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Kedharnath, S.
- Incidence of Phyllotaxy Variants in Teak (Tectona grandis L.f)
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Indian Forester, Vol 126, No 3 (2000), Pagination: 314-316Abstract
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- A Note on Field Grafting in Chir Pine
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Indian Forester, Vol 105, No 4 (1979), Pagination: 301-304Abstract
Syotematic field. grafting was carried out every month in Chir Pine (Pinus roxburghii Sarg) at New Forest, Dehra Dun from September, 1975 to june, 1976. One hundred per cent success in 'graft take' was obtained both in autoplastic and homeoplastic grafls made during the months of September, November and january. The grafts made daring the months of April, May and june failed completely. The grafts made during the months of October, Decetmber, February and March showed 60, 70, 65 and 55 percent suecess in homeoplaotic grafts and 55, 60, 60 and 50 per cent in autoplastic grafts. The knowledge gained from this trial on the best time of the year for grafting with this species it is expected that the work on establishment of seed orchard will get speeded up.- Field Grafting Studies in Pinus patula
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Indian Forester, Vol 103, No 6 (1977), Pagination: 397-402Abstract
Pinus patula is a fast growing exotic species from eastern Mexico which has done well in sub-tropical regions of India. It is a valuable long fibred raw material for paper pulp. The seeds of this species are in great demand by many countries for afforestation purposes. Thus, for ensuring sufficient production of genetically improved seeds of this species within the country, it was considered essential to establish clonal seed orchards. A knowledge of the optimal time for grafting is a very important prerequisite for speedy establishment of clonal seed orchards. To obtain information on the optimum time for grating, a systematic trial on field grafting was carried out from the month of September, 1975 to June, 1976 at New Forest, Dehra Dun. One hundred percent success in graft establishment was achieved during the months of November 1975 to March 1976. The grafting carried out in the months of September, October and April gave success in establishment that varied from 50 to 80 percent. The grafting carried out during May and June failed to establish. The climatic conditions obtaining during November to March with 11.4 to 16.8°C mean temperature appeared to be very conducive for establishment of the grafts. During the months of May and June when the mean temperature was 24.8 and 26.3°C the grafts failed to establish. Presumably, such high temperatures are not conducive for graft establishment.- Field Grafting Trials with Caribbean Pine
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Indian Forester, Vol 102, No 5 (1976), Pagination: 279-282Abstract
The caribbean pine which is an exotic to India has shown great promise. The seeds of this species are in great demand by many countries for taking up large-scale plantation work with the result that sufficient seeds are not easily obtiainable. Therefore, with the objective of becoming self sufficient in seeds of this species for planting programme, plans for establishing seed orchards have become becessary. For successful establishment of clonal seed orchards good grafting technique and knowledge of the optimum time for grafting are essential. Earlier grafting work done during March and April, 1975, with the scion material obtained from. Queensland, Australia, turned out to be a complete failure. Systematic grafting trials were, therefore, taken up at Dehra Dun in the months of September, October and November, 1975. Autoplastic and homeoplastic cleft grafts were made on side branches of 5 year old trees in the field in var. bahamensis. In Autoplastic grafts 60, 80 and 85 percent and in Homeoplastic grafts 15, 64 and 65 percent success was achieved respectively, for the months of September, October and November.- Studies on Variation in Fibre Morphology in Wavy-grained and Straight Grained Trees of Red Sanders
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Indian Forester, Vol 102, No 7 (1976), Pagination: 441-446Abstract
Wood samples extracted at breast height from 7 wavy-grained and 3 normal grained trees in red sanders were examined for possible variation in fibre morphology from pith to periphery. The data obtained was analysed by an analysis of variance using the mean values and grouping the trees into two groups of wavy and non-wavy, into three groups of highly wavy, medium wavy and non-wavy and finally without any grouping. The mean value of lumen diameter appeared to be larger in the wavy grained trees as compared to that from normal grained trees and difference between the mean values was found to be very highly significant. This is likely to be a useful character for screening the saplings if it is confirmed after an examination of a larger number of trees.- Change in Leaf Morphology in the Experimentally Synthesised Autotetraploids of Sandalwood
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Indian Forester, Vol 102, No 8 (1976), Pagination: 495-497Abstract
