Hordeum chilense (2n = 14) computer-assisted Giemsa karyotypes

Genome ◽  
1987 ◽  
Vol 29 (5) ◽  
pp. 683-688 ◽  
Author(s):  
K. C. Armstrong ◽  
Iris L. Craig ◽  
C. Merritt
Keyword(s):  
Key Words ◽  
Chromosome Banding ◽  
Hordeum Chilense ◽  
Computer Assisted ◽  
Banding Patterns ◽  
Software Program

The Giemsa karyotype of three accessions of Hordeum chilense Roem. and Schult were studied in detail. The idiograms were developed using a computer-assisted software program that contained the ability to straighten and measure chromosomes. Distinctive banding patterns were formed on each of the seven chromosome pairs, which in conjunction with length and arm ratio allowed the identification of each chromosome. Some differences in the banding patterns of the accessions were noted. Key words: Hordeum, chromosome banding.

CHROMOSOME STRUCTURE IN CHILOCORUS (COLEOPTERA: COCCINELLIDAE). II. THE ASYNCHRONOUS REPLICATION OF CONSTITUTIVE HETEROCHROMATIN

1976 ◽  
Vol 18 (1) ◽  
pp. 85-91 ◽  
Author(s):  
T. J. Ennis
Keyword(s):  
Chromosome Banding ◽  
Chromosome Structure ◽  
Constitutive Heterochromatin ◽  
Chromosome Replication ◽  
Data Models ◽  
Late Replication ◽  
Banding Patterns ◽  
Asynchronous Replication ◽  
Chilocorus Stigma

Chromosome replication has been analysed in four species of Chilocorus. In C. orbus Csy., C. tricyclus Smith, and C. hexacyclus Smith, centric regions of all chromosomes are last to replicate, preceded in order by heterochromatic arms and euchromatic arms. In C. stigma Say, very late replication of centric regions can be detected only in otherwise wholly euchromatic chromosomes (= monophasics); in chromosomes with one arm heterochromatic (= diphasics), these arms are last to replicate. Based on pachytene bivalent morphology and chromosome banding patterns, and supported by autoradiographic data, models are presented for the general organisation of Chilocorus chromosomes. All chromosomes in the first three species are subdivided into euchromatic arm, centric heterochromatin, and either a second euchromatic arm (monophasics) or a heterochromatic arm (diphasics). Chilocorus stigma diphasics apparently lack distinct centric organisation, and are therefore divided into euchromatic and heterochromatic arms only.

Rye C-banding patterns and meiotic stability of hexaploid triticale (× Triticosecale) selections differing in kernel shriveling

Genome ◽  
1990 ◽  
Vol 33 (5) ◽  
pp. 686-689 ◽  
Author(s):  
Charles M. Papa ◽  
R. Morris ◽  
J. W. Schmidt
Keyword(s):  
Secale Cereale ◽  
Chromosome Banding ◽  
Agronomic Performance ◽  
Hexaploid Triticale ◽  
Kernel Development ◽  
Banding Patterns ◽  
C Banding ◽  
Meiotic Stability ◽  
Metaphase I

Two winter hexaploid triticale populations derived from the same cross were selected on the basis of grain appearance and agronomic performance. The five lines from 84LT402 showed more kernel shriveling than the four lines from 84LT401. The derived lines were analyzed for aneuploid frequencies, rye chromosome banding patterns, and meiotic stability to detect associations with kernel development. The aneuploid frequencies were 16% in 84LT401 and 18% in 84LT402. C-banding showed that both selection groups had all the rye chromosomes except 2R. The two groups had similar telomeric patterns but differed in the long-arm interstitial patterns of 4R and 5R. Compared with lines from 84LT402, those from 84LT401 had significantly fewer univalents and rod bivalents, and more paired arms at metaphase I; fewer laggards and bridges at anaphase I; and a higher frequency of normal tetrads. There were no significant differences among lines within each group for any meiotic character. Since there were no differences within or between groups in telomeric banding patterns, the differences in kernel shriveling and meiotic stability might be due to genotypic factors and (or) differences in the interstitial patterns of 4R and 5R. By selecting plump grains, lines with improved kernel characteristics along with improved meiotic stability are obtainable.Key words: triticale, meiotic stability, C-banding, Secale cereale, heterochromatin.

