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.

THE EFFECT OF ACCESSORY CHROMATIN ON CHIASMA DISTRIBUTION IN MAIZE

1976 ◽  
Vol 18 (3) ◽  
pp. 479-484 ◽  
Author(s):  
Edward J. Ward
Keyword(s):  
Zea Mays ◽  
Chiasma Frequency ◽  
Zea Mays L ◽  
Chiasma Formation ◽  
B Chromosome ◽  
Abnormal Chromosome ◽  
Chromosome 10 ◽  
Chiasma Distribution ◽  
Metaphase I

From an analysis of metaphase I bivalent configurations in Zea mays L. it was possible to determine the effects of two supernumerary elements on chiasma formation. Both the B chromosome and abnormal chromosome 10 increased chiasma frequency. In addition to enhancing total exchanges, both elements caused a redistribution of chiasmata from distal to more proximal locations.

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

scholarly journals Diversity and abundance of the abnormal chromosome 10 meiotic drive complex in Zea mays

Heredity ◽  
2013 ◽  
Vol 110 (6) ◽  
pp. 570-577 ◽  
Author(s):  
L B Kanizay ◽  
T Pyhäjärvi ◽  
E G Lowry ◽  
M B Hufford ◽  
D G Peterson ◽  
...  
Keyword(s):  
Zea Mays ◽  
Meiotic Drive ◽  
Abnormal Chromosome ◽  
Chromosome 10

Adjacent II segregation products in B–A translocations of maize

Genome ◽  
1991 ◽  
Vol 34 (4) ◽  
pp. 595-602 ◽  
Author(s):  
B. Kindiger ◽  
C. Curtis ◽  
J. B. Beckett
Keyword(s):  
Zea Mays ◽  
Key Words ◽  
Zea Mays L ◽  
Genetic Data ◽  
B Chromosomes ◽  
Cytological Data ◽  
Opposite Pole

In maize (Zea mays L.), meiotic events in B–A translocations that cause the A chromosome to move to one pole and the A–B and B–A chromosomes to move to the opposite pole result in the production of balanced, functional microspores and megaspores. Meiotic events that allow other combinations of chromosomes to proceed to the two poles (A A–B and A B–A) lead to the production of both duplicate (A A–B) and deficient (B–A) spores. Microspores and often megaspores that are deficient for a segment of the A chromosome are expected to abort. Duplication-bearing gametes usually function through the egg but are less able to compete with the normal gametes in the pollen. Cytological data, and genetic data from pollen, kernel, and seedling counts, were used to identify the production of A A–B gametes by B–A translocation heterozygotes and hyperploids. Adjacent II segregation of the A and A–B chromosomes of B–A heterozygotes and hyperploids has been detected in stocks of several different B–A translocations. Some B–A translocations exhibited a frequency of adjacent II segregation as high as 23%.Key words: Zea mays, adjacent segregation, B chromosomes, translocation.

scholarly journals THE EFFECTS OF B, K10, AND AR CHROMOSOMES ON THE RESISTANCE OF MAIZE TO VIRAL INFECTION

Genetics ◽  
1978 ◽  
Vol 90 (2) ◽  
pp. 331-338
Author(s):  
Scott C McGirr ◽  
J E Endrizzi
Keyword(s):  
Zea Mays ◽  
Viral Infection ◽  
Mosaic Virus ◽  
Zea Mays L ◽  
Brome Mosaic Virus ◽  
B Chromosomes ◽  
Maize Dwarf Mosaic Virus ◽  
Barley Stripe Mosaic Virus ◽  
Test Results ◽  
Leaf Necrosis

ABSTRACT Studies were conducted to determine if accessory (B) chromosomes, the abnormal tenth (K10) chromosome or the aberrant ratio (AR) phenomenon of maize (Zea mays L.) affect the resistance of the plants to viral infection. Genetically similar stocks of maize with and without these elements were compared to determine what effect they would have on the plants response to Brome Mosaic Virus (BMV), Maize Dwarf Mosaic Virus (MDMV), Wheat Streak Mosaic Virus (WSMV) and Barley Stripe Mosaic Virus (BSMV).—The test results with BSMV were not found to be conclusive. With BMV and MDMV, neither the B orK10 chromosomes were found to alter infections; however, these chromosomes were found to affect the resistance of the plants to WSMV infection. The B chromosomes were found to delay the onset of leaf necrosis by 15%, while the K10 chromosome was found to increase the susceptibility to necrosis by 100%. The AR phenomenon was not found to alter the resistance of maize to BMV infection. However, it was found to increase the susceptibility of maize to MDMV infection by 36% and to decrease the susceptibility of maize to WSMV infection by 92%.

B chromosomes of maize ( Zea mays L.) are positioned nonrandomly within sperm nuclei

2001 ◽  
Vol 13 (4) ◽  
pp. 231-234 ◽  
Author(s):  
Maxine Losoff Rusche ◽  
H. L. Mogensen ◽  
Annie Chaboud ◽  
Jean-Emmanuel Faure ◽  
Mireille Rougier ◽  
...  
Keyword(s):  
Zea Mays ◽  
Zea Mays L ◽  
B Chromosomes ◽  
Sperm Nuclei
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