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.

MEASUREMENT OF EVAPORATION FROM SOIL BENEATH CROP CANOPIES

1983 ◽  
Vol 63 (1) ◽  
pp. 137-141 ◽  
Author(s):  
G. K. WALKER
Keyword(s):  
Zea Mays ◽  
Key Words ◽  
Leaf Area ◽  
Energy Supply ◽  
Zea Mays L ◽  
Growing Season ◽  
Soil Core ◽  
Crop Cover ◽  
Intact Soil Core ◽  
Intact Soil

Evaporation rates beneath maize canopies were measured using an intact soil core technique. Early in the growing season evaporation rates were periodically high (4.0 mm∙day−1) following rain, but declined rapidly. At full crop cover, when energy supply normally limits evaporation, significant differences in evaporation were detected between canopies with leaf area indices of 3.0 and 4.0. Key words: Evaporation measurement, energy supply, Zea mays L., leaf area, soil evaporimeter, lysimeter

Postemergence control of quackgrass [Elytrigia repens (L) Nevski] with DPX-79406 in corn (Zea mays L)

1994 ◽  
Vol 74 (2) ◽  
pp. 375-381 ◽  
Author(s):  
M. E. Reidy ◽  
C. J. Swanton
Keyword(s):  
Zea Mays ◽  
Key Words ◽  
Significant Interaction ◽  
Growth Stage ◽  
Field Experiments ◽  
Zea Mays L ◽  
Optimum Dose ◽  
Corn Yield ◽  
Leaf Stage ◽  
Elytrigia Repens

Laboratory and field experiments were established to determine the optimum dose and timing of postemergence applications of DPX-79406 for quackgrass control. Four node quackgrass rhizome fragments from each biotype were grown under controlled conditions. At the three-to-four-leaf stage, quackgrass plants were sprayed with DPX-79406 and evaluated for control. A significant response of quackgrass biotypes to DPX-79406 was evident only at lower doses. In the field, quackgrass was effectively controlled by all doses of DPX-79406. Significant growth-stage effects were observed for quackgrass shoot and rhizome dry weights in the year of application and in the year following application. There was a significant interaction between year and growth stage. In 1990, quackgrass biomass was greater when DPX-79406 was applied at the two-to-three-leaf stage of quackgrass than at the four-to-five-leaf stage. In 1991, however, the opposite occurred. Within a growth stage, the 6.25 g ha−1 dose was as effective for controlling quackgrass as 18.5 g ha−1, in both years of the study. In 1991, significant decreases in corn yield were observed for DPX-79406 doses of > 12.5 g ha−1 applied at the four-to-five-leaf stage of quackgrass. For all the variables studied, DPX-79406 doses of 6.25–12.5 g ha−1 resulted in consistent control of quackgrass. Key words: DPX-79406, nicosulfuron, rimsulfuron, quackgrass, Elytrigia repens, corn, Zea mays

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%.

CO446 corn inbred line

2010 ◽  
Vol 90 (5) ◽  
pp. 703-706
Author(s):  
L. M. Reid ◽  
X. Zhu
Keyword(s):  
Zea Mays ◽  
Key Words ◽  
Inbred Line ◽  
Combining Ability ◽  
Zea Mays L ◽  
Lodging Resistance ◽  
Cultivar Description ◽  
Short Season ◽  
Corn Inbred

CO446 is a short-season corn (Zea mays L.) inbred line with excellent combining ability and lodging resistance in hybrids. This inbred performed well as a parent with both stiff and non-stiff stalk inbreds. Excellent yields were achieved with the non-stiff stalk commercial inbred LH295 and the stiff-stalk commercial tester inbred TR2040. Key words: Corn, maize, Zea mays, cultivar description

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

CO445 corn inbred line

2010 ◽  
Vol 90 (5) ◽  
pp. 699-702
Author(s):  
L M Reid ◽  
X. Zhu
Keyword(s):  
Zea Mays ◽  
Key Words ◽  
Inbred Line ◽  
Combining Ability ◽  
Zea Mays L ◽  
Lodging Resistance ◽  
Cultivar Description ◽  
Short Season ◽  
Corn Inbred

CO445 is a short season corn (Zea mays L.) inbred line with excellent combining ability and lodging resistance in hybrids. This inbred performed well as a parent with both stiff stalk and non-stiff stalk inbreds. Excellent yields were achieved with the stiff stalk commercial inbreds TR2040 and MBS1236 and the non-stiff stalk commercial inbred LH176.Key words: Corn, maize, Zea mays, cultivar description

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.

