• Y S Murty

      Articles written in Proceedings – Plant Sciences

    • Morphological studies in Meliaceae. II. A reinvestigation of floral anatomy of members of Swietenieae and Trichilieae

      Y S Murty Sushma Gupta

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      The floral anatomy ofSwietenia mahogoni Jacq.,Soymida febrifuga Juss.,Chukrassia valutino A. Juss.,Dysoxylum binectariferum Hook.,Aphanamixis rohituka W. & A. andHeynea trijuga Roxb. are discussed. Calyx is supplied by two whorls of traces inSwietenia, Aphanamixis, Chukrassia andHeynea and only one whorl of traces inSoymida andDysoxylum. In all the species, exceptHeynea, petals receive their supply independently. InHeynea petals receive their supply from compound strands. Staminal tube receives its supply from compound strands inSwietenia,Chukrassia, Heynea, Aphanamixis and from independent strands inSoymida andDysoxylum. Anthers are syngenesious inDysoxylum.

      Ovary is supplied only by carpellary ventrals inSoymida, carpellary ventrale and ovary wall traces inSwietenia, carpellary ventrals, ovary wall traces and carpellary dorsals inChukrassia and carpellary ventrals, ovary wall traces, carpellary dorsals and secondary marginals inAphanamixis, Dysoxylum andHeynea. Disc is considered receptacular. Ovary is 2–5 locular at the base but becomes unilocular above. InChukrassia it remains tetralocular throughout. Ovules show attachment to axile placentae inChukrassia, Heynea andAphanamixis and to parietal placentae inHeynea,Soymida, Dysoxylum andSwietenia. Non-vascular, 8–20 teeth-like structures are formed from staminal tube. These are interpreted as fused or interpetiolar stipules.

    • Embryological studies in the Composite Astereae-II

      H P Sharma Y S Murty

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      The embryology ofFelicia bergeriana O. Hoffm,Conyza stricta Willd. andErigeron bonariensis L. has been studied. The anthers are tetrasporangiate inC. stricta andF. bergeriana and bisporangiate inE. bonariensis. The anther wall consists of epidermis, endothecium, middle layer and tapetum. Binucleate, tetranucleate and 12 nucleate tapetal cells have been observed respectively inE. bonariensis,C. stricta andF. bergeriana. The tapetum forms periplasmodium and endothecial thickenings are formed in all the species studied. Pollen grains are shed at 3 celled stage. The ovule is anatropous, unitegmic and tenuinucellate. The mature embryo sac is 8 nucleate polygonum type in all the species studied. As many as 6 antipodal cells inErigeron bonariensis and 12 inC. stricta are observed due to secondary multiplication. InF. bergeriana the antipodal cells become 2–4 nucleate. The persistence of antipodal tissue and its penetration into chalazal region confirm haustorial nature. The endosperm is nuclear inE. bonariensis andC. stricta and cellular inF. bergeriana. The outer cells of endosperm form jacket layer which persists surrounding the mature embryo. The embryo development is of the Asterad type and resembles the Senecio variation.

    • Nodal anatomy in Trifolieae

      Mohini Gupta Y S Murty

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      A trilacunar, three traced stipulate node is observed in 36 species studied representing all the six genera of Trifolieae. Most of the species ofTrifolium agree in the splitting of the median at the base into three, in the presence of five bundles at the base of the petiole and in their formation. Thus they appear to be distinct from others.

    • Some histochemical observations on leaf abscission zone inCapsicum annuum L.

      Karan Singh Y S Murty

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      The present observations were conducted on NP 46-A and Pusa jwala varieties ofCapsicum annuum L. Investigations on changes in cell wall components of the cells of leaf abscission zone associated with the process of abscission were based on specific qualitative histochemical staining procedures. It was observed that the loss of pectic and cellulosic substances preceded the separation phase of abscission from middle lamella and cell walls of the cells of separation layer of abscission zone. The abscission zone was characterized by thin cutin deposition on epidermal cells and poor lignification in vascular elements of this region. Separation of senescent part of petiole was followed by deposition of suberin in cells of some outer layers of abscission zone and by the deposition of lignin in cells of the remaining layers of abscission zone to form a protection layer on exposed part of petiole stump. Development of tyloses, tannins and calcium oxalate crystals was not found associated with abscission in the present plant material.

    • Petiolar abscission responses to hormonal treatments inCapsicum annuum L. varieties

      Karan Singh Y S Murty

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      Debladed petioles of pot cultured plants, entrained into one-stemmed habit and two-stemmed habit of PN-46-A and Pusa jwala varieties of Chilli (Capsicum annuum L.) were treated with lanolin+growth hormone emulsion. It was observed that morphactin, cytokinin and auxin retarded petiolar abscission in both the varieties and methods while ethylene, gibberellin, abscisic acid and ascorbic acid accelerated the abscission of all the petioles tested for the purpose. Relative merits and demerits of the methods used are discussed in relation to alternate leaf arrangement in the present experimental plant material.

