THE EFFECT OF TELOMERIC HETEROCHROMATIN FROM SECALE CEREALE ON TRITICALE (X TRITICOSECALE). II. THE PRESENCE OR ABSENCE OF BLOCKS OF HETEROCHROMATIN IN ISOGENIC BACKGROUNDS

1982 ◽  
Vol 24 (1) ◽  
pp. 93-100 ◽  
Author(s):  
M. D. Bennett ◽  
J. P. Gustafson
Keyword(s):  
Secale Cereale ◽  
Chromosome Pair ◽  
Endosperm Development ◽  
Early Embryo ◽  
Kernel Weight ◽  
Yield Increase ◽  
Heterochromatin Block ◽  
Secale Cereale L ◽  
Telomeric Heterochromatin ◽  
Triticosecale Wittmack

The influence of telomeric heterochromatin blocks on early embryo and endosperm development, and on various agronomic parameters seen at maturity, was investigated using triticales (× Triticosecale Wittmack) isogenic for the presence or absence of the heterochromatin blocks on rye (Secale cereale L.) chromosomes 6R and 7R/4R. Absence of the telomeric heterochromatin blocks from the long arm of rye chromosome pair 7R/4R in DRIRA, and from the short arm of rye chromosome pair 6R in Rosner was significantly related with a lower production of aberrant endosperm nuclei and an increased kernel weight. The loss of the heterochromatin block on rye chromosome pair 7R/4R in DRIRA resulted in a significant yield increase, while there was no increase in yield when the heterochromatin block was missing from rye chromosome pair 6R in Rosner. The lack of yield increase in Rosner was apparently due to a significant decrease in fertility when the heterochromatin block on 6R was lost. The loss of the heterochromatin block on the short arm of rye chromosome 6R appears to have the same effect on aberrant endosperm nuclei production and kernel weight in two different genetic backgrounds. The rate of embryo and endosperm development showed a small but significant increase when the heterochromatin blocks were lost from both 6R and 7R/4R.

THE EFFECT OF TELOMERIC HETEROCHROMATIN FROM SECALE CEREALE ON TRITICALE (× TRITICOSECALE). I. THE INFLUENCE OF THE LOSS OF SEVERAL BLOCKS OF TELOMERIC HETEROCHROMATIN ON EARLY ENDOSPERM DEVELOPMENT AND KERNEL CHARACTERISTICS AT MATURITY

1982 ◽  
Vol 24 (1) ◽  
pp. 83-92 ◽  
Author(s):  
J. P. Gustafson ◽  
M. D. Bennett
Keyword(s):  
Secale Cereale ◽  
Positive Relationship ◽  
Strong Relationship ◽  
Endosperm Development ◽  
Kernel Weight ◽  
Test Weight ◽  
Spring Triticale ◽  
Secale Cereale L ◽  
Telomeric Heterochromatin ◽  
Triticosecale Wittmack

The relationships between telomeric heterochromatin on rye (Secale cereale L.) chromosomes, the occurrence of aberrant endosperm nuclei early during endosperm development, and kernel characteristics as seen at maturity were investigated in hexaploid spring triticale (× Triticosecale Wittmack). A positive relationship was established between the presence of telomeric heterochromatin on the short arms of rye chromosomes 4R/7R and 6R, and the production of aberrant endosperm nuclei. The removal of telomeric heterochromatin blocks from either 4R/7R or 6R significantly reduced the occurrence of nuclear instability in endosperm, and the effect of losing more than one block of telomeric heterochromatin was additive. A strong relationship was also noted between the absence of telomeric heterochromatin blocks on the short arms of rye chromosomes 4R/7R and 6R, and both higher thousand kernel weight and test weight at maturity. This relationship was also additive depending on whether one or two blocks of telomeric heterochromatin were missing. The absence of telomeric heterochromatin blocks on 4R/7R and 6R was significantly related with increased yield. The results show that amount of telomeric heterochromatin on some rye chromosomes is closely related to the occurrence of aberrant endosperm nuclei early during endosperm development and kernel characteristics at maturity.

