THE IDENTIFICATION AND MEIOTIC BEHAVIOR OF A DITELOSOMIC LINE IN AVENA SATIVA L

A ditelosomic line was crossed with 12 identified monosomics. The metaphase I pairing was studied in the 40 + t – chromosome progenies. The telocentric chromosome was found to be homologous to the three previously identified monosomics namely, −7, −10, and −20 suggesting that the same chromosome is missing in all three lines. None of the chromosomes in monosomic condition used in the crosses except ST-7 and ST-17 from A. byzantina were involved in the reciprocal translocation present between Sun II and Garry and Rodney.The gene for normal vs. abaxial curling of the leaves was located on the short arm of chromosome 20. The genes for diploidisation and normal vs. kinky neck were located on 20L.

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THE MEIOTIC BEHAVIOR OF ANEUPOLYHAPLOIDS OF THE CULTIVATED OAT AVENA SATIVA (2n = 6x = 42)

Canadian Journal of Genetics and Cytology ◽

10.1139/g77-070 ◽

1977 ◽

Vol 19 (4) ◽

pp. 651-656 ◽

Cited By ~ 13

Author(s):

J. M. Leggett

Keyword(s):

Genetic Control ◽

Chromosome Pairing ◽

Avena Sativa ◽

Meiotic Behavior ◽

Homoeologous Chromosomes

Chromosome pairing and the frequency of secondary associations in two aneupolyhaploid plants of A. sativa are described. There was little evidence of pairing between homoeologous chromosomes in either plant. The results are discussed in relation to the genetic control of bivalent pairing in A. sativa and the possible divergence between the constituent genomes.

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Chromosome Number and Meiotic Behavior of Cultivated Chia, Salvia hispanica (Lamiaceae)

HortScience ◽

10.21273/hortsci.25.12.1646 ◽

1990 ◽

Vol 25 (12) ◽

pp. 1646-1647 ◽

Cited By ~ 17

Author(s):

A. Estilai ◽

A. Hashemi ◽

K. Truman

Keyword(s):

Chromosome Number ◽

Species Identification ◽

Southern California ◽

Herbarium Specimens ◽

Meiotic Behavior ◽

Root Tips ◽

Chromosome Counts ◽

Salvia Hispanica ◽

Meiotic Analyses ◽

Metaphase I

Edible chia seeds, purchased from the local markets in Guatemala, Mexico, and southern California, were used for species identification, chromosome counts, karyotype construction, and meiotic analyses. Plants raised from those seeds had ovate leaves, dense racemose inflorescences, pale-blue flowers, and were identified from herbarium specimens as Salvia hispanica L. Mitotic analyses of root tips from 50 plants showed 2n = 12—the lowest chromosome number in the genus. Chromosomes were small, ranging from 2 to 3.5 pm. One pair of chromosomes was metacentric (with the long arm: short arm ratio, r = 1.5), four pairs were submetacentric (r = 2.6 to 3.6), and one pair was telocentric (r = 12). Meiosis was regular and six bivalents were observed at metaphase I. Ring and rod bivalents averaged 1.53 ± 1.05 and 4.47 ± 1.05, respectively;

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CYTOGENETIC, ECOLOGIC AND MORPHOLOGIC STUDIES IN BRAZILIAN FORMS OF PASPALUM DILATATUM

Canadian Journal of Genetics and Cytology ◽

10.1139/g68-018 ◽

1968 ◽

Vol 10 (1) ◽

pp. 131-138 ◽

Cited By ~ 24

Author(s):

M. Irene B. De Moraes Fernandes ◽

I. L. Barreto ◽

F. M. Salzano

Keyword(s):

Meiotic Behavior ◽

Paspalum Dilatatum ◽

Wide Range ◽

Somatic Number ◽

The Common ◽

Metaphase I

The somatic number, meiotic behavior, morphology and ecology of five forms of Paspalum dilatatum Poir are reported. The sexual type yellow anther (2n = 40) showed essentially regular meiotic behavior. The common form (2n = 50) presented 20 II and 10 I in about 85% of the cells studied at diakinesis and metaphase I. Pauciciliatum (2n = 40) and Uruguaiana (2n = 60) showed a wide range of chromosome configurations at these stages; finally, Torres presented uniformly 60 univalents. These results are compared with morphologic and ecologic data and some suggestions about the possible mode of origin of these forms are presented.

