Summary
-
1.
The paper is a detailed account of the prophasic changes in the nuclei of the microspore mother cells inScœvola Lobelia Linn.
-
2.
The leptotene threads are beaded with clear diamond-shaped areas. It is therefore probable that the threads are double.
-
3.
There are eight diplotene pairs and these are of different lengths. The nature and number of the chiasmata in these pairs are followed.
-
4.
The late diplotene chromosomes show the presence of two coiled strands in specially favourable preparations.
-
5.
The haploid number of chromosomes is determined from several countings to be eight; this number also corresponds to the number of diplotene pairs.
-
6.
After the second division in the mother cells, the microspores are formed which show the typical tetrahedral arrangement.
-
7.
The pollen grains are binucleate at the time of liberation from the anther locules.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
Literature Cited
Billings, F. H. “Beiträge zur Kenntnis der Samenentwicklung,”Flora, 1901,88, 253–318.
Brough, P. “Studies in theGoodeniaceœ. I. The life history ofDampiera stricta R. Br.,”Proc. Linn. Soc. N. S. W., 1927,52, 471–98.
Cooper, D. C. “Nuclear Divisions in the Tapetal Cells of Certain Angiosperms,”Amer. Journ. Bot., 1933,20, 358–64.
Coulter. J. M. “Contribution to the life-history of Ranunculus,”Bot. Gaz., 1898,25, 73–88.
- and Chamberlain C. J.,The Morphology of Angiosperms, 1903.
Darlington, C. D.Recent Advances in Cytology, 1937.
Gates, R. R., and Rees. E. M. “A cytological study of Pollen Development in Lactuca,”Ann. Bot., 1921,35, 365–98.
Huskins, C. L., and Smith. S. G. “Meiotic Chromosome Structure inTrillium erectum L.,” —, 1935,49, 119–50.
Joshi, A. C., and Venkateswaralu, J. “Embryological Studies in theLythraceœ III,”Proc. Ind. Acad. Sci., 1936,3, 377–400.
Koshy, T. K. “Number and Behaviour of Chromosomes inAlœ litoralis,” Ann. Bot., N.S., 1937,1, 43–58.
Maheshwari, P. “Contribution to the Morphology of Some Indian Liliaceæ. I,”Proc. Ind. Acad. Sci., 1924,1, 197–204.
Naithani, S. P. “Chromosome Studies inHyacinthus orientalis L. II,”Ann. Bot., N.S., 1937,1, 257–75.
Raghavan, T. S. “Morphological and Cytological Studies in theCapparidaceœ. II,” —, 1938,2, 75–95.
Rosenberg, O. “ Ueber die Pollenbildung von Zostera,”Meddel.,Stockholms Högsk. Bot. Inst., 1901 (cited by Wylie, R. B.. 1904).
Schnarf, K.Embryologie der Angiospermen (Handbuch der Pftanzenanatomie, by K. Linsbauer),” 1929.
-Vergleichende Embryologie der Angiospermen,” 1931.
Schürhoff, P. N.Die Zytologie der Blütenpflanzen,” 1926.
Singh. B. “The life-History ofRanunculus sceleratus Linn.,”Proc. Ind. Acad. Sci., 1936,4, 75–91.
Wylie, R. B. “The Morphology ofElodea canadensis,”Bot. Gaz., 1904,37, 1–22.
Author information
Authors and Affiliations
Additional information
Communicated by Dr. M. A. Sampathkumaran,m.a.,Ph.D.
In conclusion it is my pleasant duty to express my gratitude to Dr. M. O. P. Iyengar, Director, University Botany Laboratory, Madras, for kindly suggesting this work. Further, I am greatly indebted to Prof. M. A. Sampathkumaran for kind encouragement and helpful criticism during the course of this investigation.
Rights and permissions
About this article
Cite this article
Kausik, S.B. A Cytological study ofScaevola Lobelia Linn. Proc. Indian Acad. Sci. 9, 39–48 (1939). https://doi.org/10.1007/BF03050419
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF03050419