2. Institutional Publications

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Author: search.filters.author.Mercy, S T

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    Effects of colchicine and the induction of polyploidy in sorghum (sorghum vulgare pes.)
    (Kerala Agricultural University, 1979) Miranda, J H; Mary K, George; Mercy, S T
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    Studies on pollen tube growth amd in vitro storage of pollen grains in Cicer arietinum L. and C. Soongaricum J & S
    (Kerala Agricultural University, 1979) Mercy, S T; Kakar, S N; Verghese, T M
    Pollen storage experiments showed that pollen of C. arietinum and C. soongaricum could be successfully stored below 0° for upto 40 or more days if necessary. In vitro pollen germination and tube growth studies showed best germination in 0.5 M sucrose 100ppm boric and medium. Boric acid increased the germination percentage significantly in both species as compared to the germination percentage in sucrose alone, thus indicating the presence pollen dimorphism is C. arietinum and C. soongaricum.
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    Pollen germination and tube growth of the incompatible pollinations of strain Kanpur lotni x Kanpur lotni belonging to Brassica campestris L.
    (Kerala Agricultural University, 1974) Mercy, S T
    In the incompatible pollination of strain Kanpur Lotni x Kanpur Lotni of B. campestris, the inhibitory substnnce preventing self-fertilization was found to be concentrated on the stigma and the stylar region adjacent to it. Applying the pollen grains directly on the stylar tissue after removal of stigma was found to by-pass the stigmatic barrier and thus allowed normal pollen tube growth, fertilization and seed set.
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    Anatomical studies of the aerial stem, rhizome, leaf sheath and root of elettaria Cardamomum (Maton)
    (Kerala Agricultural University, 1977) Mercy, S T; Luckins, C Babu; Mary, K George
    The detailed anatomy of the aerial stem, rhizome, leaf sheath and root of cardamom is studied in the present investigation. The aerial shoot has a typical monocotyledonous stem known as 'culm' with nodes and inter-nodes protected by long sheathing leaf bases. In the rhizome the nodes and internodes are crowded together. It can be differentiated from the aerial stem due to the presence of scale leaves and adventitious roots. The aerial stem, rhizome, leaf sheath and root have typical monocotyledonous anatomy.
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    Studies on interspecific hybrids of five species of Capsicum with special reference to its qualitative and quantitative characters
    (Kerala Agricultural University, 1977) Somanatha Pillai, E R; Mary K George; Mercy, S T
    Investigations on the inheritance of quantitative and qualitative characters and hetrosis among five species of Capsicum were carried out in the present study. Though crosses were made in all combinations, there was fruit setting in only ten crosses. Of these 2 crosses produced no viable seeds and in another cross, the seedlings did not survive. C anmtum as female parent failed to cross with any other species In the cross CF x CP, the embryo started normal development but collapsed in the early stage The F, hybrids exhibited heterosis for several economically desirable characters. All the hybrids showed a conspicuous reduction in the number and germination capacity of I1 ' , and I , seeds. Among the seven hybrids studied, the best economic combinations were Capsicum frutescens X C. baccatum and C. pendulum X C. microcarpum. These results indicate the possiblity of selecting desirable typss combining the economic attributes of both the parents from the segregating generations and by back crossing.
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    Crossability studies and analysis of incompatibility in three species of capsicum
    (Kerala Agricultural University, 1977) Radhakrishnan, K P; Mercy, S T; Mary K George
    In the present study interspecific hybridization could be successfully done among 3 species of Capsicum viz., C. annuum, C. fruiteseens and C. pendutum by the technique of cross pollination after amputation of the upper part of style along with the stigma followed by application of 5% sucrose solution on cut surface of the style. Embiyological analysis of the fertilized ovaries of self and cross combinations showed that in the incompatible combinations the embryosacs degenerated indicating failure of fertilisation. Further when pollination was done on the cut surface of the amputated styles after the application of 5% sucrose solution normal embryo development could be observed as in the case of selfed ovaries.
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    Anthesis in Indian lemongrass Cymbopogon Flexuosus, stapf
    (Kerala Agricultural University, 1979) Mercy, S T; Gopinathan Nair, V; Luckins C Babu
    Studies were undertaken on the mechanism of anthesis in Indian lemongrass. An inflorescence takes 25 to 32 days for completion of anthosis. The peak period of anthesis is from the 6th day from commencement of anthesis to the 11th day. About 80% of spikes complete anthesis by the 15th day. Anthesis takes place in the morning between 7 and 8.30. !n the sessile spikelets anthesis appears earlier than its appearance in the pedicellate ones. There are four distinct stages in the anthesis of sessile spikelet which take plrce one after the other in quick succession. The most characteristic featrue of anthesis is the slight protogynous nature of the sessile spikelet. Though this is a basic adaptation for cross pollination, the large number of spikeleis opening in a short span of time indicate the possibility for self pollination under field conditions.
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    Floral biology of Indian lemongrass Cymbopogon flexuosus stapf
    (Kerala Agricultural University, 1982) Luckins C Babu; Mercy, S T; Gopinathan Nair, V
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    Pollen studies in anthurium andreanum lin.
    (Kerala Agricultural University, 1996) Bindu, M R; Mercy, S T
    Floral biology and pollen characters of five varieties of Anthurium andreanum Lin. have been studied. It was observed that the species is protogynous. Anthesis occurred during early morning hours. The plant produces a large number of pollen grains per anther which are more or less uniform in size, round in shape with a single germ pore. Only a small percentage of pollen grains is fertile which reflects the hybrid nature of the species. Determination of pollen fertility by in vitro pollen germination method is found to be more accurate than by acetocarmine staining.
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    Pollen studies in Anthurium andreanum Lin.
    (Kerala Agricultural University, 1996) Bindu, M R; Mercy, S T
    Floral biology and pollen characters of five varieties of Anthurium andreanum Lin. have been studied. It was observed that the species is protogynous. Anthesis occurred during early morning hours. The plant produces a large number of pollen grains per anther which are more or less uniform in size, round in shape with a single germ pore. Only a small percentage of pollen grains is fertile which reflects the hybrid nature of the species. Determination of pollen fertility by in vitro pollen germination method is found to be more accurate than by acetocarmine staining