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Centromere orientation at metaphase I of a translocation heterozygote in lentil

Canadian Journal of Genetics and Cytology ◽

10.1139/g83-083 ◽

1983 ◽

Vol 25 (6) ◽

pp. 547-553 ◽

Cited By ~ 3

Author(s):

Frida Buruchin ◽

G. Ladizinsky

Keyword(s):

Reciprocal Translocation ◽

Acrocentric Chromosome ◽

Similar Length ◽

Translocation Heterozygote ◽

Ring Bivalents ◽

Acrocentric Chromosomes ◽

Number Of Cells ◽

Metaphase I

Reciprocal translocation between submetacentric and acrocentric chromosomes of lentil was studied. This interchange did not entail karyotypic changes. Two homomorphic ring bivalents produced by the four chromosomes of the translocation complex indicated that the long arm of the acrocentric chromosome was involved in the interchange. Chiasmata distribution in the native arms, the translocated and interstitial segments in bivalents and quadrivalents, was taken as an indication for two pairing pattern in the translocation complex. Chiasma terminalization in the short arm of the acrocentric chromosome of the translocation complex was faster in bivalents than in quadrivalents. The overwhelming number of cells with alternate-1 compared with alternate-2 orientation was attributed to the similar length of the zigzag diagonals of alternate-1 that apparently induced greater stability. The necessary elements for adjacent-2 orientation were available in the examined material but were practically absent. Pole–centromere specificity was proposed for explaining the absence of adjacent-2 in the present and other studies and the orientation of homologous centromeres to opposite poles even when they were located in different bivalents.

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ASSOCIATION OF ISOZYMES WITH A RECIPROCAL TRANSLOCATION IN CULTIVATED RYE (SECALE CEREALE L.)

Genetics ◽

10.1093/genetics/109.1.177 ◽

1985 ◽

Vol 109 (1) ◽

pp. 177-193

Author(s):

Ana M Figueiras ◽

Maria T Gonzalez-Jaen ◽

Julio Salinas ◽

Cesar Benito

Keyword(s):

Secale Cereale ◽

Reciprocal Translocation ◽

Chromosome Arrangement ◽

Electrophoretic Patterns ◽

Meiotic Configuration ◽

Chromosome Arm ◽

Secale Cereale L ◽

Metaphase I

ABSTRACT In rye (Secale cereale L. cv. "Ailés") the progeny of a cross between a structural heterozygote for a reciprocal translocation (involving the 1R chromosome) and a homozygote for the standard chromosome arrangement were analyzed for the electrophoretic patterns of eight different leaf isozymes and also for their meiotic configuration at metaphase I.—The Got-3 and Mdh-2b loci are linked to each other and also to the reciprocal translocation. The Mdh-2b locus is located in the interstitial segment of the 3Rq chromosome arm, with an estimated distance of 8 cM to the breakpoint. Therefore, the reciprocal translocation involves the 1R and 3R chromosomes.—Also, the Mdh-1 and 6-Pgd-2 loci are linked (16 ± 3 cM) and have been located on the 2Rq arm. Finally, the Per-3 and Per-4 loci are located on the 2Rp chromosome arm at an estimated distance of 26 ± 4 cM.

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Morphology and Meiotic Behavior of Three Dendrobium Amphidiploids and Their Diploid Counterparts

HortScience ◽

10.21273/hortsci.28.9.935 ◽

1993 ◽

Vol 28 (9) ◽

pp. 935-937 ◽

Cited By ~ 5

Author(s):

James McConnell ◽

H. Kamemoto

Keyword(s):

Small Chromosome ◽

Chromosome Size ◽

Meiotic Behavior ◽

Preferential Pairing ◽

Bivalent Formation ◽

Metaphase I

Floral characteristics, meiotic behavior, and sporad formation were compared in three Dendrobium tetraploids (amphidiploids) and their diploid counterparts. Amphidiploid flowers were larger than those of diploids. Diploid meiotic behavior varied; mean configurations at Metaphase I ranged from 14.3 bivalents and 9.4 univalents to 18.9 bivalents and 0.2 univalents. In amphidiploids, nearly all cells had 38 bivalents. Sporad formation also varied; diploids had 36% to 70% tetrads and amphidiploids had 97% to 100% tetrads. Preferential pairing and small chromosome size may promote bivalent formation in amphidiploids.

