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 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 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

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 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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