scholarly journals Ultrastructural analysis of female pachynema and the relationship between synaptonemal complex length and crossing-over in zea mays

1977 ◽  
Vol 42 (6) ◽  
pp. 475-497 ◽  
Author(s):  
H. Lloyd Mogensen
Keyword(s):  
Zea Mays ◽  
Synaptonemal Complex ◽  
Ultrastructural Analysis ◽  
Crossing Over ◽  
The Relationship ◽  
Complex Length

The relationship between synaptonemal complex length and genome size in four vertebrate classes (Osteicthyes, Reptilia, Aves, Mammalia)

1994 ◽  
Vol 2 (2) ◽  
pp. 153-162 ◽  
Author(s):  
Daniel G. Peterson ◽  
Stephen M. Stack ◽  
Joseph L. Healy ◽  
Bryon S. Donohoe ◽  
Lorinda K. Anderson
Keyword(s):  
Synaptonemal Complex ◽  
Genome Size ◽  
The Relationship ◽  
Complex Length

The relationship between genome size and synaptonemal complex length in higher plants

1985 ◽  
Vol 156 (2) ◽  
pp. 367-378 ◽  
Author(s):  
L ANDERSON ◽  
S STACK ◽  
M FOX ◽  
Z CHUANSHAN
Keyword(s):  
Synaptonemal Complex ◽  
Genome Size ◽  
Higher Plants ◽  
The Relationship ◽  
Complex Length

scholarly journals The Structure and Paramutagenicity of the R-marbled Haplotype of Zea mays

Genetics ◽  
1999 ◽  
Vol 153 (2) ◽  
pp. 979-991 ◽  
Author(s):  
Tadas Panavas ◽  
Jessica Weir ◽  
Elsbeth L Walker
Keyword(s):  
Zea Mays ◽  
Transposable Element ◽  
Copy Number ◽  
Gene Copy Number ◽  
Gene Copy ◽  
Crossing Over ◽  
Direct Repeats ◽  
Pigmentation Pattern ◽  
R1 Gene ◽  
Distal Gene

Abstract Paramutation is the meiotically heritable silencing of a gene that can occur in particular heterozygous combinations. The R-marbled (R-mb) haplotype is paramutagenic: it causes paramutable r1 haplotypes like R-r to become heritably silenced. R-mb was found to comprise three distinct r1 genes arranged as direct repeats. The most distal gene of R-mb, Scm, contains a novel transposable element, Shooter (Sho). Excision of the Sho element early in aleurone development results in the characteristic “marbled” aleurone pigmentation pattern conferred by R-mb. The effect of gene copy number on the paramutagenic strength of R-mb was tested. Paramutagenic strength of R-mb is directly correlated with r1 gene copy number. Paramutagenic strength of R-mb is directly correlated with r1 gene copy number. Paramutagenic strength of R-mb was not affected by removal, through crossing over, of the Sho transposon. Finally, R-mb does not appear to contain the transposable element, Doppia, which is associated with paramutability of R-r, and has been suggested to play a role in paramutagenicity of another paramutagenic haplotype, R-stippled.

The relationship between genetic and cytogenetic maps of pea. I. Standard and translocation karyotypes

Genome ◽  
1997 ◽  
Vol 40 (5) ◽  
pp. 744-754 ◽  
Author(s):  
K. J. Hall ◽  
J. S. Parker ◽  
T. H. N. Ellis
Keyword(s):  
Linkage Map ◽  
Synaptonemal Complex ◽  
Chromosome Rearrangement ◽  
Translocation Line ◽  
Mitotic Chromosomes ◽  
Cytogenetic Map ◽  
Cytogenetical Study ◽  
Meiotic Analysis ◽  
Translocation Karyotypes ◽  
The Relationship

A detailed cytogenetical study of inbred lines of pea and their F1 hybrids has been undertaken to study the relationship between the cytogenetic map and the molecular linkage map. The mitotic karyotypes of a standard pea line, JI15, a translocation line, JI61, and line JI281, a line used in the production of a mapping population, are given. A chromosome rearrangement detected by cytogenetic analysis of mitotic chromosomes has been further defined by synaptonemal complex (SC) analysis and the study of metaphase I chromosome behaviour. This meiotic analysis has allowed a comparison of SC physical lengths, observed chiasma frequencies, and recombination frequencies, as estimated from the genetic map, as a means of comparing physical and genetic distances.Key words: Pisum, linkage map, cytogenetics, chromosome rearrangement, synaptonemal complex.

Maize and Mississippian Beginnings

2017 ◽  
Author(s):  
Amber M. Vanderwarker ◽  
Dana N. Bardolph ◽  
C. Margaret Scarry
Keyword(s):  
Zea Mays ◽  
Social Systems ◽  
Plant Production ◽  
Cultural Tradition ◽  
Central Feature ◽  
Long Distance ◽  
Regional Patterns ◽  
Production And Consumption ◽  
Definition Of ◽  
The Relationship

The adoption and intensification of maize (Zea mays) farming has long been a topic of interest in Mississippian archaeology. At various times throughout the development and definition of “Mississippian” as a cultural tradition, maize has been cast as a central feature of Mississippian adaptation, alongside a suite of other traits that include long-distance exchange, platform mound building, and the development of ranked social systems. In (re-)considering the topic of Mississippian beginnings, we continue to interrogate the nature of the relationship between maize farming and Mississippian origins. Our archaeological review of regional patterns of plant production (archaeobotanical results) and plant consumption (isotopic results) reveals that Mississippians throughout southeastern and midwestern North America produced and consumed maize, but varied significantly in their levels of production and consumption.