The effect of telomeric heterochromatin on the frequency of aneuploids in triticale (× Triticosecale)

1984 ◽  
Vol 26 (1) ◽  
pp. 46-49 ◽  
Author(s):  
J. E. Dillé ◽  
J. P. Gustafson ◽  
M. D. Bennett
Keyword(s):  
Secale Cereale ◽  
Chromosome Pair ◽  
Wheat Chromosome ◽  
Control Population ◽  
Secale Cereale L ◽  
Telomeric Heterochromatin ◽  
Triticosecale Wittmack ◽  
The Relationship

The relationship between the frequency of aneuploids and blocks of telomeric heterochromatin on rye (Secale cereale L.) chromosomes in a triticale (× Triticosecale Wittmack) background was investigated. Lines with or without blocks of telomeric heterochromatin were examined to determine the percentage of aneuploid progeny. The results showed that the amount of telomeric heterochromatin present on rye chromosomes 4R and 6R had little effect (2%) on lowering the proportion of aneuploids. When rye chromosome pair 2R was replaced by wheat chromosome 2D in the presence of chromosomes 4R and 6R lacking heterochromatin, the percentage of aneuploids increased slightly (2.7%) over that found in the control population.

Heterochromatin content and early endosperm development in 42-chromosome spring triticale

1984 ◽  
Vol 26 (1) ◽  
pp. 85-90 ◽  
Author(s):  
J. P. Gustafson ◽  
A. J. Lukaszewski ◽  
B. Skovmand
Keyword(s):  
Genetic Factors ◽  
Endosperm Development ◽  
Test Weight ◽  
Subsequent Test ◽  
Wheat Improvement ◽  
Spring Triticale ◽  
Secale Cereale L ◽  
Telomeric Heterochromatin ◽  
Triticosecale Wittmack ◽  
Heterochromatin Content

An analysis of several triticales (× Triticosecale Wittmack) from the International Maize and Wheat Improvement Center (CIMMYT) breeding program showed a strong correlation (r = 0.97, p ≤ 0.01) between test weight and the frequency of aberrant-nucleus formation in early endosperm development. The measurements of rye (Secale cereale L.) heterochromatin content indicated that, as compared with an average rye, in substituted triticales it was reduced by 21.4–49.8% and by 9.3 and 30% from that of two complete rye genome triticales analyzed. No correlation was observed between gross heterochromatin content and frequency of aberrant endosperm nucleus production and (or) test weight. However, both percentage heterochromatin and the production of aberrant endosperm nuclei were greatly reduced as compared with the average triticale previously analyzed. In addition, significant correlations were observed between the frequency of aberrant endosperm nuclei and the amount of telomeric heterochromatin on chromosomes 5R (r = −0.60, p ≤ 0.10) and 6R (r = 0.76, p ≤ 0.05). These results suggest that the presence or absence of telomeric heterochromatin on different rye chromosomes on triticale may have different effects on the regularity of early endosperm development and subsequent test weight at maturity. Furthermore, once the total amount of telomeric heterochromatin present on rye chromosomes was greatly reduced it appeared that other genetic factors became visibly involved in irregularities of endosperm development.

Relationship between extract viscosity and kernel size in winter rye

1998 ◽  
Vol 78 (3) ◽  
pp. 423-427
Author(s):  
Y. T. Gan ◽  
J. G. McLeod ◽  
G. J. Scoles ◽  
G. L. Campbell
Keyword(s):  
Secale Cereale ◽  
Kernel Weight ◽  
Selection Strategy ◽  
Winter Rye ◽  
Kernel Size ◽  
Kernel Width ◽  
Secale Cereale L ◽  
The Relationship ◽  
Efficient Selection ◽  
Selection Of

