M. S. Rawat , D. P. Uniyal , R. K. Vakshasya

Abstract

In forest tree species like Teak, to save time, work on selection of plus trees, establishment of grem plasm banks and creation of seed orchard has to be taken up simultaneously. Genotypic differences, for various parameters, between clones assembled in a first cycle seed orchard create lot of problems and as a consequence seed production is much less than expected. Experiences gained from the model seed orchard of Teak at New Forest, Dehra Dun-first ever seed orcbard in the country - have been presented in this paper to provide information on the performance of various clones to serve as guiding factors for the creation of second cycle seed orchards.

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R. K. Vakshasya , D. P. Uniyal , M. S. Rawat

Abstract

Characterlstic branchy hablt of cotyledons was observed in seedlings of Pinus wallichiana AB Jacks, a first ever record in tbe Himalayan pine and probably in conifers. Differences between these normal cotyledons wlth ultrastructure studies are highlighted. Also the abnormal seedlings, recovered during germination studies of the seeds obtained from open pollination, are reported under specific beads as 'lethats' and non-lethats'. The present paper reports tbe appearance of abnormal seedlings and discusses probable explanation for their appearance under various experiments. The need of c1assifying these abnormal seedlings is advocated so that uniform terminology can be adopted to ensure tbe morbid types recovend for understanding the reflection of genetic structure of the population.

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R. K. Vakshasya , D. P. Uniyal , M. S. Rawat

Abstract

No abstract

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R. K. Vakshasya , C. J. S. K. Emmanuel

Abstract

An abnormal seedling of Teak (Tectono grandis), in respect of chlorophyll deficiency causing variegation in leaves, has been reported.

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S. Kedharnath , M. L. Kapoor , R. K. Vakshasya

Abstract

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.

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M. L. Kapoor , R. K. Vakshasya , S. Kedharnath

Abstract

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.

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