T S Raghavan
Articles written in Proceedings – Section B
Volume 12 Issue 2 August 1940 pp 29-46
Volume 12 Issue 5 November 1940 pp 221-234
Volume 13 Issue 1 January 1941 pp 24-32
Volume 13 Issue 2 February 1941 pp 85-108
Volume 13 Issue 2 February 1941 pp 109-128
Volume 13 Issue 4 April 1941 pp 229-234
Volume 13 Issue 4 April 1941 pp 235-243
Volume 13 Issue 5 May 1941 pp 325-344
Volume 14 Issue 1 July 1941 pp 35-46
The development of microsporangium in
A comparative study of the embryo-sac and embryo formation in
The development and behaviour of the megaspore in the hybrid is described and compared with that of the parents.
Volume 14 Issue 4 October 1941 pp 412-426
The development of embryo-sac and embryo has been described in
The haploid numbers,
The development of the strophiole has been traced and it is considered to have little phylogenetic importance.
The suggestion previously made that 11 was the basic number of the family is confirmed by data gathered in this paper.
The evolution of the chromosome numbers in this family is discussed in the light of data known in connection with nucellar evolution. A correlation is established between the two and a few tentative schemes of nucellar and chromosomal evolution suggested.
Volume 14 Issue 5 November 1941 pp 472-488
The development of the microsporangium of
The diploid number of chromosomes was found to be 18, which was confirmed by the meiotic counts. Diploid chromosome numbers of two other species of
Meiosis is normal and the microspore is two-celled at the shedding time.
Development of the ovary and the ovules is described in some detail. Embryo-sac formation and embryo development are of the normal type.
The possible meaning of the tapetal nuclear fusion is discussed from the view-point of the nutritive function of the tapetal cells.
The importance of recounting morphological details in spite of their repetition, is discussed in the light of observations recorded in this paper. The position of
Volume 15 Issue 1 January 1942 pp 61-74
Two species of a local
The somatic chromosome complements of the parents were analysed and compared with that of the hybrid.
Meiosis in the parents and the hybrid is also described. Chromosomal pairing in the hybrid is discussed as throwing light upon the relationship between the parents.
Volume 15 Issue 2 February 1942 pp 83-105
The haploid chromosome number of
The origin and development of the microsporangium, the embryo-sac, the endosperm and the embryo is described in detail; both
In both the species of
No relationship could be established between the divison of the family on the basis of the type of endosperm development with (i) division of the family by taxonomists on morphological grounds and (ii) the chromosome numbers known in the family.
For a cytotaxonomical approach, cytological details like secondary association, etc., of which no information is now available, are suggested to be a necessary prerequisite.
The role of the integumentary tapetum is discussed in the light of its correlation to the nucellus and the endosperm.
Volume 17 Issue 4 April 1943 pp 118-132
Somatic chromosome numbers have been determined mostly for the first time for 24 species, spread over 7 genera.
Chromosome complements in
The basic numbers 6, 9, 11, 12, 13 and 21 are suggested for the genera
A biphyletic origin is suggested for the species of
Speciation in this family has been found to be due to polyploidy, aneuploidy and structural changes.
The 42 chromosomed members of the genus
The distinctive nature of the chromosomes of Costus, their morphology and number, would appear to justify the separation of this genus into a tribe or sub-order.
Volume 26 Issue 6 December 1947 pp 236-275
Cytogenetical studies in sesamum - Part I. Cytology of the parents,
Interspecific crosses between
Details of meiosis of
The irregular meiosis of the sterile hybrid and the occurrence of scattered bivalents and univalents in the metaphase plate, leading to the ultimate formation of abnormal sporads have been described fully.
The regular meiosis of the fertile amphidiploid is compared with the irregular meiosis of the sterile hybrid and the cause of this regularity is explained.
The nucleolus with behaviour of the special regard to its persistence and movements is discussed.
Interspecific hybridisation as a guide to ancestral homology and the artificial synthesis of a new species are discussed in the light of cytological data gathered in the present investigation.
The origin of the cultivated Til
The origin of the wild
Volume 38 Issue 2 August 1953 pp 94-98
Volume 43 Issue 2 February 1956 pp 100-109
In sugarcane breeding the appropriate species of
The cyto-genetical basis for the (seemingly capricious) breeding behaviour of sugarcane, has been briefly indicated. Parthenogenesis and chromosome elimination coupled with cytoplasmic inheritance, seems to indicate the greater importance which has to be bestowed upon the pistillate parent in sugarcane breeding. The constitution of some of the important economic seedlings, has been explained from this point of view.