  
2021 ◽  
Vol 217 (10) ◽  
Author(s):  
Nari Yu ◽  
Sunggil Kim
Keyword(s):  
Molecular Markers ◽  
Cytoplasmic Male Sterility ◽  
Male Sterility ◽  
Allium Cepa ◽  
Male Fertility ◽  
Fertility Restoration ◽  
Allium Cepa L ◽  
Male Fertility Restoration

scholarly journals Identification of Ms2, a Novel Locus Controlling Male-fertility Restoration of Cytoplasmic Male-sterility in Onion (Allium Cepa L.), and Development of Tightly Linked Molecular Markers

2021 ◽  
Author(s):  
Nari Yu ◽  
Sunggil Kim
Keyword(s):  
Cytoplasmic Male Sterility ◽  
Male Sterility ◽  
Allium Cepa ◽  
Male Fertility ◽  
Bulked Segregant Analysis ◽  
Fertility Restoration ◽  
Chromosome 2 ◽  
Rna Seq ◽  
Male Sterile ◽  
Male Fertility Restoration

Abstract Cytoplasmic male-sterility (CMS) has been exclusively used to produce F1 hybrid seeds of onion (Allium cepa L.). A single nuclear locus, Ms, is known to restore male-fertility of CMS in onions. Unstable male-sterile onions producing a small amount of pollen grains have been identified in a previous study. When such unstable male-sterile onions were crossed with stable male-sterile onions containing CMS-T cytoplasm, male-fertility was completely restored, although genotypes of the Ms locus were homozygous recessive. Inheritance patterns indicated that male-fertility restoration was controlled by a single locus designated as Ms2. A combined approach of bulked segregant analysis and RNA-seq was used to identify candidate genes for the Ms2 locus. High resolution melting (HRM) markers were developed based on single nucleotide polymorphisms (SNPs) detected by RNA-Seq. Comparative mapping of the Ms2 locus showed that Ms2 was positioned at the end of chromosome 2 with a distance of approximately 70 cM away from the Ms locus. Although 38 contigs containing reliable SNPs were analyzed using recombinants selected from 1,344 individuals, no contig showed perfect linkage to Ms2. Interestingly, transcription levels of orf725, a CMS-associated gene in onions, were significantly reduced in male-fertile individuals of segregating populations. However, no significant change in its transcription level was observed in individuals of a segregating population with male-fertility phenotypes determined by the Ms locus, suggesting that male-fertility restoration mechanism of Ms2 might be different from that of the Ms locus.

scholarly journals 069 Molecular-facilitated Selection of Maintainer Lines in Edible Onion (Allium cepa L.)

HortScience ◽  
1999 ◽  
Vol 34 (3) ◽  
pp. 453B-453
Author(s):  
Ali Fuat Gokce ◽  
Michael J. Havey
Keyword(s):  
Molecular Markers ◽  
Male Sterility ◽  
Male Fertility ◽  
Fertility Restoration ◽  
Male Sterile ◽  
Nuclear Markers ◽  
Pcr Marker ◽  
Allium Cepa L ◽  
Male Fertility Restoration ◽  
Selection Of

Cytoplasmic-genic male sterility (CMS) is used to produce hybrid onion seed. For the most widely used source of CMS in onion, male sterility is conditioned by the interaction of sterile (S) cytoplasm and the homozygous recessive genotype at a single nuclear male-fertility restoration locus (Ms). Maintainer lines used to seed-propagate male-sterile lines possess normal fertile (N) cytoplasm and the homozyous recessive genotype at the Ms locus. Presently, it takes 4 to 8 years to establish if maintainer lines can be extracted from an uncharacterized population or family. We previously developed a PCR marker useful to distinguish N and S cytoplasms of onion. To tag the nuclear male-fertility restoration locus (Ms), we evaluated segregation at Ms over at least three environments. Segregations of AFLPs, RAPDs, and RFLPs revealed molecular markers flanking the Ms locus. We are working to convert these linked molecular markers to nonradioactive PCR-based detection. The organellar and nuclear markers were used to select plants from open-pollinated onion populations and determine if the number of test-crosses required to identify maintaining genotypes.

scholarly journals The Dynamics of Gynodioecy in Plantago lanceolatu L. II. Mode of Action and Frequencies of Restorer Alleles

Genetics ◽  
1997 ◽  
Vol 147 (3) ◽  
pp. 1317-1328
Author(s):  
Anita A de Haan ◽  
Hans P Koelewijn ◽  
Maria P J Hundscheid ◽  
Jos M M Van Damme
Keyword(s):  
Cytoplasmic Male Sterility ◽  
Male Sterility ◽  
Allele Frequency ◽  
Mode Of Action ◽  
Male Fertility ◽  
Fertility Restoration ◽  
Plantago Lanceolata ◽  
Allele Frequencies ◽  
Male Sterile ◽  
Male Fertility Restoration

