S. K. Verma , V. K. Sharma , S. K. Bagchi , H. S. Ginwal

Abstract

This paper summarizes the results of differential response in sprouting behaviour of sixty clones after pruning in Eucalyptus tereticornis in Vegetative Multiplication Garden (VMG). The maximum number of shoots 15.2 was observed in clone 5(A) followed by 14.6 and 14.5 in clone 7210320 and 82102051 respectively. Highly significant (P<0.05) correlations werc observed between number of shoots and collar diameter. It was observed that with the increase in diameter of the coppiced stump, the number of shoots produced per stump increased significantly. It was concluded that by pruning of Eucalyptus tereticornis ramets, maximum number of shoots cuttings may be made available from a hedge-garden to produce ischolar_mained cuttings on a mass scale for clonal forestry programme by judicious selection of clones having high regenerating capacity of shoot production following hedging.

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V. K. Sharma , Ila Joshi , Prabha Bisht , S. K. Bagchi

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No abstract

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S. K. Verma , V. K. Sharma , S. K. Bagchi

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The present paper reports the variations observed in specific gravity of wood in segregating populations of F₂ and F₃ hybrids of E. citriodora and E. torelliana. Perhaps this is the first report of its kind so far as the F₂ and F₃ hybrids of Eucalyptus are concerned. These studies were carried out on lO-year-old plants growing in a field trial laid out in 1987 at New Forest Campus, Dehradun. (Alt. 640m. Lat. 30° 30° 40° N.R.F. 216 cm.). A comparison in specific gravity of wood has been made with parent species involved in hybridization. A subtle range in variation in specific gravity of wood was observed due to segregation. The range in specific gravity of wood observed was 0.8144 - 0.8931 in E. citriodora, 0.6279 - 0.6590 in E. torelliana and 0.5170 - 0.6677 for F₂ and F₄ recombinants. Since a wide spectrum of variation has been observed in individual tree specific gravity of wood belonging to F₂ and F₃ generation hybrids this has offered ample scope for selection of desired recombinants for different end uses.

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S. K. Bagchi

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An analysis of correlation coefficients with the same set of data, (1) with age and, (2) without age (by partialing out the age element) revealed negligible -differences on the magnitude of correlation coefficients, indicating that age need not be considered for analysis purposes. However, it has been suggested that though it is not necessary to consider the age element and the raw data can be used as such for multivariate analysis, the standardised data also could be used for the purpose. This procedure is beneficial while utilising the data for classification of plants from natural forests or of plantation origin where age is not known.

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S. K. Verma , S. K. Bagchi

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In an experiment with E. tereticornis (Mysore-gum) three different substrates were used to find a suitable media for developing ischolar_mained cuttings. No ischolar_main promoting hormones were applied. The three substrates were vermiculite, riverine sand and soil mixture (sand, soil and farm yard manure in a ratio of 1:2:1). It was observed that in vermiculite ischolar_mains produced are lengthy and in sand more number of ischolar_mains are produced in comparison to the other media; suggesting that, after ischolar_main initiation from cuttings in sand they may be planted in soil mixture for further development.

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S. K. Verma , S. K. Bagchi , M. C. Mittal

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Easy ischolar_mainability being an important criterion for selection of superior trees for mass-multiplication, ischolar_maining of juvenile cuttings from nine month old half-sib progenies of selected trees were taken up, which revealed significant differences in ischolar_maining responses along with other traits. It was observed that progenies of C1, C2 and C3 trees performed best. Correlation among all the characters were found to be sufficiently high and the parent-progeny correlation revealed significant positive relationships between DBH x Number of leaves and Height x Number of leaves. Further investigations on mature-juvenile relationships based on number of leaves in seedlings may be necessary.

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S. K. Bagchi , M. C. Mittal

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A study was conducted to find out the magnitude of regenerated shoot production (coppicing ability) after pruning in Eucalyptus (Mysore-gum). Shoot prunings were grouped at four height classes. Number of shoots regenerated after pruning were counted on individual plant basis. An analysis of variance showed that the four groups of pruning levels produced significantly different number of shoots. As the pruning height-level increased gradually, the mean number of shoot production decreased along with a decrease in variation. Increase in mean and variation at the lower level was possibly due due to the increased ischolar_main-system influence or the juvenility at that Jevel. The highest mean for shoot production was obtained at < 10 cm beight of pruning. It was concluded. That pruning of Eucalyptus (Mysore-gum) plants be made at less than 10 cm level to produce maximum number of shoots for the establishment of a hedge-garden from which large number of cuttings may be made available to produce ischolar_mained-cuttings in a mass-scale for clonal forestry purposes.