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Meiotic Behavior of Induced Reciprocal Translocation Heterozygote during Microsporogenesis of Brassica campestris L. (Brassicaceae)

CYTOLOGIA ◽

10.1508/cytologia.78.43 ◽

2013 ◽

Vol 78 (1) ◽

pp. 43-49 ◽

Cited By ~ 1

Author(s):

Girjesh Kumar ◽

Kshama Dwivedi

Keyword(s):

Reciprocal Translocation ◽

Brassica Campestris ◽

Meiotic Behavior ◽

Translocation Heterozygote

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Chromosome stickiness during meiotic behavior analysis of Passiflora serrato-digitata L. (PassifloraCEAE)

Ciência Rural ◽

10.1590/s0103-84782011005000076 ◽

2011 ◽

Vol 41 (6) ◽

pp. 1018-1023 ◽

Cited By ~ 4

Author(s):

Paulo Roberto Peres Kiihl ◽

Andréia Rodrigues Alonso Pereira ◽

Sara Mataroli de Godoy ◽

Neusa Maria Colauto Stenzel ◽

Claudicéia Risso-Pascotto

Keyword(s):

Behavior Analysis ◽

Metaphase Plate ◽

Meiotic Behavior ◽

American Continent ◽

Segregation Process ◽

Ethanol Acetic Acid ◽

Experimental Base ◽

Chromosome Stickiness ◽

First Time ◽

Metaphase I

Almost 90% of species of the genus Passiflora are native to the American continent, with high commercial value due to the fact that some species are used for human food while others have ornamental and medical qualities. Passiflora serrato-digitata is one of the species that integrates the Paraná Agronomic Institute germoplasm bank at its experimental base in Londrina, PR, Brazil. Collected flower buds were fixed in ethanol/acetic acid (3:1 v/v) for 24h, transferred to 70% alcohol and stored under refrigeration. Slides were prepared by the squashing technique and stained with 1.0% propionic carmine; they were analyzed under an optic microscope. Irregularities in the chromosome segregation process of P. serrato-digitata have been verified by meiotic behavior analysis. These comprised precocious migration to poles in metaphase I and II, non-oriented chromosomes in metaphase plate in metaphase I and II, laggard chromosomes in anaphase I and II towards the formation of micronucleus in telophase I and II, and microspores in tetrads. Chromosome stickiness was another irregularity reported in the Passiflora genus for the first time. These irregularities which also contributed to the formation of monads, dyads and triads, resulted in normal imbalanced 2n and 4n microspores. According to the observed Meiotic Index of 71.83%, this species is not meiotically stable.

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THE CYTOGENETICS OF A DITELOTETRASOMIC LINE IN BARLEY

Canadian Journal of Genetics and Cytology ◽

10.1139/g70-074 ◽

1970 ◽

Vol 12 (3) ◽

pp. 553-559 ◽

Cited By ~ 6

Author(s):

George Fedak ◽

S. B. Helgason

Keyword(s):

High Frequency ◽

Meiotic Behavior ◽

Normal Complement ◽

Selfed Progeny ◽

Pollen Transmission ◽

Telocentric Chromosomes ◽

I Cells ◽

Metaphase I

A ditelotetrasomic line (14+2−1S) carrying two telocentric chromosomes in addition to the normal complement was isolated in the selfed progeny of a monotelotrisomic (14+1S) of barley. The plants were shorter and later maturing than the disomic, and highly sterile. In diakinesis and metaphase I cells at meiosis, the extra telos showed a high frequency of pairing with each other and with their normal homologues, resulting in 6″ + (t″ + 1″) and 7″ + t″ as the most frequent configurations. Regular meiotic behavior at subsequent stages resulted in a 42.2% frequency of pollen transmission of the extra telos. Selfed progenies gave rise to 7.1% diploids, 45.7% monotelotrisomics and 47.2% ditelotetrasomics.

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