Effects of external environmental factors on chromosome pairing in autotetraploid rye.

Hossain, M. Gul

doi:10.1508/cytologia.43.21

Cited by 14 publications

(9 citation statements)

References 27 publications

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“…In contrast, univalent and trivalent configurations cause irregular meiosis, lowering the number of chiasmata. Similar results have been reported in the frequency of bivalent pairing in the synthetic allotetraploids between perennial and Italian ryegrasses (Evans & Macefield 1974;Bréese & Thomas 1977;1978;Lewis 1980;Bréese et al 1981). Cytogenetic studies on allotetraploid hybrids between perennial and Italian ryegrasses have indicated genotypic differences in the levels of preferential chromosome pairing (Lewis 1980;Bréese et al 1981;Lewis étal.…”

Section: Discussionsupporting

confidence: 84%

“…It can also be concluded that these differences originate from the differences of genotypes of the parent materials and possibly the different environment. Various researchers have reported the effects of environment (Dowrick 1957;Jam 1957;Elliott 1958;Moore 1963;Hossain 1978) and genotype on the level of bivalent association in autotetraploids of some species and allotetraploids between Lolium and Festuca (Rees 1961;Hazarika & Rees 1967;Bréese et al 1981).…”

Section: Discussionmentioning

confidence: 99%

“…Commercial exploitation, however, depends on the uniformity and stability of successive generations (Bréese & Thomas 1977, 1978. Perennial and Italian ryegrasses possess complementary agronomic characters.…”

Section: Introductionmentioning

confidence: 99%

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Meiotic behaviour in reciprocal tetraploid hybrids between perennial and Italian ryegrasses

Deniz

Doğru

2008

New Zealand Journal of Agricultural Research

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Chromosome associations and chiasma frequencies at first metaphase (MI) were studied in allotetraploid reciprocal hybrids between perennial ryegrass (Lolium perenne, Lp) and Italian ryegrass (L. multiflorum, Lm), and parent autotetraploid perennial ryegrass. Preferential chromosome pairings were assessed in Lp x Lm and Lm x Lp hybrids. The reciprocal hybrids were found to have significantly higher frequencies of bivalent pairing and lower frequencies of quadrivalent pairing and chiasmata. The mean frequencies of total bivalents at MI were 6.820, 9.885 and 10.040 and total quadrivalent frequencies were 3.320, 1.775 and 1.760 in the autotetraploid parent and the Lp x Lm and Lm x Lp hybrids, respectively. The frequencies of chiasmata were 25.075, 23.455 and 23.315 in the parent and the Lp × Lm and Lm × Lp hybrids, respectively. The frequencies of preferential chromosome pairing in the Lp × Lm and Lm × Lp hybrids were 42.69 and 44.85%, respectively and the results indicate a significant degree of preferential bivalent association in the hybrids. An inverse relationship was found between the frequency of total bivalent and quadrivalent associations in the parent and the Lp x Lm and Lm x Lp hybrids. These reciprocal hybrids are potentially important breeding materials for developing new hybrid cultivars.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 99%

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Meiotic behaviour in reciprocal tetraploid hybrids between perennial and Italian ryegrasses

Deniz

Doğru

2008

New Zealand Journal of Agricultural Research

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“…It has been generally accepted in a wide range of organisms that temperature is an effective and convenient stimulus for experimentally altering the course of meiotic homologous chromosome pairing, as well as crossing over (Wilson 1959;Henderson 1966;Peacock 1970;Church 1974;Hossain 1978). Such an effect of temperature may be a clue for understanding the regulation system of homologous pairing.…”

Section: Introductionmentioning

confidence: 99%

Reduction of meiotic homologous chromosome pairing due to high temperature in common wheat.

Kato

Yamagata

1980

The Japanese journal of genetics

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Effect of high temperature on meiotic homologous chromosome pairing of common wheat was examined.According to the experimental results, constant high temperature of 30°C significantly reduced homologous pairing compared with 15, 20 and 25°C, and such effect was recognized only when the PMCs of some limited stage immediately before premeiotic S phase were exposed to the temperature.Besides, the high temperature did not affect the pairing of both arms of an isochromosome (lA-long-arm) at all. It was strongly suggested from these results that (1) high temperature of 30°C disturbs the process of pairing at a step which controls premeiotic inter-homologues attraction, creating such a situation as homologues are spatially kept away each other, and (2) this step may closely be connected with a peculiar stage sensitive to the high temperature.A similarity of acting mechanism among high temperature, colchicine and Ph allele was also discussed.

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“…Singh and Gupta (1978), attributed such reduction in chiasma frequency to changes in general metabolism due to temperature. Effects of environmental factors such as temperature on chiasma frequency in plants has also been reported by Hossain (1978) in rye. However, higher values observed in Faint blue during summer at both the phases suggest relatively random distribution of chiasmata possibly due to genetic control of chiasma frequency (Rees 1961), which sometimes may get modified by environmental factors (Myers 1943).…”

Section: Resultsmentioning

confidence: 69%

Meiotic Chromosome Behaviour in Clitoria ternatea L. and C. biflora Dalz.

Gandhi

Patil

1994

CYTOLOGIA

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Effects of external environmental factors on chromosome pairing in autotetraploid rye.

Cited by 14 publications

References 27 publications

Meiotic behaviour in reciprocal tetraploid hybrids between perennial and Italian ryegrasses

Meiotic behaviour in reciprocal tetraploid hybrids between perennial and Italian ryegrasses

Reduction of meiotic homologous chromosome pairing due to high temperature in common wheat.

Meiotic Chromosome Behaviour in Clitoria ternatea L. and C. biflora Dalz.

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