Moisture and Rupture Models for Corn (Zea mays) Seeds of Different Endosperm Types

2019 ◽  
Vol 62 (4) ◽  
pp. 913-918
Author(s):  
Arturo Mancera-Rico ◽  
Gabino García-de-los-Santos ◽  
Hilda A. Zavaleta-Mancera ◽  
José A. Carrillo-Salazar ◽  
Elizabeth González-Estrada ◽  
...  
Keyword(s):  
Zea Mays ◽  
Compression Strength ◽  
Rupture Strength ◽  
Mechanical Damage ◽  
Economic Loss ◽  
Corn Seed ◽  
Floury Endosperm ◽  
Rupture Energy ◽  
Postharvest Handling ◽  
The Relationship

Abstract. Mechanization of postharvest handling and conditioning inflicts damage on the physical, physiological, and sanitary qualities of corn (Zea mays) seeds, resulting in significant economic loss. The mechanical damage is related to the compression strength and strain, and therefore to the moisture content (MC) and endosperm type. This study was conducted from 2012 to 2014 at the Montecillo and Chapingo agricultural institutes in Mexico, where physical properties such as volumetric weight; apparent density; rupture compression strength, strain, and energy; and endosperm type were evaluated for five corn seed cultivars (floury, semi-floury, floury-flint, semi-flint, and flint) at seven MC levels (8%, 12%, 16%, 20%, 24%, 28%, and 32% w.b.). The aim of this study was to develop moisture-strength, moisture-strain, and moisture-energy regression models for postharvest handling of corn to prevent quality loss due to mechanization. For three model groups, the relationship (1) between MC and rupture strain was linear and directly proportional for the five studied cultivars; (2) between MC and rupture strength was linear and directly proportional for the floury cultivar, inverse for the semi-flint and flint cultivars, and quadratic for the semi-floury and floury-flint cultivars; and (3) between MC and rupture energy was linear and directly proportional for the floury cultivar and quadratic for the semi-floury, floury-flint, semi-flint, and flint cultivars. The models obtained in this study might be used as a reference for better handling of corn seeds, as none of the five studied varieties had a uniformly superior rupture strength, strain, or energy at the studied MC levels. Floury endosperm types might be handled at high MC and flint endosperm types might be handled at low MC to avoid mechanical damage produced by static loads; both types of endosperm support greater energy loads, e.g., impact, at higher MC. Keywords: Compression, Corn quality, Flint endosperm, Floury endosperm, Moisture, Zea mays.

Novel Investigation of the Deep Band of the Lateral Plantar Aponeurosis and Its Relationship With the Lateral Plantar Nerve

2019 ◽  
Vol 40 (11) ◽  
pp. 1325-1330
Author(s):  
Cameron M. Beck ◽  
Austin R. Dickerson ◽  
Kevin J. Kadado ◽  
Zachary A. Cohen ◽  
Somer E. Blair ◽  
...  
Keyword(s):  
Anatomical Study ◽  
Crossing Over ◽  
Medial Aspect ◽  
Precise Location ◽  
Target Zone ◽  
Plantar Aponeurosis ◽  
Lateral Plantar Nerve ◽  
Relationship Of ◽  
Clinical Potential ◽  
The Relationship

Background: We describe a thick fascial band arising from the medial aspect of the lateral plantar aponeurosis diving deep into the forefoot crossing over a branch of the lateral plantar nerve. Because a review of current literature resulted in limited and outdated sources, we sought to first determine the frequency of this fascial band and the location where it crosses the lateral plantar nerve and, second, discuss the clinical applications these anatomical findings could have. Methods: 50 pairs of cadaveric feet (n = 100) were dissected to investigate for presence of the fascial band and its interaction with the lateral plantar nerve. Images were taken of each foot with the fascial band. ImageJ was used to take 2 measurements assessing the relationship of the tuberosity of the base of the fifth metatarsal to where the nerve crossed deep to the fascial band. Results: Overall, 38% of the feet possessed the fascial band. It was found unilaterally in 10 pairs and bilaterally in 14 pairs. On average, the point at which the lateral plantar nerve passed deep to the fascial band was 2.0 cm medial and 1.7 cm anterior to the tuberosity of the base of the fifth metatarsal. Conclusion: When present, the deep band of the lateral plantar aponeurosis (PA) was consistently found to be crossing the lateral plantar nerve. The discovery of the location where this most commonly occurs has not been previously reported and adds an interesting dimension that elevates an anatomical study to one that has clinical potential. Clinical Relevance: The established target zone gives a precise location for where the relationship between the deep band of the lateral PA and the lateral plantar nerve exists when evaluating the foot. The target zone provides a potential springboard for future investigations concerning said relationship clinically.

scholarly journals The relationship between genetic and physical distances in the cloned a1-sh2 interval of the Zea mays L. genome.

1994 ◽  
Vol 91 (17) ◽  
pp. 8268-8272 ◽  
Author(s):  
L. Civardi ◽  
Y. Xia ◽  
K. J. Edwards ◽  
P. S. Schnable ◽  
B. J. Nikolau
Keyword(s):  
Zea Mays ◽  
Zea Mays L ◽  
The Relationship
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