Informatics Publishing Limited

Virendra Singh , S. K. Lavania , V. K. Sah , Shashi Kumar

Abstract

The present study was conducted to find out the optimum time of seed (fruit) collection in Fraxinus micrantha. The fruits were collected at fortnightly interval. The results of the present study revealed that the maximum germination of 44.50 per cent was found in treatment T₃ (15th October collection or 180 days after anthesis) at a time when the fruit colour changed from green to grey orange. The moisture and dry weight/l00 seed at this stage was 17.82 per cent and 1.40 g, respectively. The shoot length, ischolar_main length, shoot dry weight and ischolar_main dry weight of 45 days old seedlings were also found better in this treatment. Therefore, the seeds of this species should be collected in the second fortnight of October (180 days after anthesis) at a time when the fruit colour changed to grey orange for better germination, seedling growth and vigour index.

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S. K. Lavania , R. P. Singh , Virendra Singh

Abstract

The present study was undertaken to assess the effect of different concentrations of gibberellic acid treatment and pH solution on germination and germination value in Pinus wallichiana. The results of the study clearly indicated that the seed germination was hastend to maximum by the application of 300 ppm GA₃ for 24 hours or 200 ppm GA₃ or 36 hours indicating thereby that as the soaking period increased, GA₃ concentration decreased. Germination value also followed the same trend. The maximum germination and germination value was obtained at pH 6.0.

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S. K. Lavania , Virendra Singh , Birendra Prasad

Abstract

The present study deals with the effect of cone collection date on seed and germination characteristics in blue pine (Pinus wallichiana). The first cone collection was done on 15^th September, second on 30^th September, third on 15^th October and fourth on 30^th October from Gangotri range of Uttarkashi Forest Division of Garhwal Himalaya. Percentage of viable seeds, per cone increased while percentage of non-viable seeds per cone decreased with the maturity of cone. Mean fresh weight of 100 seeds increased from first to fourth (last) cone collection date. The moisture content of seeds decreased while seed germination increased as cone collection dates progressed. Germination per cent and germination value of seeds steadily increased from cone collection date of 15^th September to 30^th October. Therefore, the cones should be collected in the last week of October to obtain quality seeds.

Keywords

Cone collection, Blue pine, Pinus wallichiana, Seed Germination

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Virendra Singh , S. K. Lavania , V. K. Sah

Abstract

The results of the study revealed that the cone length (11.54 cm), cone diameter (6.10 cm), number of fertile scales/cone (246.96), total number of scales/cone (282.28), number of seeds/cone (472.27) and weight of seeds/cone (71.50 g) were highest for the cones which were collected from upper crown. The seed length (15.45 mm), width (5.01 mm), thickness (3.50 mm), fresh (15.04 g) and dry weight of 100 seed (11.72 g) were also found maximum of those seeds which were extracted from the cones collected from upper crown. The maximum germination (64.00 %) was obtained from the seeds extracted from the cones collected from upper crown under laboratory condition and was significantly higher than the germination of seeds from middle crown and lower crown. The results of germination in nursery revealed almost the same trend but the values of different parameters were less than the values obtained under controlled conditions.

Keywords

Crown position, Cone length, Seed length, Seed width, Seed germination

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