tag:blogger.com,1999:blog-74060562461325385732011-07-30T23:36:51.400-07:00Title of PhD Thesis: Intraspecific variation of Andrographis paniculata Nees Supervisor: Dr. S. Seeni Institution: Work carried out at Tropical Botanic Garden and Research Institute (TBGRI), India and degree awarded by University of Kerala.Sabuhttp://www.blogger.com/profile/08478597650715236084noreply@blogger.comBlogger71100tag:blogger.com,1999:blog-7406056246132538573.post-21188889165138465722006-11-12T01:13:00.002-08:002010-10-17T03:33:59.426-07:00

If cloning is the norm among animals and there is no chance for mating, then the earth would be full of the organisms as ‘Dollies’. Similarly in a situation where all plants multiply by simple detachment of parts and growth of each part into a faithful photocopy of the mother plant, then there would be very little room for variation and evolution without which living organisms cannot adapt to

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The word ‘species’ literally means outward or visible form. It comprises groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups (Mayr, 1940). The Linnaean concept of species as relatively constant unit with most of the variations occurring among them is different from Darwin’s theory of evolution by gradual change, which states

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3.1 Materials 3.1.1 Plant materials Representative samples of A. paniculata collected from various regions in India and other countries of Asia were used for the study. Seeds from foreign sources were either collected (Malaysia) or received as gift. Four-month-old plants raised through seed propagation and reared under identical conditions served as the source of young leaf tissues used in

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4.1 Germplasm collection Fifty six populations of A. paniculata were sampled (Fig. 4.1; Appendix I) from different geographical regions of tropical Asia. Out of 52 plant populations from India, 28 were from Kerala, 18 from Tamil Nadu, 2 each from Karnataka and Andhra Pradesh and 1 each from Assam and Maharashtra. There were 4 foreign populations, each from Indonesia, Malaysia, Sri Lanka and

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The prerequisite of any program aimed at studying genetic variations is to understand distribution pattern of the target species (Bothmer and Seberg, 1995). Because the sampling procedures should recover the greatest amount of the genetic variation of the species, irrespective of the relative frequency or rarity of any genes or linked genetic combinations (Bogyo et al., 1980). In the present

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For the biodiversity rich developing countries in the tropics, chemical and genetic prospecting of their plant genetic resources is a priority area not only to fish out genotypes/molecules of potential economic importance but also to add value to them. The present study essentially directed towards this objective, involves analysis of intraspecific variations in Andrographis paniculata Nees (

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Adams, W.T., D.B. Neale, A.H. Doerksen and D.B. Smith. 1991. Inheritance and linkage of isozyme variants from seed and vegetative bud tissues in coastal Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco). Silvae Genetica 39: 153-167.Ahmad, M and M. Asmawi. 1992. A study of the hypoglycaemic property of Andrographis paniculata Nees. 7th Asian Symposium on Med Plants, Spices and

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