MOLYBDENUM, COBALT AND BORON UPTAKE FROM SEWAGE-SLUDGE-AMENDED SOILS

1985 ◽  
Vol 65 (3) ◽  
pp. 507-517 ◽  
Author(s):  
Y. K. SOON ◽  
T. E. BATES
Keyword(s):  
Zea Mays ◽  
Sewage Sludge ◽  
Key Words ◽  
Field Experiments ◽  
Zea Mays L ◽  
Plant Tissues ◽  
Boron Uptake ◽  
Lime Sludge ◽  
Co Concentrations ◽  
Sludge Application

Molybdenum, Co and B concentrations in, and uptake by, corn and bromegrass were measured over a period of several years from three field experiments in which sewage sludge was applied and compared with ammonium nitrate as a source of N. There was little effect of sludge on B and Co concentrations in the crops grown. Slight increases in uptake were apparently due to yield increases due to sludge. A lime-treated sludge increased Mo concentration in plant tissues after several years of sludge application. The increase in plant Mo concentration was highest in the eighth and last year of the experiments, although lime-sludge application had ceased 1–3 yr previously. The soil-sludge interactions contributing to increased Mo uptake are discussed. Key words: Molybdenum, cobalt, boron, sewage sludge, corn (Zea mays L.), bromegrass (Bromus inermiss Leyss).

Corn Inbred Line CG102

2001 ◽  
Vol 81 (3) ◽  
pp. 455-456 ◽  
Author(s):  
E. A. Lee ◽  
B. Good ◽  
R. Chakravarty ◽  
L. Kannenberg
Keyword(s):  
Zea Mays ◽  
Key Words ◽  
Inbred Line ◽  
Zea Mays L ◽  
Cultivar Description ◽  
Corn Inbred

CG102 is short seasoned corn (Zea mays L.) inbred line. Key words: Corn, Zea mays L., cultivar description

Detection of the time of occurrence of nondisjunction induced by the r-X1 deficiency in Zea mays L.

Genome ◽  
1987 ◽  
Vol 29 (5) ◽  
pp. 782-785 ◽  
Author(s):  
Kevin D. Simcox ◽  
Jeffery D. Shadley ◽  
David F. Weber
Keyword(s):  
Zea Mays ◽  
Key Words ◽  
Zea Mays L ◽  
Embryo Sac ◽  
Mitotic Division ◽  
Polar Nucleus ◽  
Chromosome 6 ◽  
High Frequencies ◽  
The Third ◽  
Β Carotene

The r-X1 deficiency in maize produces high frequencies of aneuploid progeny by inducing nondisjunction during embryo sac development. The purpose of this investigation was to determine the embryo sac division at which the nondisjunctive event takes place. Monosomic-6 individuals were generated by crossing r-X1 containing plants by those carrying the y-pastel-8549 allele of the Y locus on chromosome 6. A strict dosage relationship exists between the number of dominant alleles of the Y locus and the level of β-carotene in the endosperm. We found that the level of β-carotene in the endosperm of kernels containing monosomic-6 embryos was comparable with that found in endosperms with one Y allele. This indicated that they contained only one maternally contributed chromosome 6. Only nondisjunction at the second postmeiotic division could have produced such an endosperm; thus, the nondisjunctive event occurs at this division. Another endosperm type expected from nondisjunction at this same division, with three dominant Y alleles, was not found. The absence of this endosperm type suggests that the egg nucleus and the polar nucleus originating at the micropylar pole are sister nuclei that arose from the same cell at the third embryo sac mitotic division. Key words: aneuploidy, embryo sac, nondisjunction, r-X1 deficiency, Zea.

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