Interaction between rye B-chromosomes and wheat genetic systems controlling homoeologous pairing

Chromosoma ◽  
1980 ◽  
Vol 80 (1) ◽  
pp. 33-48 ◽  
Author(s):  
C. Romero ◽  
J. R. Lacadena
Keyword(s):  
B Chromosomes ◽  
Homoeologous Pairing ◽  
Genetic Systems

Meiotic pairing control in wheat–rye hybrids. II. Effect of rye genome and rye B-chromosomes and interaction with the wheat genetic system

Genome ◽  
1991 ◽  
Vol 34 (1) ◽  
pp. 76-80 ◽  
Author(s):  
C. Cuadrado ◽  
C. Romero ◽  
J. R. Lacadena
Keyword(s):  
Triticum Aestivum ◽  
Genetic System ◽  
B Chromosomes ◽  
Meiotic Pairing ◽  
Homoeologous Pairing ◽  
Homoeologous Group ◽  
Wheat Genotype ◽  
Main Determinant ◽  
Group 3 ◽  
Wheat Parent

Several hybrid combinations between rye and wheat ditelosomic for homoeologous group 3 or 5 chromosomes or mutant ph2b were used to analyze the effects of the rye genome and rye B-chromosomes on meiotic pairing. The results indicated that the rye Bs have an effect on bound-arm frequency, which varies with the wheat genotype. If wheat suppressors are absent, pairing decreases when Bs are added; whereas if wheat promoters are lacking, a pairing increase is observed in some hybrids with two rye Bs. There was thus an interaction between the genetic systems of the two parents, with the wheat parent being the main determinant of the pairing level in the hybrids. The rye genome tends to decrease pairing in the absence of wheat suppressors and increase it when wheat promoters are lacking, and the rye Bs tend to reinforce this primary rye action.Key words: Triticum aestivum, Secale cereale, homoeologous pairing, B-chromosomes, promoter–suppressor interaction.

Different genetic systems in rye affecting homoeologous pairing in wheat – rye combinations

Genome ◽  
1988 ◽  
Vol 30 (5) ◽  
pp. 793-796 ◽  
Author(s):  
M. C. Cuadrado ◽  
C. Romero
Keyword(s):  
Triticum Aestivum ◽  
Secale Cereale ◽  
Chinese Spring ◽  
Genetic System ◽  
The Other ◽  
Meiotic Pairing ◽  
Homoeologous Pairing ◽  
Major Genes ◽  
Genetic Systems ◽  
Polygenic System

The present study analyzed meiotic pairing in wheat – rye hybrids obtained by crossing of Triticum aestivum cv. Chinese Spring with allogamous ryes, two cultivars of Secale cereale ('Don Enrique' and 'Selectión') and Secale cereale ssp. segetale. The results indicate that each rye type has different behaviour on hybrid meiotic pairing because they contain distinct genetic systems affecting meiotic pairing. In the case of 'Don Enrique' and 'Selección,' a polygenic system could be present, but not identical in both cultivars. On the other hand, Secale cereale ssp. segetale contained genes that strongly affect the genetic system controlling homoeologous pairing in wheat.Key words: homoeologous pairing, wheat – rye hybrids, polygenic system, major genes.

scholarly journals Odd-even effect of rye B-chromosomes on homoeologous pairing in wheat-rye hybrids

Caryologia ◽  
1993 ◽  
Vol 46 (1) ◽  
pp. 17-23 ◽  
Author(s):  
M.A. Estepa ◽  
M.C. Cuadrado ◽  
C. Romero
Keyword(s):  
B Chromosomes ◽  
Homoeologous Pairing

The effect of B chromosomes on homoeologous pairing in species hybrids

Chromosoma ◽  
1976 ◽  
Vol 57 (1) ◽  
pp. 25-32 ◽  
Author(s):  
I. B. Taylor ◽  
G. M. Evans
Keyword(s):  
B Chromosomes ◽  
Homoeologous Pairing ◽  
Species Hybrids

QTL Mapping and Analysis Based on Embryo and Maternal Genetic Systems for Semi-Essential Amino Acid Contents in Rapeseed (Brassica napusL.)

2015 ◽  
Vol 41 (1) ◽  
pp. 57
Author(s):  
Juan WEN ◽  
Jian-Feng XU ◽  
Yan LONG ◽  
Hai-Ming XU ◽  
Jin-Ling MENG ◽  
...  
Keyword(s):  
Amino Acid ◽  
Qtl Mapping ◽  
Essential Amino Acid ◽  
Genetic Systems ◽  
Amino Acid Contents

scholarly journals Stability and Robustness of Unbalanced Genetic Toggle Switches in the Presence of Scarce Resources

Life ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 271
Author(s):  
Chentao Yong ◽  
Andras Gyorgy
Keyword(s):  
Cell Fate ◽  
Rational Design ◽  
Resource Competition ◽  
Dynamic Properties ◽  
Mechanistic Model ◽  
Robustness Analysis ◽  
System Level ◽  
Genetic Circuits ◽  
Scarce Resources ◽  
Genetic Systems

While the vision of synthetic biology is to create complex genetic systems in a rational fashion, system-level behaviors are often perplexing due to the context-dependent dynamics of modules. One major source of context-dependence emerges due to the limited availability of shared resources, coupling the behavior of disconnected components. Motivated by the ubiquitous role of toggle switches in genetic circuits ranging from controlling cell fate differentiation to optimizing cellular performance, here we reveal how their fundamental dynamic properties are affected by competition for scarce resources. Combining a mechanistic model with nullcline-based stability analysis and potential landscape-based robustness analysis, we uncover not only the detrimental impacts of resource competition, but also how the unbalancedness of the switch further exacerbates them. While in general both of these factors undermine the performance of the switch (by pushing the dynamics toward monostability and increased sensitivity to noise), we also demonstrate that some of the unwanted effects can be alleviated by strategically optimized resource competition. Our results provide explicit guidelines for the context-aware rational design of toggle switches to mitigate our reliance on lengthy and expensive trial-and-error processes, and can be seamlessly integrated into the computer-aided synthesis of complex genetic systems.

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