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Venkatesh, C. S.
- Heterosis and Variation in Reproductive Parameters of Reciprocal F1 Hybrids between Eucalyptus tereticornis Sm. And E. Camaldulensis Dehn
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Indian Forester, Vol 119, No 9 (1993), Pagination: 714-721Abstract
F1 hybrids belonging to two reciprocal interspecific crosses between Eucalyptus tereticornis and E. camaldulensis which had proved conspicuously heterotic in growth rate and flowering precocity also proved heterotically superior in flowering density, seed production and seed weight. While in flowering precocity FRI-5 (E. camaldulensis x E. tereticornis) was heterotic over the mid-parent only, in height, diameter, flowering density, seed production and seed weight, both the hybrid classes were superior over the better E. tereticornis parental progenies. Hybrid seed was highiyviable and its germination energy was higher than the mid-parental value. Since all the investigated quantitative traits varied considerably in the F1 generation itself and since no correlations were observed among them it must be inferred that independent polygenic systems control their inheritance. Strong maternal effects were also evident for various characters in the hybrids. While high and sustained heterotic growth superiority could be directly utilized for speedier and higher wood or phytomass production in mini-rotation pulp and energy forest plantations on suitable sites, heterosis in flowering precocity and various seed characters can facilitate accelerated breeding of advanced-generations and recurrent selection.
- Biotechnology in Tree and Bamboo Improvement
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Indian Forester, Vol 118, No 4 (1992), Pagination: 249-255Abstract
No doubt the new techiques of biotechnology such as tissue culture, parasexual hybridization through protoplast fusion, haploid production and genetic engineering hold promising potential in future genetic tree improvement work. However, a number of hurdles still remain to be crossed before they can be adopted as standard techniques in agricultuntl crop and tree improvement work. Further, in the foreseeable future these new techniques will most likely be used as adjuncts to rather than a replacement of conventional tree breeding methodology. For, unlike crop species, forest trees have not been domesticated before and therefore retain in themselves a good deal of natural genetic Vlriability. Therefore, while persisting with traditional tree improvement methods, progressive tree breeders also need to keep in touch with current and future developments in the exciting new field of biotechnology and should be on the lookout for their possible applications in their work.- Notes on Poplars
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Indian Forester, Vol 109, No 9 (1983), Pagination: 694-695Abstract
no abstract- A Strategy for Accelerated Seleccton and Release of Advanced-generation Eucalypt Species Hybrids
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Indian Forester, Vol 108, No 4 (1982), Pagination: 247-252Abstract
This paper outlines the strategy for concurrent multiplication testing, selective breading and utilization or the second and feather advanced generation hybrids of two promising interspecific crosses between Eucalyptus tereticonis Sm. and E. camaldulensis Dehnh. two of the most widely grown species of this genus in the world today. The advantage of using second generation hybrids in preference to those of the first, are explained. In order to ensure concurrent practical benefits, clonal plantations are envisaged after every step of selection.- A Note on Air Layering and Budding in Semul
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Indian Forester, Vol 104, No 2 (1978), Pagination: 142-144Abstract
Air layering and budding in Semul (Bombax ceiba L.) are briefly described. The advantage of budding over the standard cleft grafting method is indicated.- On The Occurrence of Unisexual Male Flowers in the Red Silk Cotton Tree (Bombax ceiba)
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Indian Forester, Vol 104, No 5 (1978), Pagination: 367-368Abstract
no abstract- Twin Seedlings in BombaX ceiba L. (Bombacaceae)
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Indian Forester, Vol 104, No 6 (1978), Pagination: 411-413Abstract
The occurrence of polyembryonic twin seedlings is reported for the first time in this economically useful tropical broadleaved tree.- The Fragrant Heart
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Indian Forester, Vol 103, No 6 (1977), Pagination: 435-435Abstract
no abstract- A Note on Twin Seedlings in Pterospermum acerifolium Willd.
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Indian Forester, Vol 103, No 10 (1977), Pagination: 679-679Abstract
no abstract- Twin Seedlings in Shisham (Dalbergia sissoo Roxb.)
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Indian Forester, Vol 103, No 11 (1977), Pagination: 770-770Abstract
no abstract- Rapid Growth Rate and Higher Yield Potential of Heterotic Eucalyptus Species Hybrids FRI-4 and FRI-5
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Indian Forester, Vol 103, No 12 (1977), Pagination: 795-802Abstract
In pilot field trials established in 1972-73 at Dehra Dun heterotic F4 hybrids of the Eucalyptus species crosses FRI-4 (E. tereticornis × E. camaldulensis) and FRI-5 E. camaldulensis × E. tereticornis showed very rapid height and diameter growth increment and by age 4, dramatically excelled the parental controls by 271% and Mysore Gum (Mysore Hybrid) by 109% in mean standing volume. Since mass production de novo of F1 hybrid seed is difficult and will at any rate involve much time, therefore tested and pedigreed F2 seed has been released instead as breeder material for multilocation performance and yield trials of these promiting and potentially very high wood yielding hybrid tree varieties. Independently, progeny test results indicate that selective breeding within existing Mysore Gum. populations could give first generation genetic gains of as much as 46% in volume.- Expected Genetic Gains from Forest Tree Breeding
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Indian Forester, Vol 102, No 6 (1976), Pagination: 402-407Abstract
The kind and magnitude of practical gains realisable through the application of genetics in forestry, are outlined. It is concluded that by adopting different Relection procedures and breeding methods, substantial economic gains can accrue to the forest grower as well as the forest based industry. The plea is therefore made that the state forest departments and the industries in this country adopt these without any further delay, and reap the economic benefits that can be realised thereby.- Observations on the Flowering and Fruiting Behaviour of Semul Grafts
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