B–A chromosome mediated 3:1 disjunction in heterozygous reciprocal translocations of maize

Genome ◽  
1992 ◽  
Vol 35 (5) ◽  
pp. 714-718 ◽  
Author(s):  
B. Kindiger ◽  
S. Hamann
Keyword(s):  
Zea Mays ◽  
Plant Breeding ◽  
Reciprocal Translocation ◽  
Zea Mays L ◽  
Chromosome Mapping ◽  
Root Tip ◽  
Meiotic Segregation ◽  
Basic Information ◽  
Reciprocal Translocations ◽  
Unusual Chromosome

In maize (Zea mays L.), meiotic segregation products of reciprocal translocations are well defined. The predictible meiotic behaviors and products generated by these interchanges allow them to be used as tools to gain basic information in cytogenetics, genetics, and plant breeding. In combining a classic reciprocal translocation with a single B–A chromosome from a tertiary trisomic B–A translocation stock, unique individuals with unusual chromosome karyotypes are generated. In cases where a B–A chromosome was present, the frequency of 3:1 disjunction within the ring of four was increased. In the case of T6–9(5454) + B–6Ld, cytological identification, via root-tip mitosis, was able to identify the specific tertiary trisomic products generated. These karyotypes are predictable and highly repeatable. Such karyotypes may have specific uses in chromosome mapping, chromosome dosage studies, or genetic or molecular investigations.Key words: reciprocal translocations, tertiary trisomes, interchange trisomes, B–A translocations, maize.

scholarly journals Using 3D X-ray Microscopy to Study Crown Root Development and Primary Root Tip Growth in Diverse Maize (Zea mays L.) Lines

2019 ◽  
Vol 25 (S2) ◽  
pp. 1032-1033 ◽  
Author(s):  
Keith E. Duncan ◽  
Adam L. Bray ◽  
Tyler G. Dowd ◽  
Christopher N. Topp
Keyword(s):  
Zea Mays ◽  
Root Development ◽  
Tip Growth ◽  
Zea Mays L ◽  
Primary Root ◽  
Root Tip ◽  
X Ray ◽  
Crown Root

Analysis of chromosome segregation in reciprocal translocation carriers

2020 ◽  
pp. 16-18
Author(s):  
З.Н. Тонян ◽  
И.Л. Пуппо ◽  
А.Ф. Сайфитдинова ◽  
Ю.А. Логинова ◽  
О. Г. Чиряева ◽  
...  
Keyword(s):  
Genetic Counseling ◽  
Chromosome Segregation ◽  
Birth Defects ◽  
Reciprocal Translocation ◽  
Spontaneous Abortions ◽  
Meiotic Segregation ◽  
Cleavage Stage ◽  
Reciprocal Translocations ◽  
Recurrent Spontaneous Abortions ◽  
Increased Risk

Аутосомные реципрокные транслокации (АРТ) приводят к повышенному риску образования несбалансированных гамет вследствие патологической сегрегации хромосом в мейозе у носителей. В настоящей статье приведены результаты анализа типов сегрегации для 26 АРТ, а также определены теоретически возможные варианты сегрегации хромосом. В 73% случаев у носителей АРТ в более, чем 50% бластомеров наблюдалось совпадение теоретического и детектируемого типов сегрегации. Полученные данные можно использовать для оптимизации персонализированного медико-генетического консультирования семей, где один из супругов является носителем АРТ, и имеющих репродуктивные проблемы, высокий риск неразвивающейся беременности и/или рождения ребенка с хромосомной патологией. Autosomal reciprocal translocations (ART) lead to an increased risk of imbalanced gametes formation due to pathological meiotic segregation. Segregation type was analyzed and theoretical segregation pattern was determined in 26 cleavage stage embryos in this article. A coincidence of theoretical and detectable segregation types was observed in more than 50 % of blastomeres in 73 % of cases. The data obtained may be used for personalized genetic counseling in families with high risks of recurrent spontaneous abortions, infertility or children with birth defects due to ART.

scholarly journals Mapping a Telomere Using the Translocation eT1(III;V) in Caenorhabditis elegans

Genetics ◽  
1998 ◽  
Vol 150 (3) ◽  
pp. 1059-1066
Author(s):  
K A Adames ◽  
Jocelyn Gawne ◽  
Chantal Wicky ◽  
Fritz Müller ◽  
Ann M Rose
Keyword(s):  
Caenorhabditis Elegans ◽  
Reciprocal Translocation ◽  
Dark Spot ◽  
Meiotic Segregation ◽  
Wild Type ◽  
Reciprocal Translocations ◽  
C Elegans ◽  
Embryonic Arrest ◽  
Telomere Probe ◽  
Left Portion

Abstract In Caenorhabditis elegans, individuals heterozygous for a reciprocal translocation produce reduced numbers of viable progeny. The proposed explanation is that the segregational pattern generates aneuploid progeny. In this article, we have examined the genotype of arrested embryonic classes. Using appropriate primers in PCR amplifications, we identified one class of arrested embryo, which could be readily recognized by its distinctive spot phenotype. The corresponding aneuploid genotype was expected to be lacking the left portion of chromosome V, from the eT1 breakpoint to the left (unc-60) end. The phenotype of the homozygotes lacking this DNA was a stage 2 embryonic arrest with a dark spot coinciding with the location in wild-type embryos of birefringent gut granules. Unlike induced events, this deletion results from meiotic segregation patterns, eliminating complexity associated with unknown material that may have been added to the end of a broken chromosome. We have used the arrested embryos, lacking chromosome V left sequences, to map a telomere probe. Unique sequences adjacent to the telomeric repeats in the clone cTel3 were missing in the arrested spot embryo. The result was confirmed by examining aneuploid segregants from a second translocation, hT1(I;V). Thus, we concluded that the telomere represented by clone cTel3 maps to the left end of chromosome V. In this analysis, we have shown that reciprocal translocations can be used to generate segregational aneuploids. These aneuploids are deleted for terminal sequences at the noncrossover ends of the C. elegans autosomes.

scholarly journals Investigation on genetic control for yield and yield contributing traits in advanced generation of maize (Zea mays L.)

