Maintenance of interchange heterozygosity in cultivated rye, Secale cereale L.

Candela, M.; Figueiras, A. M.

doi:10.1038/hdy.1979.31

Cited by 23 publications

(10 citation statements)

References 9 publications

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“…Ailés known from previous studies (Candela et at., 1979(Candela et at., , 1982Figueiras et al, 1983). Translocations were detected in two of 37 line A donors.…”

Section: Discussionmentioning

confidence: 85%

“…Ailés which contains reciprocal translocations (interchanges) (Candela et a!., 1979(Candela et a!., , 1982Figueiras et a!., 1983 Tissue cu/ture and p/ant regeneration Embryos were dissected irom green seeds of two to three heads per donor plant within 4 weeks after pollination. After ripening the remaining heads were harvested.…”

Section: Growth Of Donor P/ant Materialsmentioning

confidence: 99%

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Effect of genotype on chromosome variation in tissue culture of inbred and outbred rye

Puolimatka

Karp

1993

Heredity

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To examine the effect of genotype on the nature of the cytological variation induced in culture, plants were regenerated from cultured immature embryos of six genotypes (lines A-F) of rye (Secale cereale L.). The variation observed differed among the six lines and was generally consistent with the donors. Regenerants of line A were consistent with the donor, cv. Ailés, in that chromosome translocations appeared at high frequencies. No structural or numerical variation was observed in the B chromosomes of line B. Two of the four inbred lines studied were very stable in culture. Inbred line D was also stable except for a translocation in the regenerants. In inbred line F, variation was observed in the donors and the regenerants. An examination of chiasma frequency and distribution indicated that the regenerated plants generally had higher chiasma frequencies and more distally localized chiasmata than the donors. Line F was exceptional in that the regenerants had more interstitial chiasmata. The elevation in chiasma frequency was not as great, or statistically as significant, as the change in distribution. These results provide further evidence that the nature of cytological variation observed in regenerated plants is genotype-dependent and that, in addition to numerical and structural chromosome variation, shifts in chiasma frequency and distribution, and therefore in genetic recombination, can occur as a result of somaclonal variation.

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“…Ailés known from previous studies (Candela et at., 1979(Candela et at., , 1982Figueiras et al, 1983). Translocations were detected in two of 37 line A donors.…”

Section: Discussionmentioning

confidence: 85%

Section: Growth Of Donor P/ant Materialsmentioning

confidence: 99%

Effect of genotype on chromosome variation in tissue culture of inbred and outbred rye

Puolimatka

Karp

1993

Heredity

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“…According to Burnham (1956) the high frequency of chains is attributed to either extremely short interchange pieces, or early terminalisation of chiasmata or chiasma failure in one of the arms during meiosis of structural heterozygotes. Reciprocal translocations have been considered to be an important genetic aberration for both geneticists and plant breeders as these are the sources of intraspecific chromosomal structural polymorphism (Candela et al 1979). Presently, multiple associations of chromosomes have been found in Chaerophyllum acuminatum and C. aromaticum, where chromosomes are associated to form rings and chains during M-I.…”

Section: Discussionmentioning

confidence: 99%

Impaired Male Meiosis and Multiple Associations in <i>Chaerophyllum</i> L. from the Western Himalayas, India

Kumar¹,

Kumari

Gupta

2015

CYTOLOGIA

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SummaryWe present a cytological study of species of the genus Chaerophyllum L. (Apiaceae) by analysing five accessions covering three species from the Western Himalayas, India. The species are collected and studied for detailed male meiosis, multiple associations and pollen fertility. All the studied species exist at diploid level (based on x=11), and show a meiotic chromosome count of 2n=22 at diakinesis and metaphase-I, and regular chromosome distributions at anaphases-I/II. C. aromaticum is reported for the first time from India and found to be in conformity with the earlier reports of 2n=22 from outside India. Out of three studied species, two (C. acuminatum and C. aromaticum) showed the presence of multiple chromosomal associations at metaphase-I of meiosis-I. The paper herein discusses for the first time the occurrence of multiple associations in these species. The course of meiosis in all studied species shows impaired meiotic course in the form of cytomixis, chromatin stickiness, laggards and chromatin bridges. Abnormal microsporogenesis results in heterogeneous-sized pollen grains and reduced pollen fertility.

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“…(b) Chromosomal polymorphism due to many different reciprocal translocations (Candela et a!., 1979 Mansilla (1980) and Ailés (1979), showed a frequency of structural heterozygosity of 40 per cent, 98 per cent and 154 per cent, respectively (Candela et al, 1982;Figueiras et al, 1983;González-Jaén eta!., 1985). All the cultivars were reproduced in panmictic and homogeneous conditions in experimental fields.…”

Section: Introductionmentioning

confidence: 99%

Genic heterozygosity maintained by chromosomal interchanges in rye

et al. 1988

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Six different rye cultivars were electrophoretically analysed. Three of them showed chromosome polymorphism for reciprocal translocations at various frequencies, while the other three were chromosomally homogeneous. The cultivars were shown to be polymorphic for isozymes at the loci Got-3, Pgm-1, Gpi-1, Acph, Mdh-l and Mdh-2b. The results obtained seem to indicate that the frequency of polymorphic loci, heterozygosity per locus and mean heterozygosity per cultivar are higher in those cultivars having chromosomal interchanges. In the "Ailés" cultivar, plants homozygous and heterozygous for interchanges were analysed, both in open-and self-pollination. The structural heterozygotes showed a higher genic heterozygosity mainly for the Pgm-1 and Mdh-2b loci. Possible explanations of this phenomenon are discussed.

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Maintenance of interchange heterozygosity in cultivated rye, Secale cereale L.

Cited by 23 publications

References 9 publications

Effect of genotype on chromosome variation in tissue culture of inbred and outbred rye

Effect of genotype on chromosome variation in tissue culture of inbred and outbred rye

Impaired Male Meiosis and Multiple Associations in <i>Chaerophyllum</i> L. from the Western Himalayas, India

Genic heterozygosity maintained by chromosomal interchanges in rye

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