Male fertility in Plantago lanceolata is controlled by the interaction of cytoplasmic and nuclear genes. Different cytoplasmic male sterility (CMS) types can be either male sterile or hermaphrodite, depending on the presence of nuclear restorer alleles. In three CMS types of P. lanceolata (CMSI, CMSIIa, and CMSIIb) the number of loci involved in male fertility restoration was determined. In each CMS type, male fertility was restored by multiple genes with either dominant or recessive action and capable either of restoring male fertility independently or in interaction with each other (epistasis). Restorer allele frequencies for CMSI, CMSIIa and CMSIIb were determined by crossing hermaphrodites with “standard” male steriles. Segregation of male steriles vs. non-male steriles was used to estimate overall restorer allele frequency. The frequency of restorer alleles was different for the CMS types: restorer alleles for CMSI were less frequent than for CMSIIa and CMSIIb. On the basis of the frequencies of male steriles and the CMS types an “expected” restorer allele frequency could be calculated. The correlation between estimated and expected restorer allele frequency was significant.

scholarly journals The Dominant Ms Allele in Onion Shows Reduced Penetrance

2010 ◽  
Vol 135 (1) ◽  
pp. 49-52 ◽  
Author(s):  
Sergio Melgar ◽  
Michael J. Havey
Keyword(s):  
Cytoplasmic Male Sterility ◽  
Male Sterility ◽  
Male Fertility ◽  
Fertility Restoration ◽  
The Other ◽  
Normal Male ◽  
Male Sterile ◽  
Mean Values ◽  
Reduced Penetrance ◽  
Male Fertility Restoration

The most commonly used source of cytoplasmic male sterility in onion (Allium cepa) is controlled by the interaction of the cytoplasm [male-sterile (S) or normal male-fertile (N)] and one nuclear male-fertility-restoration locus (Ms). Scoring of genotypes at Ms is generally done by testcrossing male-fertile to male-sterile (S msms) plants, followed by scoring of testcross progenies for male-fertility restoration. We identified two N-cytoplasmic families, one that was homozygous dominant and the other segregating at Ms. Plants from each of these two families were individually testcrossed to male-sterile onion. Nuclear restoration of male fertility in testcross progenies was evaluated in the field over 4 years. For male plants homozygous dominant at Ms, we expected testcross families to show 100% male-fertility restoration, but observed mean values between 46% and 100%. For plants segregating at Ms, we again observed lower than expected frequencies of male-fertility restoration. These results demonstrate that the dominant Ms allele shows reduced penetrance, requiring that male-fertility restoration be scored over years to more confidently assign genotypes at Ms.

Inheritance of male fertility restoration and allelism of restorer genes for the Polima cytoplasmic male sterility system in oilseed rape

Genome ◽  
1989 ◽  
Vol 32 (6) ◽  
pp. 1044-1047 ◽  
Author(s):  
G. H. Fang ◽  
P. B. E. McVetty
Keyword(s):  
Cytoplasmic Male Sterility ◽  
Male Sterility ◽  
Male Fertility ◽  
Fertility Restoration ◽  
Restorer Gene ◽  
Fertility Restorer ◽  
Brassica Napus L ◽  
Restorer Genes ◽  
Segregation Ratios ◽  
Male Fertility Restoration

The inheritance of male fertility restoration for the pol cytoplasmic male sterility (CMS) system in summer rape (Brassica napus L.) was determined. Male fertility:sterility segregation ratios observed in F2 and backcross generations derived from crosses and backcrosses between two pol CMS A lines and the male fertility restorer gene(s) sources Italy and UM2353 were used in this study. Italy and UM2353 were found to possess a single Mendelian dominant gene with high male fertility restoration capabilities for the pol CMS system. Tests for allelism of the restorer genes were also conducted using male fertility:sterility segregation ratios observed in F3 families derived from crosses between F1 plants containing genes for male fertility restoration from the Italy and UM2353 restorer gene sources. The male fertility restorer gene from Italy (designated Rfp1) was found to be different (i.e., nonallelic) from the restorer gene possessed by UM2353 (designated Rfp2).Key words: Brassica napus L., oilseed rape, male fertility restoration, pol cytoplasmic male sterility.

Genetic analysis of male fertility restoration in wild cytoplasmic male sterility G of beet

2004 ◽  
Vol 109 (1) ◽  
pp. 240-247 ◽  
Author(s):  
Pascal Touzet ◽  
Nathalie Hueber ◽  
Alexandra Bürkholz ◽  
Stephen Barnes ◽  
Joël Cuguen
Keyword(s):  
Genetic Analysis ◽  
Cytoplasmic Male Sterility ◽  
Male Sterility ◽  
Male Fertility ◽  
Fertility Restoration ◽  
Male Fertility Restoration
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