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S. K. Bagchi

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In a study of 80 batches of teak trees, selection differential and predicted genetic gain values were estimated. This involved individual character variation analysis, estimation of heritability and computation of predicted gain values. Predicted gain values were estimated for individual batches along with an overall estimate. Some individual batch values (predicted gain) were found to be higher and the upper 5% values of overall batches were substantially high tban the overall meanestimate of the predicted gain values. This along with 20% selection intensity, significantly different mean-square values and high heritability assure shifting of the mean towards the direction of selection. The hatches with higher predicted gain values were indicated for use in the mass clonal multiplication programme and also for further selective breeding and improvement.

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S. K. Bagchi , J. Singh

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Free-proline content in plants increases due to various reasons of which abiotic stress is one. Under non-stress condition certain level of tree-proline is maintained. On the basis of which stressed and unstressed plants are compared. The free-proline level of unstreased plants has been found to vary again. This variation helps comparison among unstressed plant groups. Present lnvestigation is a comparative study of different provenances for their free-proline content in leaves of Acacia nilotica.

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S. K. Bagchi

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Reports on Acacia nilotica show that bigger seeds produce vigorous seedlings and the vigour is maintained throughout its growth period. In search of bigger seeds and of contribution of individual characteristics towards divergence, genetic divergence studies were conducted with the help of Mahalanobis's generalised D²-stalistic among 42 provenances of Acacia nilotica. Each provenance was represented by 40 random samples of seeds, from each of which seed length, seed width and seed thickness were measured in mm. The estimated V-statistic was found to be significant (1773.753) at 0.001% level of probability with 12' degrees of freedom when tested as chi-square. Cluster analysis resulted in two groups, viz, A and B, of which A was the bigger group having 34 provenances and B the smaller with 8 provenances. The divergence (inter-cluster distance) between the two groups (2 532) was found to be quite high. The inter-cluster distance was higher in A than B. The characteristic Y3 contributed towards the maximum divergence and is more than 52% whereas Y2 (33.33%) and Y1 (14.54%) were serially next. The group B contain the provenances belonging to Rajasthan only, whereas the group A included samples from all other States. It may therefore be said that the clustering pattern is not based on geographic nearness but on genetic nearness and the clustering pattern is independent of geographical distribution. It may be concluded from the study that group A is best having higher group mean values for all the three characteristics. The higher inter-cluster distance in group A indicates higher variability within the group and it is quite likely that extreme individuals from group A may help in selection. Hybridisation between widely divergent groups may also help producing greater genetic diversity which may be utilised for further selection.

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S. K. Bagchi , H. C. S. Veerendra

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About two year old even-aged Santalum album plants were used to observe the mean and variability of growth performances after pruning. Under each of the two treatment conditions of 'with host' and 'without host'. the growth in general was sub-divided into three components, as, (1) initial growth, (2) regenerative growth and (3) expansive growth; to observe their individual performances and relationship among different characters. It was observed that the 'without host" treatment expressed lower mean and variability whereas the 'with host' condition showed higher mean and variability. The elementary characters (ICD, NSS) had lower variabilities and the composite characters had higher variability. The initial growth phase is always inversely) associated (not correlated) with all other growth phases and interestingly there is no correlation between the initial growth phase and the regenerating growth phase. Strong negative correlation between ICD and FSBL, SSBL, ISLN and SSLN suggests that, higher ICD is detrimental to the expansive growth. NSS is largely uncorrelated with other characters. It may be said that probably the elementary characters are indiVidually controlled genetically and the strong positive correlations among the composite characters indicate tbat they are likely to be similarly genetically governed.

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S. K. Bagchi , N. D. Dobriyal

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In a study of the Acacia nilotiea seed paramaters, provenance variation significant at 0.1% level of probability was observed. The estimates of provenance variation, residual variation and percentage of total variation explained by provenance revealed that the provenance were not able to explain tbe total variability more than 19%. This probably due to the musking effect of more number of samples from a particular zone on the others. The simple correlations between different pairs of characters were determined where length and width only were found to be correlated.

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S. K. Bagchi , A. K. Chaubey , H. D. Kulkarni

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Half-sib seedlings belonging to eight Santalum album trees located at different places were quantitatively measured for nursery characters to assess variability and superiority in seedling. Results revealed inter-tree variability was significant. It has also been assessed that the seedlings belonging to the tree numbers KL₃ K₃₃, K₂₆, and AP₄, are superior in performances and KL₃ be the best. The analysis of correlation coefficients among different characters indicate that the collar diameter is significantly negatively correlated with the shoot length. Shoot length and ischolar_main lengths are significantly and positively correlated.

Keywords

Seedlings

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S. K. Bagchi , H. D. Kulkarni

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H. C. S. Veerendra , S. K. Bagchi

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Study of six anatomical characters from the transverse sections of the apical stem portions of eight trees led to the observations, that, 1) considerable significant differences among character mean values and variabilities exists indicating genotypic differences; 2) a scoring method developed, in ascertaining the higher oil-content genotype.

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