Computer-Assisted Learning in Professional Forestry Education at the University of New Brunswick

1987 ◽  
Vol 63 (5) ◽  
pp. 356-359
Author(s):  
G. A. Jordan
Keyword(s):  
New Brunswick ◽  
Key Words ◽  
Forest Resources ◽  
Computer Assisted ◽  
Computer Assisted Learning ◽  
Forestry Education ◽  
Self Discovery ◽  
The University ◽  
Ongoing Support

The Computer-Assisted Learning (CAL) experiences of the Department of Forest Resources at the University of New Brunswick are described. The paper defines the principal benefit of CAL as better students rather than better teaching and states that CAL has contributed to the former by enhancing learning in three important ways: (i) new subjects, not possible before, have been introduced; (ii) certain topics have been dealt with more often; (iii) the delivery of some subjects has been better managed. The paper continues with a discussion of three strategies that were successfully employed in implementing the CAL programme. These strategies are (1) the programme emphasized heuristic CAL activities: probelm-solving, self-discovery and "what-if" learning, as opposed to drill and tutorial exercises: (2) the programme was committed to developing and maintaining appropriate CAL infrastructure: a dedicated and fully equipped CAL laboratory, plus the ongoing support of a CAL specialist to assist and educate faculty in integrating and implementing CAL techniques and. avoid reliance upon imported, often inappropriate, courseware; (3) in a limited funding situation the programme deliberately traded microcomputer quality for quantity, thus maximizing number of students accommodated. The paper concludes with a description of several CAL examples taken from undergraduate courses currently offered at the Faculty of Forestry. Key words: computer-assisted learning, forestry education.

Chromosome Banding Patterns in Squirrel Monkeys (Saimiri sciureus)

1974 ◽  
Vol 3 (2) ◽  
pp. 120-137 ◽  
Author(s):  
N.S.F. Ma ◽  
T.C. Jones ◽  
R.W. Thorington ◽  
R.W. Cooper
Keyword(s):  
Chromosome Banding ◽  
Squirrel Monkeys ◽  
Saimiri Sciureus ◽  
Banding Patterns

scholarly journals Studies on the genetic diversity of pointed gourd using biochemical methods (Isozyme analysis)

1970 ◽  
Vol 34 (1) ◽  
pp. 123-141
Author(s):  
ASMMR Khan ◽  
MG Rabbani ◽  
MA Siddique ◽  
MA Islam
Keyword(s):  
Genetic Diversity ◽  
Acid Phosphatase ◽  
Key Words ◽  
Glutamate Oxaloacetate Transaminase ◽  
Banding Patterns ◽  
Biochemical Methods ◽  
Electrophoretic Patterns ◽  
Wide Range ◽  
Rf Values ◽  
Pointed Gourd

Biochemical characterizations of 64 pointedgourds were done using three isozyme viz., acid phosphatase, peroxidase and glutamate oxaloacetate transaminase. A wide range of diversity among the gremplasm based on their acid phosphatase, peroxidase and glutamate oxaloacetate transaminase isoenzyme banding patterns were observed. In respect of isoenzyme activity; 8 acid phosphatase, 7 peroxidase and 9 glutamate oxaloacetate transminase electrophoretic zymotypes were formed by 19, 11, and 19 bands at different Rf values varying from 0.19 to 0.82, 0.38 to 0.69 and 0.15 to 0.95, respectively. The wide range of similarity co-efficient of 0.0-80.0, 0.0-66.0, and 0.0-80.0 as found among the electrophoretic patterns in acid phosphatase, peroxidase, and glutamate oxaloacetate transminase, respectively, indicating wide genetic diversity among the accessions. Based on the polymorphic activity of these three enzymes, 27 combinations of electrophoretic zymotypes were identified, each of which can he equated to genotypes. Each of the groups consisted of one to eight genotypes. Sixty four accessions of pointed gourd were grouped into 12 clusters. The genotypes collected from the same location were grouped into different clusters. Key Words: Genetic diversity; pointed gourd; biochemical methods. DOI: 10.3329/bjar.v34i1.5762Bangladesh J. Agril. Res. 34(1) : 123-141, March 2009

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