EsperimentalJy synthesised autotetraploids in Sandalwood appeared very distinct from their corresponding diploids because of a marked change brought about in the morphology of the leaves and the angle in which they are held on the branches. To quantify these differences measurements were recorded on length width and thickness of leaf, length, thickness and angle of petiole. frequency and size of stomata. Length of leaf and petiole and frequency of stomata. per unit area showed a decrease in the tetraploids whereas for width and thickness of leaf, thickness of petiole and length and width of stomata the tetraploids showed an increase over the measurements for the diploids.- Improvement of Teak by Selection and Breeding
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Indian Forester, Vol 88, No 4 (1962), Pagination: 277-284Abstract
A long term programme for the improvement of teak by selection and breeding has been taken up by the Forest Genetics Section of the Forest Research Institute, Dehra Dun. The objects of the teak breeding programme are to produce superior varieties for growth on dry, semi-moist and moist teak forest types as defined by Seth and Khan (1958). The programme is described in stages, those of selection, propagation, testing and finally production of seed and plants of the improved varieties. As an interim pleasure Seed Production Areas are being formed in the best stands of teak so that inherently better seed becomes quickly available. The selection of Plus trees, their propagation by bud-grafting and the formation of teak Seed Orchards are described in detail and the work required to ensure regular seed production in seed orchards is outlined. Finally it is concluded that conditions are very favourable for the application of selection and breeding for the improvement of teak in India.- Phyllotaxy Variants in Teak
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Indian Forester, Vol 89, No 2 (1963), Pagination: 125-125Abstract
No abstract- Preliminary Observations on Air Layering in Pinus Roxburghii and P. Caribaea
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Indian Forester, Vol 89, No 3 (1963), Pagination: 218-221Abstract
Air layering was successfully done in Pinus roxburghii Sargent., and P. caribaea/I> Morelet. Very good ischolar_main development was obtained in air layers tied on two-year old branches. One hundred per cent success was obtained in the air layers tried in April and May in the case of Pinus roxburghii and in June in the case of P. caribaea. Air layers on one-year-old branches failed to strike ischolar_main in both the species.- A Suspected Mutant in Acacia mearnsii
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Indian Forester, Vol 90, No 6 (1964), Pagination: 401-402Abstract
No abstract- Chromosome Preparations from Needle Bases of Chir Pine (Piyus roxburghii Sarg.)
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Indian Forester, Vol 91, No 7 (1965), Pagination: 477-478Abstract
no abstract- A Valuable Exotic Bamboo (Phyllostachys bambusoides) in Himachal Pradesh
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Indian Forester, Vol 92, No 6 (1966), Pagination: 428-431Abstract
no abstract- Field Grafting and Budding in Teak (Tectona grandis L.f.)
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Indian Forester, Vol 94, No 3 (1968), Pagination: 259-262Abstract
In the genetic improvement of forest trees vegetative propagation methods particularly grafting, assume great importance in that it enables the tree breeder to assemble the select clones in the seed orchard. In teak, grafting and budding trials were carried out in the field to find out the time when the 'take' would be the highest and also to assess the relative merits of the two methods. During the months of April and May in Dehra Dun, the 'take' in budding and grafting was observed to be very high. Both these methods are recommended for use in the establishment of seed orchards in teak.- Karyotype of Four Species of Pines Naturally Occurring in India
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Indian Forester, Vol 96, No 9 (1970), Pagination: 657-667Abstract
Karyotypes have been reported for the lour Indian species of Pinus, viz., P. roxburghii, P. insularis, P. wallichiana and P. gerardiana, P. roxburghii has two pairs of secondarily constricted chromosomes and the shortest pair (12th) has heterobrachial arms. P. insularis has two pairs of secondarily constricted chromosomes but two pairs of chromosome. (11th and 12th) have heterobrachial arms. P. wallichiana has only one pair (12th) with heterobrachial arms and no chromosome has secondary constriction. P. gerardiana has two pairs of chromosomes (11th and 12th) with heterobrachial arms like in P. insularis but none of the chromosome is secondarily constricted. On the basis of relative chromosomal length, the discriminant analysis showed that P. insularis is karyotypically distinct from the other three species, viz., P. roxburghii, P. wallichiana and P. gerardiana which form one single cluster.- Estimation of Risk of Reversal of Arms and Order of Chromosomes in Karyotype Analysis of Pinus roxburghii Sarg.
Abstract Views :167 |
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