Studies in viola, 1: The cytology of a naturally-occurring population of hybrids betweenViola tricolor L. andViola lutea huds

Fothergill, P. G.

doi:10.1007/bf01654278

Cited by 15 publications

(6 citation statements)

References 18 publications

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“…As the number of plants counted is low, only considerable deviations from randomness could be detected in this way, but the good viability and fertility of plants with different chromosome numbers, in both natural and artificial hybrids show in our opinion that there is hardly any selection against particular chromosome numbers. This phenomenon was reported earlier (Clausen 1926) although Fothergill (1938) found a preponderance of even chromosome numbers in hybrids between the related species I'. tricolor L. and V. Zutea Huds.…”

Section: Resultssupporting

confidence: 52%

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Genecological investigations on zinc plants III. Cytology of hybrids between Viola calaminaria (Lej.) Ernst and Viola arvensis Murr.

Kakes

1980

Genetica

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Natural hybrids between P'T calaminaria ssp. westfalica and V. arvensis have been regularly observed in one population of the former. The parent species have 2n = 34 and 2n = 52 resp. The F1 has 2n = 43, is fertile and, after backcrossing with K calaminaria ssp. westfalica, gives a progeny with a range of chromosome numbers of 2n = 44 to 2n = 52 and an approximately binomial distribution. The progenies of open pollinated natural hybrids have a range of 2n = 40 to 2n = 65 in all the progenies examined together. The cytological data are in good agreement with the morphological ones, all suggesting that natural hybrids are the result of selling and/or backcrossing to V. calaminaria ssp. westfalica of initial F1 hybrids.The meiosis in the anthers of F1 plants is very irregular: in the profase multivalent-like configurations are formed and in the first anafase precociously dividing chromosomes and laggards are observed. However, male meiosis in T/. calaminaria ssp. westfalica shows similar irregularities suggesting a hybrid origin of the species as well. Apart from meiotic disturbances, we also found a number of mitotic irregularities in progenies of hybrid plants. These sometimes result in mitotic nondisjunction as shown by the occurrence of mixoploids and mosaics for a flower colour gene. The results are discussed in relation with the origin of the two subspecies of zinc violets.

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Section: Resultssupporting

confidence: 52%

“…Later Fothergill (1938) and Pettet (1964a) gave other examples. Hybridisation between V. tricolor L. and V. arvensis was studied by Clausen (1926) and Pettet (1964b).…”

Section: Introductionmentioning

confidence: 99%

Genecological investigations on zinc plants III. Cytology of hybrids between Viola calaminaria (Lej.) Ernst and Viola arvensis Murr.

Kakes

1980

Genetica

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“…Whereas, thanks to research of CLAUSEN (1924), FOTHERGILL (1938) and SCHMIDT (1962), cytogenetic data are available on the botanic species of the genus Viola, such data are practically lacking for the garden pansies Viola x wittrockiana Gams . The origin of the pansies can only partly be traced .…”

Section: Introductionmentioning

confidence: 99%

Reduction of ploidy level of tetraploid large-flowered garden pansies (Viola x wittrockiana Gams.) to diploid level after crossing with diploid V. tricolor L.

Kroon¹

1972

Euphytica

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“…Fernandes (1950), Fothergill (1944), Gershoy and Bold (1934), Jorgensen, Sorensen and Westergaard (1958), Love and Love (1956). Only in North Africa plants with the number 2n = 24 have been found (Quezel, 1957 (1921, 1926, 1927, 1931a), Fothergill (1938Fothergill ( , 1941Fothergill ( , 1944, Gershoy (1934 (1921, 1922, 1926, 1927, 1931a), Fothergill (1944), Kondo, Matsunami and Hagiwara (1956), Love and Love (1956).…”

Section: Introductionmentioning

confidence: 99%

A Cytotaxonomic Study of Viola in the Netherlands

Gadella¹

1963

Acta Botanica Neerlandica

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Studies in viola, 1: The cytology of a naturally-occurring population of hybrids betweenViola tricolor L. andViola lutea huds

Cited by 15 publications

References 18 publications

Genecological investigations on zinc plants III. Cytology of hybrids between Viola calaminaria (Lej.) Ernst and Viola arvensis Murr.

Genecological investigations on zinc plants III. Cytology of hybrids between Viola calaminaria (Lej.) Ernst and Viola arvensis Murr.

Reduction of ploidy level of tetraploid large-flowered garden pansies (Viola x wittrockiana Gams.) to diploid level after crossing with diploid V. tricolor L.

A Cytotaxonomic Study of Viola in the Netherlands

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