Informatics Publishing Limited

K. R. Ramesh , D. K. Khurana

Abstract

Populus alba cuttings were collected from Raksham (Kinnaur) of Himachal Pradesh during 1999-2000 to standardize the ischolar_maining hormones for ischolar_maining of P. alba cuttings. These were raised in the nursery of Dr. Y.S. Parmar University of Horticulture and Forestry Solan. It was concluded from the investigation that P. alba can be mass multiplied through shoot cuttings with the aid of 125 ppm IBA treatment. This concentration resulted in significant higher ischolar_maining per cent, ischolar_main fresh weight, ischolar_main dry weight, shoot fresh weight, shoot dry weight, internodal length and height. The simple correlation was calculated for all the auxin treatments/concentrations with respect to height, internodal length, ischolar_main fresh weight, ischolar_main dry weight, shoot fresh weight, shoot dry weight and ischolar_maining percentage. The observations for all those traits clearly indicated highly significant correlation's between all the traits at one per cent level of significance. Further all these traits i.e. Growth as well as biomass traits found to be positively correlated with each other. These correlation's may be exploited in a Tree improvement programme.

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K. R. Ramesh , D. K. Khurana

Abstract

Natural variation studies were conducted in Populus alba Linn. to determine the range of variation in Himachal Pradesh and Jammu & Kashmir States. The characters studied were height, diameter, and general shape at the base of the leaf blade, clear bole, taper and number of stomata. Analysis of co-variance showed significant differences for different provenances of P. alba Linn. for height, d.b.h., taper, clear bole, leaf area and number of stomata. Strong correlation was obtained between height and d.b.h. The species showed more genetic variation among the natural stands and needs genetic improvement.

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Arun Kumar Handa , Sanjeev Thakur , D. K. Khurana

Abstract

Isozyme analysis has been used to identify the hybrid plants of Populus ciliata x maximowiczii. Out of five enzymes tested, three resolved well in the electrophoresis. Peroxidase and esterase were polymorphic whereas leucine aminopeptidase was monomorphic.

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K. R. Ramesh , D. K. Khurana

Abstract

The ischolar_maining behaviour of Populus alba provenances in terms of their ischolar_main characteristics and ischolar_main pattern were studied. Among the different provenances of P. alba, the variation was observed in their ischolar_main characteristics in terms of the number of secondary ischolar_mains, number of tertiary ischolar_mains and their variation with respect to length of ischolar_mains, ischolar_main diameter, fresh ischolar_main weight and dry ischolar_main weight at 150 days and 210 days after planting. It was found that, amongst the different provenances the maximum ischolar_main characteristics were found in Raksham (H.P.), Tirith, Sumoor, Panamic and Tegger (Ladakh). These provenances were found to be effective and superior as compared to other in their ischolar_main characteristics. The simple correlation studies of ischolar_main characteristics revealed that number of secondary ischolar_mains, number of tertiary ischolar_mains, length of ischolar_mains, diameter of ischolar_mains, fresh ischolar_main weight and dry ischolar_main weight were positively correlated with each other. The ischolar_main pattern studies revealed that ischolar_main pattern remained consistent within a single provenance with less variation. Category 'C' ischolar_maining pattern was found in Bandipura, Sopore, Akpa, Raksham, Tabo, Shampuk and Alchi. So these can be utilized for block planting purposes where water level is high. However, provenances Skupiyan, Manali, Jungi, Morang etc. can be utilized under condition where there is loose soil and the moisture level is less and can perform well under (cold) desert conditions since category 'D' ischolar_maining pattern.

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R. C. Sharma , Sanjeev Sharma , D. K. Khurana

Abstract

Growing demand of Poplar wood for manufacture of fruit boxes, plyboard, match sticks due to its fast growth and colourless wood have led to extensive plantation of this species. This has resulted in severe outbreak of a number of diseases. Alternaria alternata is one of the most destructive pathogens of Populus species in nurseries resulting in premature defoliation. During 1997, an expcriment was conducted to assess 232 different cloneslhybrids of P. ciliata and P. deltoides against A. alternata. Out of 29 clones and 75 hybrids of P. ciliata, 3 clones and 22 hybrids remained free from the disease. In 11 clones and 2 hybrids of P. ciliata, disease reaction varied from resistant to moderately resistant. Out of 73 clones and 7 hybrids of P. deltoides, 64 clones and 7 hybrids remained free from the disease. All the 46 families of P. deltoides screened were found free from the disease.

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D. K. Khurana , Sanjeev Thakur

Abstract

A systematic study on the crossability pattern and the culture method to be adopted for crossing Populus ciliata was conducted. The results showed grafting to be the most suitable method for greenhouse crossing of P. ciliata. It was easily crossable with Tacamahacan poplar. The progeny of P. ciliata × maximowiczii could be successfully raised, and its hybrids have performed better than the parents in the initial growth trails within potential of being cultivated in the mid-West Himalayan zone.

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