• Volume 97, Issue 6

      December 1987,   pages  443-503

    • Chemosystematics of some species ofIndigofera

      S M J Anuradha B K Vijay Kumar M Radhakrishnaiah L L Narayana

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      The distribution pattern of phenolic constituents in 8 species ofIndigofera is studied. There is uniform occurrence ofp-coumaric,p-OH benzoic and vanillic acids and an unknown phenolic compound ‘e’ of hRf value 42/57 in all the taxa studied. There is a chemical similarity betweenIndigofera hochstetteri andIndigofera tinctoria. Indigofera dalzellii, Indigofera hirsuta, Indigofera oblongifolia andIndigofera prostrata stand out in the unique possession of certain compounds. The overlapping incidence of the constituents indicates the fairly close chemical ties among the species studied. The cluster analysis reveals that it supports earlier sub divisions of the genus to some extent.

    • Structure and development of stomata on the fruit wall ofCalotropis procera (Ait.) R. Br.

      Yash Dave P M Kuriachen

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      The epidermal characters ofCalotropis procera (Ait.) R. Br. fruit have been investigated. Stomata being present only in the outer epidermis of the epicarp, the fruit is called exostomatic. Only the perigenous type of stomata are present on the fruit wall. Stomatal abnormalities like single guard cell, aborted guard cell, contiguous stomata, paired stomata, unequal guard cells, stomatal connection with distinct tube and stomata with large meristemoid are observed. Inner epidermis shows a ‘parquetry pattern’ of its cells. The outer epidermis is hairy but the inner epidermis is atrichomal and nonstomatiferous. The cuticle is thick, with numerous striations.

    • Effect of benthiocarb on epicuticular wax and silica content in rice and barnyard grass

      T Rajendra Prakash P M Swamy

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      The effect of benthiocarb [S-(4-chlorobenzyl)-N, N-diethylthiocarbamate] at 1500 ppm on the levels of epicuticular waxes and silica content was studied to understand the differential sensitivity of rice and barnyard grass. The herbicide significantly inhibited the synthesis of epicuticular wax in barnyard grass. A high silica content was observed in the rice. The differences to the extent of synthesis of epicuticular wax and the levels of silica might be the causative factors for the differential sensitivity of rice and barnyard grass to benthiocarb.

    • Embryology ofApluda mutica (Poaceae)

      R K Bhanwra Promila Pathak

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      In 3 populations ofApluda mutica, a useful forage grass, the anther wall is 4-layered and its development corresponds to the Monocotyledonous type. Successive cytokinesis in microspore mother cells results in isobilateral tetrads of microspores. Pollen is shed at 3-celled stage. The female gametophyte is of the monosporic Polygonum type. Megaspore tetrads and female gametophyte degenerate at different stages of development and this results in poor seed set. The ovule is bitegmic, pseudocrassinucellate and hemianatropous. The integuments and the nucellus get consumed after fertilization. The pericarp forms a thin-layer around the endosperm and mature embryo and the latter is of the panicoid type.

    • Bacterial associates of the slime mouldPhysarum nicaraguense Macbr.

      R Venkataramani Liziamma Daniel

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      The swarmers, myxamoebae and plasmodia ofPhysarum nicaraguense were associated with two kinds of gram-negative, rod-shaped bacteria, one occurring as transparent, glistening, greyish white colonies and the other as mucoid, smooth colonies. Biochemical tests on these two bacteria revealed that they belonged to species ofProteus andKlebsiella.

      When theseProteus andKlebsiella species were streaked together or separately on water agar plates with small weak plasmodia, plasmodia grew vigorously along the bacterial streaks. When heat-killed bacteria were streaked together or separately, the weak plasmodia did not grow but moved away from the streaks, thereby showing negative taxis. The association seems to be more complex than mere predation.

    • Effect of bottle gourd mosaic virus on powdery mildew development in bottle gourd (Lagenaria siceraria (Mol.) Standl.)

      Jamshid Hayati Narayan Rishi J N Chand

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      Bottle gourd mosaic virus infection on the leaves of bottle gourd delayed the appearance ofSphaerotheca fuliginea (SCH.) POLL., colonies when inoculated on the same leaves. This delay varied depending upon the time interval between virus and fungus inoculation. Development of powdery mildew colonies on bottle gourd mosaic virus inoculated leaves were lesser compared to the healthy leaves inoculated only withSphaerotheca fuliginea. At the time of appearance the colony of fungus covered 2% of leaf area. After one month, it covered almost entire leaf surface, when inoculated on healthy leaves. Progress of fungal colony was checked on bottle gourd mosaic virus inoculated leaves, depending upon the time interval between inoculation of virus and fungus.

    • Species of the lichen generaBacidia, Badimia, Fellhanera andMycobilimbia from India

      D D Awasthi R Mathur

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      Morpho-taxonomic studies of 18 species ofBacidia, 1 species ofBadimia, 4 species ofFellhanera and 3 species ofMycobilimbia known from India have been presented in the paper. A new variety,Bacidia fusconigrescens var.oleosa Awas. is described and 2 new combinations in the genusMycobilimbia philippina (Vain.) Awas. andMycobilimbia sphaeroides Awas. nom. nov. have been made.


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