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A. Sinhababu , A. Banerjee , R. K. Kar

Abstract

Seed germination and seedling growth were studied in seven fast growing fuelwood yielding leguminous trees, viz. Acacia auriculiformis, Acacia holosericea, Albizia lebbek, Bauhinia variegata, Cassia fistula, Cassia siamea and Leucaena leucocephala. To improve the low germination rate, seeds of these species were either incubated in light (in 8 h daily cycle) or pretreated with hot water (80°C for 5 minutes) or with phytohormones (IAA and GA) and nitrogenous substances (potassium nitrate and thiourea). Significant increase in germination percentage over control was observed in all species with hot water pretreatment. Light alone could not improve germination; however, it became effective in seeds pretreated with hot water. Pretreatment with hormone and nitrogenous substances also showed limited improvement in germination in some cases. Seedling growth was comparatively high in B. variegata and A. lebbek, which may be correlated with higher seed weight in these species.

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R. K. Kar , J. P. Mandal

Abstract

no abstract

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P. K. Raha ¹, C. P. Rajendran ², R. K. Kar ³

Affiliations
1 Geological Survey of India, Calcutta, IN
2 Centre for Earth Science Studies, Trivandrum, IN
3 Birbal Sahni Institute of Palaeobotany, Lucknow, IN

Abstract

Eocene palynofossils are reported for the first time from a bore hole core drilled near Ambalapuzha in Alleppey District, Kerala between the depths of 400-571 m. Characteristic pollen genera recovered are: Palmaepollenites, Couperipollis, Proxapertites, Meliapollis, Striacolporites, Retistephanocolpites etc.

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R. K. Kar ¹, K. Ambwani ¹, D. Dutta ¹, Ratan Kar ¹

Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow - 226 007, IN

Abstract

The Um Sohryngkew river section at Therriaghat, Meghalaya, exposes Mahadeo (Maastrichtian) and Langpar (Danian) Formations extensively. The palynological investigation of the topmost Mahadeo and lowermost Langpar reveals an abrupt change in palynoflora at the formational boundary. The Maastrichtian index palynofossils viz. Azolla cretacea, Ariadnaesporites ariadnae, Mulleripollis bolpurensis etc. disappear at the uppermost Mahadeo. At the basal Langpar the assemblage is dominated by fungal and algal elements. On this basis the palynofacies turnover is demarcated within a 40 cm thick calcareous sandy shale underlain by the 3 cm thick highly carbonized shale. The palynological boundary corresponds with the lithological one demarcated by Pandey(1978, 1981), and is located 10 m above the foraminiferal, nannofossil, dinoflagellate boundary approximating the iridium rich level. The palynological data suggest no major catastrophic event at the iridium level with the major taxa continuing through. The major palynological break reported in this paper is at formational boundary and may be facies controlled as well.

Keywords

Palynology, Mahadeo-Langpar Formations, Iridium Layer, K/T Boundary, Um Sohryngkew River, Meghalaya.

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R. K. Kar ¹, A. K. Srivastava ¹, N. C. Mehrotra ², S. N. Swamy ², R. S. Rawat ²

Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow - 226 007, IN
2 Keshab Dev Malviya Institute of Petroleum Exploration, Oil and Natural Gas Corporation Limited, Kaulagarh Road, Dehra Dun - 248 195, IN

Abstract

No Abstract.

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R. S. Singh ¹, R. K. Kar ¹

Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow -226 007, IN

Abstract

The Deccan Intertrappean Beds exposed about 3 km north-east of the Papro village, Lalitpur District, Uttar Pradesh, were palynologically investigated. The assemblage comprises Palaeocene marker species like Dandotiaspora dilata and Dandotiaspora pseudoauriculata along with Lakiapollis ovatus and Spinizonocolpites echinatus. On this basis, a Palaeocene age is ascribed for this intertrappean bed.

Keywords

Deccan Intertrappean Beds, Palynology, Palaeocene, Lalitpur, Uttar Pradesh.

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