• Volume 94, Issue 1

      March 1985,   pages  1-84

    • Foreword

      S Ramaseshan

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    • The structure of the pod in two species ofProsopis

      S Rangayya I L Kothari G L Shah

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      The structure of the stipe and basal, middle and apical regions of the pod is described. The older stipe shows secondary growth as in a dicotyledonous stem. The stipe at its junction with the valves shows three vascular bundles, one large and two small, arranged in a triangular manner, with 3–5 lateral bundles inProsopis juliflora. The mature pericarp ofP. cineraria has one dorsal and two ventral vascular sutural bundles, but inP. juliflora there is a pair of vascular bundles in each suture. The valvular structure can be distinguished into one layered epicarp, multilayered mesocarp and few to many layered endocarp. The outer mesocarpic layers and all endocarpic layers are sclerenchymatous inP. juliflora but only the endocarpic layers are collenchymatous inP. cineraria. Within the circumscription of structural types of pod described by Fahn and Zohary (1955), theTrifolium type (form d) is found inP. cineraria and theCyanophyllum type inP. juliflora. Taxonomic importance of anatomical characters is brought to light to separate the two taxa.

    • Studies in Cyperaceae: XIX. Species novarum Cyperacearum in memoriam optimi Professoris Swamy

      E Govindarajalu

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      Five new species belonging toBulbostylis, Eleocharis, Fimbristylis, Fuirena andScleria respectively have been proposed to immortalize late Prof. Dr Swamy for his valuable botanical and nonbotanical contributions. The vegetative anatomy of these new species has also been studied which shows an overall agreement with the general anatomical characters of each one of the genera besides the occurrence of a few characters specific for each species.

    • Factors controlling callus initiation, growth and plant regeneration in breadwheat (Triticum aestivum L)

      Susan Eapen P S Rao

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      Callus cultures were initiated from immature embryos and seeds of bread wheat. The frequency and intensity of callus development were found to be best when embryos were oriented with the scutellum facing up and the embryonal axis in contact with the medium. Callusing frequency was also enhanced when embryos, were cut longitudinally into two halves and cultured. Agar-solidified medium produced a better frequency of, embryo response compared to stationary liquid cultures. Increasing levels of glucose and sucrose caused a decrease in fresh weight and a sharp increase in dry weight. Addition of coconut water, yeast extract, malt extract, amino acids and triacontanol was either without effect or were inhibitory for growth of callus. Histology of regeneration from embryo-derived callus showedde novo differentiation of shoot buds and roots. No evidence for somatic embryogenesis was observed.

    • Accumulation of nitrite as influenced by fluchloralin and benthiocarb in two tropical weed species

      N V R Reddy K R Rao

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      Fluchloralin (N propyl-N (2 chloromethyl-2,6-dinitro-4-trifluromethylaniline)), a dinitro-aniline type of herbicide having an inhibitory effect on light reaction, results in accumulation of higher levels of nitrite in light than in dark. In contrast, benthiocarb (S-(4-chlorobenzyl)-N-N-diethyl thiocarbamate), a non-photosynthetic herbicide and uncouplar of oxidative phosphorylation causes higher accumulation of nitrite in dark than in light in both test species. Thus the latter is effective on nitrate metabolism than on nitrite metabolism. The effect of herbicides onAcalypha is more pronounced than onTridax.

    • Effect of carbonate and bicarbonate on growth and sporulation in two blue-green algae

      T A Sarma Raj Garg

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      Growth and sporulation of two blue green algaei.e., Anabaena torulosa andNostoc calcicola have been studied in carbonates and bicarbonates.A. torulosa did not show any preference for growth in either the carbonates or the bicarbonates. In contrast,N. calcicola exhibited faster growth rate in carbonates and bicarbonates as evidenced by the specific growth constants and generation time. Induction of sporulation was noted by 8th day inA. torulosa in carbonates and bicarbonates over the basal medium (20 days). Ammonium carbonate supported the formation of maximum number of spores. However,N. calcicola did not show any induction of sporulation. A comparison of glycogen levels between the two algae during sporulation revealed high glycogen content with concomitant spore induction in ammonium carbonate inA. torulosa. Although,N. calcicola showed a concentration dependent increase in glycogen content in carbonates and bicarbonates, no sporulation occurred.

    • Seedcoat micromorphology of Caryophyllales: Observations on some Molluginaceae

      V V Sivarajan M C Gopinathan

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      The seeds of Caryophyllales are suitable materials for micromorphological studies and might possibly yield valuable taxonomic information. This paper deals withSEM studies on the seedcoat patterns of nine species of Molluginaceae. The findings support the generic delimitations and are highly useful in infrageneric classification, as well.

    • Nitrogen fixation byNostoc strains

      N Jayasankari S Shanmugasundaram

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      Seven strains ofNostoc were examined for their nitrogen fixing potential in the presence and absence of NO3, NH4+ and oxygen. The strains not only showed differences in their nitrogen fixing potential, but also with respect to their response to combined nitrogen and oxygen. Based on their nitrogen fixing potential the strains were grouped as low, moderate and high fixers.

    • Pharmacognostic studies on ‘Dravanti’ part-IJatropha curcas Linn.

      R C Gupta

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      ‘Dravanti’, an important Ayurvedic drug, has variously been ascribed to different botanical taxa,Jatropha curcas Linn. being one such species. A detailed pharmacognosy of the vegetative parts of the above species has been dealt with in the present paper. The study has revealed that such characters as the presence of 9 leaf traces in the basal parts of the petiole, mixed anisocytic and paracytic stomata with stomatal index 7·3 and 12 for the upper and the lower leaf surfaces respectively, funnel-shaped multiseriate phloem rays demarcating the phloem into wedge-shaped masses in both the root and the stem, diffused porous wood with diffused apotracheal parenchyma and 1–3 seriate xylem rays along with certain physicochemical constants and fluorescence tests can provide useful parameters for differentiating this species from other implicated taxa.

    • Dedication

      H Y Mohan Ram

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