Rye (Secale cereale L.) grain with low extract viscosity (EV) and superior kernel characteristics is desired when used in diets of monogastric animals. Knowledge of the relationship between EV and kernel characteristics is needed to develop an efficient selection strategy for breeding cultivars that meet the two criteria. Grains of 11 open-pollinated population varieties/lines grown in 21 environments were studied to determine the relationship between EV and kernel weight (KWT) among genotypes and environmental effects. Grains of eight out of the eleven varieties/lines were screened into five kernel-size categories, <2.0, 2.0–2.4, 2.4–2.8, 2.8–3.2, >3.2 mm in kernel width, to determine the relationship between EV and kernel width within a genotype. EV was a linear function of KWT; high KWT is indicative of low EV. The degree of the relationship was affected by environment. For example, grains grown at Swift Current had a stronger relationship between EV and KWT than those from Lacombe (b = −1.67 vs. −0.31). For the grain from Swift Current, 60% of variability in EV was attributable to KWT, while for the grain from Lacombe only ≈ 20% of variability in EV was explainable by KWT. Among the various kernel-width categories within a genotype, 60 to 98% of variability in EV was attributable to kernel width, with some genotypes responding to a greater degree than others. In development of winter rye cultivars low in extract viscosity, breeders could combine kernel weight/width into the selection strategy to enhance the selection progress or use kernel weight/width as a reference in selection of extract viscosity trait. Key words: Pentosans, arabinoxylans, kernel weight, Secale cereale

Early seed development in the annual and perennial Secale taxa

1985 ◽  
Vol 27 (2) ◽  
pp. 134-142 ◽  
Author(s):  
J. P. Gustafson ◽  
A. J. Lukaszewski
Keyword(s):  
Seed Development ◽  
Dna Content ◽  
Endosperm Development ◽  
Early Embryo ◽  
Embryo Cell ◽  
Developmental Patterns ◽  
Positive Correlation ◽  
Embryo Cells ◽  
Telomeric Heterochromatin ◽  
Early Seed Development

The early embryo and endosperm development patterns of five annual taxa and three perennial taxa of the genus Secale were analyzed. The results showed that there was considerable variation in the speed of early embryo and endosperm development within the genus Secale, and that the developmental patterns of the annual and perennial taxa overlapped. Comparisons indicated that DNA content per se did not have any influence on the speed of early embryo development or aberrant endosperm nucleus production in either the annual or perennial taxa. However, comparisons between the percent telomeric heterochromatin and the number of embryo cells produced showed a significant positive correlation in the annual taxa, and a nonsignificant correlation in the perennial taxa. There was a positive correlation between the number of aberrant endosperm nuclei and percent telomeric heterochromatin in the annual taxa, while the perennial taxa showed a nonsignificant but negative correlation. The results suggest that percent telomeric heterochromatin has a different effect on early seed development in the annual taxa than in the perennial taxa.Key words: Secale, heterochromatin, DNA content, embryo cell cycle.

Hazlet winter rye

2008 ◽  
Vol 88 (3) ◽  
pp. 527-529 ◽  
Author(s):  
J. G. McLeod ◽  
Y. Gan
Keyword(s):  
Secale Cereale ◽  
Agricultural Research ◽  
Kernel Weight ◽  
Test Weight ◽  
Research Centre ◽  
Winter Rye ◽  
Lodging Resistance ◽  
Canadian Prairies ◽  
Rye Straw ◽  
Secale Cereale L

Hazlet is a cultivar of winter rye (Secale cereale L.), developed at the Semiarid Prairie, Agricultural Research Centre, Research Branch, Agriculture and Agri-Food Canada, Swift Current, SK. Straw of Hazlet is about 10% shorter than tall cultivars such as Prima. Lodging resistance is poorer than AC Rifle and similar to Prima and Dakota. Hazlet has good winter survival and is well adapted to the Canadian Prairies. Kernels are about 16% larger and the test weight is significantly greater than the check cultivars. Grain yield is about 16% grater than that of Prima. Key words: Cultivar description, winter rye, straw strength, reduced plant height, test weight, kernel weight, Secale cereale L.

