Genetic control of B chromosome transmission in Aegilops speltoides (Poaceae)

1994 ◽  
Vol 81 (11) ◽  
pp. 1502-1507 ◽  
Author(s):  
Antonio Cebria ◽  
Maria Luisa Navarro ◽  
Maria J. Puertas
Keyword(s):  
Genetic Control ◽  
B Chromosome ◽  
Aegilops Speltoides ◽  
Chromosome Transmission

Genetic control of B chromosome transmission in maize and rye

2000 ◽  
pp. 79-92 ◽  
Author(s):  
María J. Puertas ◽  
Guillermo Jiménez ◽  
Silvia Manzanero ◽  
A. Mauricio Chiavarino ◽  
Marcela Rosato ◽  
...  
Keyword(s):  
Genetic Control ◽  
B Chromosome ◽  
Chromosome Transmission

Genetic control of B chromosome transmission rate in Zea mays ssp. mays (Poaceae)

1996 ◽  
Vol 83 (9) ◽  
pp. 1107-1112 ◽  
Author(s):  
Marcela Rosato ◽  
Amilcar M. Chiavarino ◽  
Carlos A. Naranjo ◽  
María J. Puertas ◽  
Lidia Poggio
Keyword(s):  
Zea Mays ◽  
Genetic Control ◽  
Transmission Rate ◽  
B Chromosome ◽  
Chromosome Transmission

scholarly journals Maternal imprinting effect on B chromosome transmission in rye

Heredity ◽  
1990 ◽  
Vol 64 (2) ◽  
pp. 197-204 ◽  
Author(s):  
M J Puertas ◽  
M M Jiménez ◽  
F Romera ◽  
J M Vega ◽  
M Díez
Keyword(s):  
B Chromosome ◽  
Chromosome Transmission ◽  
Maternal Imprinting

Biochemical data bearing on the origin of the B genome in the polyploid wheats

Genome ◽  
1990 ◽  
Vol 33 (3) ◽  
pp. 360-368 ◽  
Author(s):  
K. Kerby ◽  
J. Kuspira ◽  
B. L. Jones ◽  
G. L. Lookhart
Keyword(s):  
Amino Acid ◽  
B Chromosome ◽  
Amino Acid Sequences ◽  
Chromosome 1 ◽  
Aegilops Speltoides ◽  
B Genome ◽  
Aegilops Longissima ◽  
Aegilops Sharonensis ◽  
A Genome ◽  
Genome Donors

For many years each of the species Aegilops bicornis, Aegilops longissima, Aegilops searsii, Aegilops sharonensis, Aegilops speltoides, and Triticum urartu has been implicated as the donor of the B genome in the polyploid wheats. Biochemical and cytological data have revealed that T. urartu possesses a genome similar to that of T. monococcum, and therefore it may be the source of the A genome in T. turgidum and T. aestivum. This revelation therefore excludes T. urartu from the list of putative B-genome donors. To determine which of the remaining species is the source of the B chromosome set, the amino acid sequences of their purothionins were compared with that of the α1 purothionin coded for by the Pur-1B gene on chromosome 1 in the B genome of T. turgidum and T. aestivum. The residue sequences of this protein from Ae. bicornis, Ae. longissima, Ae. searsii, Ae. sharonensis, and Ae. speltoides differed by 1, 6, 1, 1, and 2 amino acid substitutions, respectively, from the α1 protein. These results suggest that either Ae. bicornis, Ae. searsii, or Ae. sharonensis was the most likely donor of the B genome. If the B genome in the polyploid wheats is monophyletic in origin, the collective findings of this and other investigations indicate that Ae. searsii is the most likely donor. The possibility that the B genome in the polyploid wheats could have a polyphyletic origin is also discussed.Key words: polyploid wheats, putative B-genome donors, purothionins, monophyletic, polyphyletic.

scholarly journals Localization of the genes controlling B chromosome transmission rate in maize (Zea mays ssp. mays , Poaceae)

1998 ◽  
Vol 85 (11) ◽  
pp. 1581-1585 ◽  
Author(s):  
Amilcar M. Chiavarino ◽  
Marcela Rosato ◽  
Pablo Rosi ◽  
Lidia Poggio ◽  
Carlos A. Naranjo
Keyword(s):  
Zea Mays ◽  
Transmission Rate ◽  
B Chromosome ◽  
Chromosome Transmission

scholarly journals A new property of the maize B chromosome.