2018 ◽  
Vol 42 (4) ◽  
pp. 715-724
Author(s):  
S Begum ◽  
M Amiruzzaman ◽  
A Ahmed ◽  
SH Omy ◽  
MM Rohman
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Plant Breeding ◽  
Combining Ability ◽  
Zea Mays L ◽  
General Combining Ability ◽  
Yield Data ◽  
Early Variety ◽  
Ear Height ◽  
Advanced Generation

Twenty five cross progeny of maize developed by Plant Breeding Division of BARI were evaluated by determining general combining ability (GCA) and specific combining ability (SCA) effects following line × tester design involving five female lines and five testers for grain yield and other yield contributing traits. Highly significant genotypic variances specified inclusive inconsistency existed among the genotypes. None of the lines showed significant GCA effects for all the characters, but the line Pac-60/S4-3 and Pac-60/S4-9 showed negative GCA effect for days to 50% tasseling and silking which is desirable to develop early variety. Additionally, the line Pac-60/S4-9, Pac-60/S4-18 and Pac-60/S4-21 showed negative GCA effect for plant and ear height which is also desirable to develop dwarf variety. Nevertheless, none of the cross showed significant SCA effect for any character studied, but crosses Pac-60/S4-21×BIL-113, Pac-60/S4-21×Utn/S4-15, Pac-60/S4-18×Utn/S4-8, Pac-60/S4-3×BIL-113, Pac-60/S4-3×Utn/S4-18, Pac-60/S4-9×Utn/S4-15, Pac-60/S4-9×BIL-113 and Pac-60/S4-21×Utn/S4-10 had higher yield with positive SCA effects. However, considering yield data along with lodging percentage, five crosses namely Pac-60/S4-21×BIL-113, Pac-60/S4-21×Utn/S4-15, Pac-60/S4-21×Utn/S4-10 Pac-60/S4-9×Utn/S4-15 and Pac-60/S4-3×BIL-113 showed better performance.Bangladesh J. Agril. Res. 42(4): 715-724, December 2017

The effects of nano-TiO2 on seed germination, development and mitosis of root tip cells of Vicia narbonensis L. and Zea mays L

2010 ◽  
Vol 13 (6) ◽  
pp. 2443-2449 ◽  
Author(s):  
Monica Ruffini Castiglione ◽  
Lucia Giorgetti ◽  
Chiara Geri ◽  
Roberto Cremonini
Keyword(s):  
Zea Mays ◽  
Seed Germination ◽  
Zea Mays L ◽  
Root Tip ◽  
Nano Tio2 ◽  
Vicia Narbonensis ◽  
Tip Cells ◽  
Root Tip Cells

BANDING PATTERNS IN MAIZE MITOTIC CHROMOSOMES

1980 ◽  
Vol 22 (1) ◽  
pp. 61-67 ◽  
Author(s):  
E. J. Ward
Keyword(s):  
Zea Mays ◽  
Chromosome Banding ◽  
Zea Mays L ◽  
B Chromosomes ◽  
Abnormal Chromosome ◽  
Root Tip ◽  
Mitotic Chromosomes ◽  
Chromosome 10 ◽  
Banding Patterns

A procedure for chromosome banding in triticale has been shown to be equally effective on maize, Zea mays L., root tip chromosomes. Stocks of known knob constitution were used to demonstrate that differentially stained regions of C-banded mitotic chromosomes corresponded with knobs. The large knob and prominent chromomeres of abnormal chromosome 10 were also differentiated, as was the centric heterochromatin of B chromosomes. However, the large distal heterochromatic portion of the B was not differentiated by the procedure.

scholarly journals Mapping of a novel viviparous unstable mutant of maize (vp 12)

1997 ◽  
Vol 20 (1) ◽  
pp. 71-74 ◽  
Author(s):  
Paula G. Araujo ◽  
William J. da Silva ◽  
Mirian P. Maluf ◽  
Laudenir M. Prioli
Keyword(s):  
Zea Mays ◽  
Linkage Group ◽  
Inbred Line ◽  
Reciprocal Translocation ◽  
Genetic Instability ◽  
Zea Mays L ◽  
Chromosome 6 ◽  
Tropical Regions

A new viviparous mutant of maize (Zea mays L.), associated with genetic instability and designated viviparous-12 (vp12), was identified in a synthetic Tuxpeño adapted to tropical regions. In the present work, the linkage group of this new locus was determined. Progenies of inbred line L477 segregating for the vp12 mutant were crossed with waxy-marked reciprocal translocation stocks. The phenotypic frequencies of the wx and vp12 mutants were analyzed in F2 progenies. The results demonstrated that the Viviparous-12 locus of maize is located on the long arm of chromosome 6.

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