Joginder Singh , R. Raina , A. Rajasekaran

Abstract

Hypericum perfortaum L. (Family: Hypericaceae), commonly known as "St. John's Wort" is an important medicinal plant valued for its anti-depressant activity. In the present work role of GA₃ application and time of seed sowing on seed germination of Indian populations of Hypericum perforatum growing in Himachal Pradesh was studied. Seeds were sown on four different dates viz D₁ (February 13), D₂ (March 1), D₃ (March 15) and D₄ (April 1) and treated with different concentration of GA₃ solution. The results showed that seeds sown on 15th March (D₃) gave the maximum germination of 57.15 per cent, shortest peak germination period of 21.55 days (D₃), the earliest germination initiation of 14.4 days and the shortest seed germination period of 33.55 days (D₃). Seeds treated with 150 ppm GA₃ (T₄) gave the highest seed germination percentage (45.63), which is significantly higher than 29.19 per cent seed germination in untreated seeds. The results suggested that time of sowing have a positive effect on seed germination and seedling vigour in Hypericum perforatum L.

Keywords

, Time of Sowing, Himachal
Pradesh

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Avinash Bohra , Nishi Mathur , Sachendra Bohra , Joginder Singh , Anil Vyas

Abstract

The efficiency of eight arbuscular mycorrhizal species collected from rhizosphere soil of Terminalia arjuna L. from Indian Thar desert was tested. Mycorrhizal colonization resulted in increased accumulation of nutrients, chlorophyll, carotenoids, sugars and proteins. Among the eight AM fungi used, Glomus fasciculatum (Thaxter sensu Gerd.) Gerd. & Trappe proved to be the most efficient.

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J. B. Lal , Joginder Singh , A. K. Gulati , R. C. Prajapati

Abstract

Though forests are considered a valuable and renewable resource, yet its exploitation for quick monetary gains has been going on unabated. Large scale deforestation all over the country has attracted wide attention of the people and the Government. For taking remedial measures, it is necessary that extent of deforestation that is taking place be monitored. Comparison of multi-date remotely sensed data offers a tool to study and identify deforestation sites. In the present study, extent of deforestation in Kodagu district of Karnataka between 1982 and 1986 has been assessed by interpreting MSS satellite images on 1: 250,000 scale.

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Joginder Singh , A. Rajasekaran , R. Raina , R. Rana

Abstract

The present study evaluated different collections of Hypericum perforatum L. growing in Himachal Pradesh for biomass yield and hypericin content. The maximum fresh weight (49.98 g/plant) and dry weight (16.04 g/plant) was recorded in Hyp-V collected from Dochidhar area of Shimla District while Hyp-Vl collected from Koftdhar had maximum height (59.46 em). The maximum hypericin (0.109 percent) was recorded in Hyp-II and Hyp-VlI collections.

Keywords

Medicinal Plant, Hypericin, Fresh and Dry Weight

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