Results 191 to 200 of about 2,419 (214)

A WHEAT MUTATION CONDITIONING AN INTERMEDIATE LEVEL OF HOMOEOLOGOUS CHROMOSOME PAIRING

Canadian Journal of Genetics and Cytology, 1982
An X-ray-induced mutation in common wheat (Triticum aestivum L.), designated ph2, conditions an intermediate level of homoeologous chromosome pairing in hybrids with Triticum kotschyi var. variabilis. The number of chromosomes paired averaged 9.2 per sporocyte, compared with 2.0 in the control and 27.9 in the same hybrid involving ph1b, an apparent ...
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EFFECT OF RYE ON HOMOEOLOGOUS CHROMOSOME PAIRING IN WHEAT × RYE HYBRIDS

Canadian Journal of Genetics and Cytology, 1977
The number of chiasmata per cell at metaphase I was scored in eight haploid plants of Triticum aestivum L. emend. Thell. cv. 'Chinese Spring' and 100 hybrid plants of Chinese Spring × Secale cereale L. Mean chiasma frequency per cell ranged from 0.00 to 3.59 in the hybrids and from 0.17 to 0.35 in the haploids.
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Homoeologous Chromosome Pairing: Frequency Differences in Inbred and Intraspecific Hybrid Polyploid Ferns

Science, 1978
The homosporous fern Ceratopteris thalictroides (Parkeriaceae) has evolved a polyploid genetic system that serves to store and release genetic variability in spite of self-fertilization and Mendelian homozygosity. This is demonstrated by the segregation of a gametophyte mutant within two inbred tetraploid lines and ...
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Control of Meiotic Chromosome Pairing by the Chromosomes of Homoeologous Group 5 of Triticum aestivum

Nature, 1966
Triticum aestivum (2n= 6x = 42) is an allohexaploid species in which the three genomes (A, B and D] were derived from closely related 14-chromosome diploid species1. Every pair of homologous chromosomes has a genetically corresponding, or homoeologous, pair in each of the other two genomes2.
RALPH RILEY, VICTOR CHAPMAN, R. M. YOUNG, ANGELA M. BELFIELD   +3 more
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Different genetic systems in rye affecting homoeologous pairing in wheat – rye combinations

Genome, 1988
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 ...
M. C. Cuadrado, C. Romero
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Increased homoeologeous chromosome pairing in Hordeum vulgare × Triticum aestivum hybrids

Nature, 1977
WHEAT and barley are the most important cereals in the agriculture of temperate zones. Although both genera belong to the same tribe, Triticeae, apparently successful crosses between wheat and barley have been reported recently1,2. I report here the production, morphology and cytology of F1 hybrids of Hordeum vulgare L.
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Interaction between rye B-chromosomes and wheat genetic systems controlling homoeologous pairing

Chromosoma, 1980
The interactive effect on homoeologous pairing of rye B-chromosomes with the absence of both pairing suppressor (3A, 3D, 5B) and promotor (3B, 5A, 5D) chromosomes of common wheat (Triticum aestivum L.) is analyzed by comparison of pairing at Metaphase I of 27-, 27+2B, 28- and 28+2B-chromosome plants.
C. Romero, J. R. Lacadena
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INDUCTION OF HOMOEOLOGOUS PAIRING IN WHEAT BY GENES OF RYE SUPPRESSING CHROMOSOME 5B EFFECT

Canadian Journal of Genetics and Cytology, 1976
To test the effect of single rye chromosomes on the pairing of homoeologous wheat chromosomes, the seven wheat-rye addition lines of "Chinese Spring" and "Imperial" were crossed with Secale cereale L. and S. montanum L. In haploid triticale with 28 chromosomes (ABD R) no homoeologous pairing was induced.
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GENETIC VARIABILITY INAEGILOPS SPELTOIDESAFFECTING HOMOEOLOGOUS PAIRING IN WHEAT

Canadian Journal of Genetics and Cytology, 1972
Three Chinese Spring ditelocentric lines and four Agropyron telocentric addition lines were crossed with a single population of Aegilops speltoides. Chromosome pairing was studied in the hybrid plants. The mean chiasma frequencies per cell in different hybrid plants indicate the existence of three different genotypes in the population of Ae. speltoides
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THE APOGAMOUS LIFE CYCLE OF TRICHOMANES PINNATUM—A CONFIRMATION OF KLEKOWSKI'S PREDICTIONS ON HOMOEOLOGOUS PAIRING

American Journal of Botany, 1975
The gametophyte of Trichomanes pinnatum is filamentous save for its club‐shaped archegoniophores. Gametangial structure is consistent with that of related species. The apogamous embryo originates from the archegonial jacket and contiguous tissue such that there is no external indication of ...
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