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C. Narayanan , A. Nicodemus

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A. Nicodemus , J. Prasanth Jacob , B. Nagarajan

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A. Nicodemus , B. Nagarajan , C. Narayanan , M. Varghese , K. Subramanian

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RAPD markers were used to study genetic variation in ten Teak (Tectona grandis L.f.) populations from Western Ghats and Central regions of India. Ten oligonucleotide primers resolved 90 amplification products of which 66 (73%) were polymorphic. The total genetic diversity detected within the species (H_sp) was 0.3 Average gene diversity (H₀) within different populations ranged from 0.185 to 0.261 (mean = 0.233). The Western Ghats populations had more diversity (H₀ =0.227 - 0.261) compared to those from Central India (H₀ =0.185-0.219). Partitioning of gel;etie diversity within and between populations showed that 78% of variation existing within populations and the rest between populations. A negative relationship was observed between latitude and within-population diversity. Nei's genetic distance between populations ranged from 0.053 to 0.264. Genetic distance. Tended to be low between populations from the same geographic region. The UPGMA dendrogram grouped the Western Ghats and Central Indian populations into two distinct clusters. Low intensity selection within populations is likely to capture a major portion of genetic diversity existing in Teak. The Western Ghats and Central Indian regions can be proposed as separate genecological zones for Teak. Future conservation strategies should aim at preserving both within and across population variation in Teak.

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Mohan Varghese , A. Nicodemus , K. Subramanian

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Acacia auriculiformis is one of the Australian Acacia species introduced in India for afforesting degraded lands, meeting fuelwood needs and as avenue trees. This species has been raised in the Western Ghats areas of Maharashtra and found to be very successful. Efforts were made to introduce A. mangium and A. crassicarpa by procuring seeds from Australia and Thailand. Growth performance and wood characteristics were studied in A. mangium, A. auriculiformis and A. crassicarpa planted in Thane District of Maharashtra. A. mangium had better growth than A. auriculiformis and A. crassicarpa. A. auriculiformis had higher wood density and phyllode index than the other species and A. Crassicarpa had long fibres and vessel elements. Since A. Mangium is being increasingly planted in tropical countries, multi-locational trials need to be raised in high rainfall areas in India to select the best performing seedlots.

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A. Nicodemus ¹, A. Pauldasan ¹, P. Vipin ¹, J. Soosairaj ¹, A. Durai ¹, B. Gurudev Singh ¹

Affiliations
1 Institute of Forest Genetics and Tree Breeding Coimbatore, Tamil Nadu, IN

Abstract

Twenty provenances of six species of Casuarina (C. cristata, C. cunninghamiana, C. equisetifolia, C, glauca, C. junghuhniana, and C. obesa) were field tested for growth, stem straightness, bark, wood and fibre characters in Karunya, Tamil Nadu, India. Results obtained at 12 years ageshowedthat C. junghuhniana was the most adaptable and fastest growing species with 54% more volume production than the next ranking and widely cultivated species, C. equisetifolia. The SW Soe provenance of C. junghuhniana was the best provenance which recorded around 36% more volume than the species average and the best provenance of C. equisetifolia. The stem straightness was the best in C. cunninghamiana making it suitable for pole production. Bark thickness, wood density, moisture content and fibre traits varied significantly among species and provenances providing opportunity to select for different end uses like paper and fuelwood production. Since no adverse correlation was found between growth and wood traits, selections can be made independently for different traits. Testing of more provenances of C. cunninghamiana and C. cristata from northern latitudes and hybridization between species to combine desirable traits are proposed for effective utilization of genetic resources to increase plantation productivity.

Keywords

Casuarina, Provenance, Variation, South India.

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