E. M. Marsden-Jones
Articles written in Journal of Genetics
Volume 21 Issue 2 August 1929 pp 169-181
Volume 23 Issue 1 September 1930 pp 83-92
Volume 27 Issue 2 May 1933 pp 261-285
1. It is shown that
2. A considerable number of true-breeding phenotypes have been collected or have appeared in bred generations. Some of these can be included under published varietal names, but it has been necessary to make an arbitrary choice in fixing a standard for the names var.
3. It is shown that a limited number of parental “varieties” by natural crossing can produce heterogeneous populations which consist of very many different phenotypes, some homozygous, some heterozygous.
4. The introduction of an alien type (var.
5. The results of field studies so strongly confirmed what would otherwise have been tentative suggestions regarding the origin of hybrid phenotypes, that it seems desirable to urge that field studies should always be made in connection with breeding work whenever possible.
We desire to express our very sincere thanks to Mr G. Atkinson, artist to the Royal Botanic Gardens, Kew, for the excellent coloured figures he has made from our material.
The research on which this paper is based has been aided by a Royal Society Government Grant.
Volume 29 Issue 2 July 1934 pp 245-268
1. Forty-eight hybrid families involving
2. Segregation was found frequently for corolla characters. This is considered to have a genic basis.
3. One series of five families showed marked segregations in parental characters. In addition there occurred various plants morphologically peculiar.
4. In twenty-nine families (with a total of 4068 plants) no segregation into parental characters occurred although all these plants had chromosome complements from both
5. In addition to plants not separable from
6. In all non-segregating families, except those with two dosages of
Volume 31 Issue 3 October 1935 pp 363-378
1. Six “sex” types are recognised in
2. Variations are not due to differences in chromosome numbers.
3. Apomixis occurs in a low percentage of ovules, successfully in less than 1 per cent. under the most favourable experimental conditions tested.
4. The “male” condition is completely recessive to the hermaphrodite and segregates in a ratio probably representing 3:1.
5. Constant or almost constant female, and constant hermaphrodite plants occur in the wild and as segregates from crosses; male and neuter plants are always constant; many other plants fluctuate between the hermaphrodite and female condition.
6. A possible genetical scheme is suggested, comparable to that accepted in
Volume 34 Issue 3 June 1937 pp 487-495
Volume 36 Issue 3 September 1938 pp 431-445
Volume 48 Issue 2 August 1947 pp 206-218
Volume 50 Issue 3 February 1952 pp 522-534
An account is given of a wide range of plants of
Volume 51 Issue 1 July 1952 pp 26-31
This paper is a continuation of two previous papers on the genetics of
Volume 54 Issue 1 January 1956 pp 186-193
Comparative descriptions are given of British material of
Families have been raised from selfings and from crossings of our stock plants of these taxa, and from reciprocal crosses of
In the discussion it is shown that genetical sterility barriers are not important in keeping the taxa distinct and their absence or incompleteness explains the occurrence of ‘intermediates’ in certain wild populations and in some plants in cultivation.
The doubtful taxonomic value of the differences between
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