AC Remington winter rye

2000 ◽  
Vol 80 (3) ◽  
pp. 605-607 ◽  
Author(s):  
J. G. McLeod ◽  
Y. T. Gan ◽  
J. F. Payne
Keyword(s):  
Secale Cereale ◽  
Agricultural Research ◽  
Kernel Weight ◽  
Research Centre ◽  
Winter Rye ◽  
Falling Number ◽  
Lodging Resistance ◽  
Canadian Prairies ◽  
Secale Cereale L ◽  
Hagberg Falling Number

AC Remington, a cultivar of winter rye (Secale cereale L.), was developed at the Semiarid Prairie Agricultural Research Centre, Research Branch, Agriculture and Agri-Food Canada, Swift Current, Saskatchewan. AC Remington is a semidwarf with 20 to 25% shorter straw and improved lodging resistance compared with tall cultivars. AC Remington has good winter survival and is well adapted to the Canadian Prairies. AC Remington has improved grain yield, test weight, kernel weight and Hagberg Falling Number compared with those of the semidwarf cultivar AC Rifle. Plant height, heading, maturity and ergot infection of AC Remington are similar to those of AC Rifle. Key words: Cultivar description, semidwarf, rye (winter), Hagberg Falling Number, Secale cereale L.

DANKO WINTER RYE

1986 ◽  
Vol 66 (4) ◽  
pp. 997-998 ◽  
Author(s):  
J. E. LANGILLE ◽  
H. G. NASS ◽  
J. S. BUBAR ◽  
R. W. JONES ◽  
R. B. WALTON
Keyword(s):  
Plant Breeding ◽  
Secale Cereale ◽  
Kernel Weight ◽  
Winter Survival ◽  
Winter Rye ◽  
Lodging Resistance ◽  
Plant Breeding Institute ◽  
Secale Cereale L ◽  
Cultivar Description ◽  
Breeder Seed

Danko is a winter rye (Secale cereale L.) cultivar with higher yield, better lodging resistance and winter survival and higher kernel weight and test weight than Animo and Kustro, the current most commonly grown cultivars in the Maritimes. It was developed at the Polish Plant Breeding Institute, Poznan, Poland where breeder seed will be maintained. Seed will be distributed by King Grain Ltd.Key words: Secale cereale L., rye (winter), cultivar description

scholarly journals PAIRING COMPETITION BETWEEN IDENTICAL AND HOMOLOGOUS CHROMOSOMES IN RYE AND GRASSHOPPERS

Genetics ◽  
1983 ◽  
Vol 104 (4) ◽  
pp. 677-684
Author(s):  
J L Santos ◽  
J Orellana ◽  
R Giraldez
Keyword(s):  
Secale Cereale ◽  
Banding Pattern ◽  
Chromosome Pair ◽  
Meiotic Pairing ◽  
Homologous Pairing ◽  
Eyprepocnemis Plorans ◽  
Homologous Chromosomes ◽  
Random Pairing ◽  
Structural Differences ◽  
Telomeric Heterochromatin

ABSTRACT Meiotic pairing preferences between identical and homologous but not identical chromosomes were analyzed in spontaneous tetraploid/diploid chimeras of three male grasshoppers (Eyprepocnemis plorans) whose chromosome pair 11 were heterozygous for C-banding pattern and in four induced tetraploid/diploid chimaeral rye plants (Secale cereale) heterozygous for telomeric heterochromatin C-bands in chromosomes 1R and 2R. In the grasshoppers, a preference for identical over homologous pairing was observed, whereas in rye both a preference for homologous rather than identical pairing and random pairing between the four chromosomes of the set was found. From the results in rye, it can be deduced that pairing preferences do not depend exclusively on the similarities between chromosomes involved. It is suggested that genotypic or cryptic structural differences between the homologous chromosomes of each pair analyzed might be responsible for the pairing preferences found. This hypothesis can also explain the results obtained in grasshoppers, although the possibility of premeiotic association cannot be excluded in this material.

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