Five horticultural forms of Carica papaya growing in India have been studied. Karyotypes of them represent homogeneity. Slight structural difference in chromosomes of different varieties is noticed, which proves the role of structural alteration of chromosomes on the evolution of the forms. No heteromorphic pair, or unpaired chromosome or any chromatin body, suggesting chromosomal basis of sex difference in the species, could be recognized. © 1971, Japan Mendel Society, International Society of Cytology. All rights reserved.

P C DATTA

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University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

CYTOLOGIA

Andrographis paniculata an well known indigenous drug plant of the whole Indian subcontinent, attracted attention for the diversity of ecological conditions of its abodes. Discovery of genetically distinct types, if chemically distinct, would certainly help in the selection of best strains. The simplest and quickest way of detecting genetical difference is the cytological techniques and study of chromosome morphology. Of course these cytological methods could detect only such genotypes which had structural alterations of chromosomes, but not pure genic changes or point mutations. The chromosomal biotypes differed only in structure suggesting the occurrence of cytotypes within this species, brought about by translocation, deletion etc. These chromosomal changes probably made the cytotypes best suited to their environments, where they normally grew. As in reports, many such cytotyes of other taxa, differ in micro- and macromorphological characters and chemical contents, these cytotypes were also suitable for analyticl study of quantitative anatomy, morphology and of the active principle available in this species. © 1988, Japan Mendel Society, International Society of Cytology. All rights reserved.

Chromosomal biotypes of andrographis paniculata in india and bangladesh

The action of different prefixing agents including water and a dilute CaCl2 solution on plants with high chromosome number showed that all the solutions tried exhibited marked effect on the physical state of the plasma. Also the plasmatic constitution of the pretreated tissue differed from the appearance of one fixed directly in dye-acid mixture for a few seconds without any pre-treatment. For the clarification of the karyotypes, the best results have been obtained with paradichlorobenzene. It was used as a prefixing agent with a short schedule for temporary smears of difficult materials, particularly those with high chromosome number. The method comprised treatment of the root tips in a saturated aqueous solution of the chemical for 3 hours at 12-16°C., followed by 4-5 seconds heating just to boiling in orcein-hydrochloric acid mixture, then smearing in 1% aceto-orcein solution. © 1955 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted.

Journal	CYTOLOGIA
Publisher	-
ISSN	0011-4545
Open Access	Yes