• Volume 83, Issue 6

      June 1976,   pages  221-256

    • Effect of different light periods on the seed surface of fenugreek during the maturation phase

      H S Puri R Hardman

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      The seeds of a cultivar ofTrigonella foenum-graecum L., which have been producing hard seed in nature during several previous generations were grown in pots and allowed to remain in open till the pods were mature but green. At this stage the pots were transferred to the chambers of the green house with 4, 8, 12 or 16 hours of electric light. The seeds matured under these different light periods were studied with scanning electron microscope for their external morphology and also tested for their germination. The above light periods did not make any of the seeds hard but changed the structure of the apical protuberances of the palisade cells visible on the surface of the seed coat.

    • Phenolic acids in wheat and paddy rhizosphere amended with crop residue

      R P Pareek

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      Phenolic acids in the rhizosphere soil of wheat and paddy crops, amended with straw alone and straw in conjunction with nitrogen before 45, 30 and 0 days of sowing the crops were estimated by paper chromatography. Catechol,p-hydroxybenzoic,p-coumaric and vanillic acids were common to the rhizosphere of both the crops irrespective of straw and nitrogen treatments. Slightly high quantities ofp-hydroxy benzoic acid and catechol were encountered in wheat rhizosphere whereas in paddy rhizospherep-coumaric acid and catechol were more compared to other acids. Larger number of acids were encountered in wheat rhizosphere soil than paddy. Straw and nitrogen amendments appeared to have little effect on phenolic acid content in rhizosphere soil of both the crops.

    • Organic growth factor requirements ofPseudocercospora vitis (Lev.) Speg. andCercospora mitteriana Syd.

      G S Rawla S S Chahal T Singh

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      Pseudocercospora vitis requires thiamine (400 ppm), biotin (1 ppm), i-inositol (400 ppm). It, however, does not require pyridoxine, riboflavin, ascorbic acid, adenine sulphate, guanine, choline chloride, xanthine, folic acid, uracil and nicotinamide.Cercospora mitteriana requires thiamine (200 ppm), biotin (1–5 ppm), and riboflavin (10–50 ppm), but not i-inositol, pyridoxine, ascorbic acid, guanine, choline chloride, xanthine, folic acid, adenine sulphate, uracil and nicotinamide.

    • Mehler-type reagents in the enhancement of stomatal opening in epidermal strips

      V S Rama Das M Santhakumari

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      A substantial enhancement of the width of stomatal aperture was produced by methyl viologen (MV) a Mehler reagent, in isolated epidermal strips from the leaves ofCommelina benghalensis L., andPisum sativum L., other Mehler reagents, flavin mononucleotide and anthraquinone were also found to stimulate the opening process. Histochemical tests have revealed a much greater influx of K+ into the guard cells in presence of MV. Isolated mesophyll chloroplasts possessed appreciable activity of MV-supported photophosphorylation and of oxygen uptake through Mehler reaction.

    • Palaeontology of the Bagh Beds - Part V. Ostreina (i)

      G W Chiplonkar R M Badve

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      In this first ever detailed study of oysters from the Bagh Beds, a new genusIndostrea, characterised by small shell, development of chomatal pits all along the margin and absence of radial ornament, and its seven species are described.

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