Cytology and origin of a tetraploid Trichosanthes palmata Roxb.
- 36 Downloads
Cytology of male plants of a tetraploid Trichosanthes palmata Roxb. has been studied. The plants showed 44 chromosomes in root tip cells. Chromosomal associations during diakinesis and early meiotic metaphase were studied. Chromosome number and morphology, high multivalent frequency, meiotic irregularities, general morphological characters and larger size of the stomata and epidermal cells compared to the diploid relative suggest that this collection is of possible autopolyploid origin.
Although the plants are dioecious, cytologically distinet sex chromosomes were not detected neither in the diploids reported earlier, nor in the tetraploids described in the present study.
KeywordsChromosome Number Epidermal Cell Morphological Character Male Plant Chromosomal Association
Unable to display preview. Download preview PDF.
- Banerji, I. & M. C. Das (1937). The development of microspores in Trichosanthes dioica Roxb. Ind. J. agric. Sci. 7: 497–510.Google Scholar
- Darlington, C. D. (1965). Cytology. Churchill, London.Google Scholar
- Darlington, C. D. & A. P. Wylie (1955). Chromosome Atlas of Flowering 0 Plants. Allen & Unwin, London.Google Scholar
- Rangaswami Ayyangar, K. (1949). Sex chromosomes of Trichosanthes palmata Roxb. Proc. 36th Ind. Sci. Congr. 3: 137.Google Scholar
- Rangaswami Ayyangar, K. (1967). Taxonomy of Cucurbitaceae. Bull. Natn. Inst. Sci. India 34: 380–396.Google Scholar
- Scott, F. M. (1944). Cytology and microchemistry of nuclei in developing seeds of Echinocystis macrocarpa, Bot. Gaz. 105: 329–338.Google Scholar
- Stebbins, G. L.Jr. (1950). Variation and Evolution in Plants. Columbia University Press, New York.Google Scholar
- Swanson, C. P. (1968). Cytology and Cytogenetics. MacMillan, London.Google Scholar
- Varghese, B. M. (1971). Cytology of Trichosanthes palmata Roxb. Cytologia 36: 205–209.Google Scholar