P. S. Rawat , Nidhi Punj , Fakir Chand

Abstract

A study was conducted to assess seasonal distribution and infection intensity of ectomycorrhizae in Chir pine (Pinus roxburghii Sargt.). Maximum number of mycorrhizal ischolar_mains were observed to be highest during monsoon season (July, August and September). Dead mycorrhizal ischolar_mains were noticed to be maximum during summer. Per cent occurrence and death rate of mycorrhizae were observed maximum in the month of October. No specific patterns of increase and decrease of mantle thickness during various months were noted while the mantle thickness was found maximum in the month of October. The intensity of hartignet penetration was recorded maximum in the month of June and lowest in August. Overall, eight different types of mantle were observed in Chir pine forest. Positively significant correlation was estimated between available phosphorus and live mycorrhiza(P

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P. S. Rawat , Nidhi Punj

Abstract

Seasonal distribution of ectomycorrhizae in Deodar (Cedrus deodara) forest of Nainital hill of Central Himalayas has been assessed in relation to their soil characteristics. The occurrence of mycorrhizae in per 100g of soil was recorded to be highest in the month August and lowest in January. The per cent occurrence and attrition rate (live/dead) of ectomycorrhizae were also reported to be maximum in the month of August and minimum in January. Although no specific trend of increase and decrease in mantle thickness and Hartignet penetration was observed, however, the mantle thickness and Hartignet penetration were reported to be maximum in the months of November and May respectively. Linear regression between ectomycorrhizal counts and some of the soil characteristics have shown positively significant correlation (p < 0.001) between available P and live mycorrhizae. Negatively non-significant correlation was found between soil pH and total mycorrhizae. Moreover, positively significant correlation was observed between soil N and C : N with live mycorrhizae (p < 0.01) and that of P < 0.01 between soil moisture and live ectomycorrhizae.

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P. S. Rawat , Nidhi Punj , Kirti Joshi , N. S. K. Harsh

Abstract

Seeds collected from different sources of Pinus roxburghii from Himachal Pradesh, Uttaranchal, J&K and Nepal were evaluated for the occurrence of seed mycoflora. A total of twelve species belonging to nine fungi were isolated of which species of Aspergillus and Penicillium were dominant. Seed source Rajgarh Himachal Pradesh was found to be infested with maximum number of eight fungi, while in seed source of Uttarkashi (Uttaranchal) two fungi namely A. niger and A. flavus were recorded.

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