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E. E. Cheesman
Articles written in Journal of Genetics
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Volume 26 Issue 3 December 1932 pp 291-312
Genetic and cytological studies of
Musa - I. Certain hybrids of the gros michel bananaArtificial pollination of the sterile and parthenocarpic Gros Michel banana (somatic chromosome number 33) by a fertile
Musa , identified as a variety ofM. malaccensis Ridl. (somatic chromosome number 22), results in formation of occasional seeds, the average seed production being less than one per hundred flowers.Of ten plants raised from such seeds and examined cytologically, eight have 44 somatic chromosomes and two about 75. The former resemble their female parent, and have parthenocarpic fruits but an increased pollen fertility; the latter are thick-leaved, dwarf, and apparently sterile.
Of five plants, forming an
F 2 generation from one of the 44-chromosomeF 1 individuals, three have 44 somatic chromosomes, and two have 46.The
F 1 crosses back to its female parent only with extreme difficulty, but crosses readily with its male parent, giving vigorous progeny with 33 somatic chromosomes.The course of events suggests that the basic haploid chromosome number in this series is eleven. The meiotic phenomena are not inconsistent with that hypothesis, but they further suggest that the eleven is a secondary haploid number, possibly derived from an original eight.
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Volume 26 Issue 3 December 1932 pp 313-316
Genetic and cytological studies of
Musa - II. Hybrids of the Mysore bananaThe Mysore banana seeds more readily than Gros Michel when pollinated by
M. malaccensis , but its behaviour is otherwise similar.Of nine hybrids raised and studied, six have 44 somatic chromosomes and resemble their female parent in vegetative habit, two are thick-leaved dwarfs comparable both in habit and in chromosome number with similar types raised from Gros Michel, and one with 33 somatic chromosomes is intermediate in vegetative characters between its parents.
Pollinated by the tetraploid Gros Michel seedling I.C. 1, Mysore gave two hybrids, of which one has approximately 55 chromosomes in its somatic cells, and the other approximately 90. Both are thick-leaved, and the latter is also dwarf and almost certainly sterile.
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Volume 30 Issue 1 January 1935 pp 32-52
Genetical and cytological studies of
Musa - III. Chromosome numbers in the musaceae -
Volume 43 Issue 3 April 1942 pp 337-357
Genetical and cytological studies of
Musa - IV. Certain triploid clones -
Volume 48 Issue 3 January 1948 pp 285-293
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Volume 48 Issue 3 January 1948 pp 293-296
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Journal of Genetics
Volume 101, 2022
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