Genetics ◽  
1992 ◽  
Vol 131 (1) ◽  
pp. 211-223 ◽  
Author(s):  
W R Carlson ◽  
R R Roseman
Keyword(s):  
Genetic Control ◽  
Sharp Decrease ◽  
Genetic System ◽  
B Chromosome ◽  
B Chromosomes ◽  
Chromosome 9 ◽  
High Frequencies ◽  
Very High Frequencies ◽  
Very High ◽  
Chromosome Regions

Abstract TB-9Sb is a translocation between the B chromosome and chromosome 9 in maize. Certain deletions of B chromatin from the translocation cause a sharp decrease in B-9 transmission compared to the rate for standard TB-9Sb. The deletions remove components of a B chromosome genetic system that serves to suppress meiotic loss in the female. At least two distinct B-chromosome regions suppress meiotic loss: one on the B-9 and one on 9-B. The system operates by stabilizing univalent B-type chromosomes. It allows the univalents to migrate to one pole in meiosis, despite the absence of a pairing partner. The findings reported here are the first evidence for genetic control of meiotic loss by a B chromosome. However, it is proposed that the practice of suppressing meiotic loss is common to the B chromosomes of all species. The need to suppress meiotic loss results from the fact that B chromosomes are frequently unpaired in meiosis and subject to very high frequencies of loss. B chromosomes may utilize one or more of the following methods to suppress meiotic loss: (a) regular migration of univalent B's to one pole in meiosis, (b) enhanced recombination between B chromosomes and (c) mitotic nondisjunction.

scholarly journals Tissue-Specific Transcriptome Analysis Reveals Candidate Transcripts Associated with the Process of Programmed B Chromosome Elimination in Aegilops speltoides

2020 ◽  
Vol 21 (20) ◽  
pp. 7596
Author(s):  
Anastassia Boudichevskaia ◽  
Alevtina Ruban ◽  
Johannes Thiel ◽  
Anne Fiebig ◽  
Andreas Houben
Keyword(s):  
Transcriptome Analysis ◽  
Enrichment Analysis ◽  
Chromosome Elimination ◽  
B Chromosome ◽  
Aegilops Speltoides ◽  
Transcript Isoforms ◽  
Meristematic Cells ◽  
Go Enrichment ◽  
Laser Capture ◽  
Go Enrichment Analysis

Some eukaryotes exhibit dramatic genome size differences between cells of different organs, resulting from programmed elimination of chromosomes. Here, we present the first transcriptome analysis of programmed chromosome elimination using laser capture microdissection (LCM)-based isolation of the central meristematic region of Aegilops speltoides embryos where B chromosome (B) elimination occurs. The comparative RNA-seq analysis of meristematic cells of embryos with (Bplus) and without Bs (B0) allowed the identification of 14,578 transcript isoforms (35% out of 41,615 analyzed transcript isoforms) that are differentially expressed during the elimination of Bs. A total of 2908 annotated unigenes were found to be up-regulated in Bplus condition. These genes are either associated with the process of B chromosome elimination or with the presence of B chromosomes themselves. GO enrichment analysis categorized up-regulated transcript isoforms into 27 overrepresented terms related to the biological process, nine terms of the molecular function aspect and three terms of the cellular component category. A total of 2726 annotated unigenes were down-regulated in Bplus condition. Based on strict filtering criteria, 341 B-unique transcript isoforms could be identified in central meristematic cells, of which 70 were functionally annotated. Beside others, genes associated with chromosome segregation, kinetochore function and spindle checkpoint activity were retrieved as promising candidates involved in the process of B chromosome elimination.

scholarly journals The U2 snDNA Is a Useful Marker for B Chromosome Detection and Frequency Estimation in the Grasshopper Abracris flavolineata

2017 ◽  
Vol 151 (1) ◽  
pp. 36-40 ◽  
Author(s):  
Diogo Milani ◽  
Octavio M. Palacios-Gimenez ◽  
Diogo C. Cabral-de-Mello
Keyword(s):  
Evolutionary History ◽  
Frequency Estimation ◽  
B Chromosome ◽  
B Chromosomes ◽  
Future Studies ◽  
Functional Studies ◽  
Chromosome Transmission ◽  
Somatic Tissues ◽  
Frequency Changes

In this study, we describe a strategy to determine the presence of B chromosomes in the living grasshopper Abracris flavolineata by FISH using U2 snDNA as a probe in interphase hemolymph nuclei. In individuals without B chromosomes, (0B) 2 dot signals were noticed, corresponding to A complement U2 snDNA clusters. In +1B and +2B individuals, 4 or 8 additional signals were noticed, respectively. In all cases, the absence or presence of 1 or 2 B chromosomes correlated in hemolymph and in somatic or germline tissues, validating the efficiency of the marker. Our data suggest that the B chromosome of A. flavolineata is present in all somatic tissues. B-carrying individuals showed the same number of B chromosomes in germ and somatic cells, suggesting that the B is mitotically stable. The marker was used to compare B chromosome frequency in the analyzed population with a sample collected previously, in order to test for B frequency changes and differences of B chromosome prevalence among sexes, but no statistically significant differences were noticed. The identification of living animals harboring B chromosomes will be very useful in future studies of B chromosome transmission, as well as in functional studies involving RNA analysis, thus contributing to the understanding of evolutionary history and the possible role of the B chromosome in A. flavolineata.

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