    • Morphology, anatomy and development of bulbil in some dioscoreas

      Y S Murty Purnima

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      Bulbil, the aerial propagating structure of dioscoreas appearing in the axil of leaf or bract, shows diversity in its size and form. The morphology, anatomy and development of bulbil in 11 species ofDioscorea is described. The bulbil resembles the tuberous underground stem in having cork, cork cambium and parenchymatous ground tissue with scattered vascular bundles. The bulbil develops as a composite structure due to diffused growth of more than one accessory bud arising on the abaxial side of the axillary bud.

    • Abscission responses of petiolar explants ofCapsicum varieties to treatments with growth substances and their combinations

      Karan Singh Y S Murty

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      The abscission responses of petiolar explants of NP 46-A and Pusa jwala cultivars of chilli (Capsicum annuum L) to proximal and distal applications of growth substances were investigated. Ethephon, abscisic acid and ascorbic acid proved to be accelerants of abscission irrespective of age of explants and site of application. The synthetic auxin (naphthalene acetic acid) retarded abscission in younger explants regardless of the site of application but in the older explants proximal application of the auxin promoted abscission while distal application retarded the process. Gibberellic acid showed effects opposite to those caused by the auxin. The proximal application of gibberellic acid retarded abscission irrespective of age of explants while distal application effectively accelerated abscission. The cytokinin (benzyl adenine) and morphactin delayed abscission of petiolar explants on distal as well as proximal applications. The abscission responses to combinations of growth substances were highly variable depending on the age of explants, site of applications and varietal source of experimental material. The morphactin and benzyl adenine exhibited additive interaction in retarding the abscission up to such extent that ethephon and abscisic acid could only partially counteract their effects in combination of two growth substances. The auxin and gibberellin showed irregular and mixed interactions with other bioregulants studied.

    • Effect of different growth substances on the foliar stomata ofTagetes erecta L

      Vidhu R K Sharma Y S Murty

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      The response of abaxial and adaxial stomata to various growth substances were examined in leaves ofTagetes erecta L. From stomatal studies it is clear that growth substances produced several variations in the morphology of stomata. The anomalies recorded include persistent stomatal initial, loss of one or both guard cells in a significant percentage of stomata, contiguous stomata, cytoplasmic connections, one and a half contiguous stomata etc. Significant changes in frequency of epidermal cells and stomata, size of epidermal cells and stomata and stomatal index were noticed in various treatments.

    • The interrelationship of growth substances and stomatal characters inGossypium hirsutum var H-777

      R K Sharma Y S Murty

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      Various types of stomatal abnormalities like persistent stomatal initials, single guard cells, degenerated guard cells and contiguous stomata with contiguity in different directions were recorded due to the treatment of different growth substances. Growth substances also altered the stomatal size, epidermal cell size, stomatal frequency, index and length-to-breadth ratio. It seems that the effect of these substances starts from the stomatal ontogeny and continue up to the last phase of development leading to such variations.

    • Effect of some growth regulators on the leaf architecture ofTagetes erecta L.

      Vidhu Y S Murty

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      Several leaf deformities viz bilobed leaf segment, asymmetrical leaf base, unsegmented simple leaves etc, accompanied with changes in leaf architecture were observed inTagetes erecta L. plants sprayed with aqueous solutions of different growth substances namely Indole-3-acetic acid, Gibberellic acid, 2,3,5-triiodobenzoic acid and Kinetin. The major changes include the gradual conversion of segmented simple leaf into an unsegmented one owing to 2,3,5-triiodobenzoic acid spray treatment.

    • Leaf architecture in Tamaricaceae

      A K Gupta Y S Murty

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      The leaf architectural pattern in 6 species ofTamarix and two species ofMyricaria has been investigated. The leaves are simple, alternate and sessile. InTamarix aphylla, Tamarix dioica, Tamarix gracilis andTamarix troupii the leaves are completely or partially sheathing. In these species only the primary vein is distinguishable, the secondaries and the further orders of venation being not distinguishable from one another. In the other two species ofTamarix and inMyricaria the major venation pattern is pinnatecamptodromous type. The intercostal venation is of random reticulate type, and the marginal ultimate venation is incomplete. The areoles are polygonal to irregular in outline and randomly oriented. They may contain one or more veinlets or none. There is no direct correlation between the size of an areole and the number of vein endings. Hence, these characters cannot be said to be taxonomically significant as far as the species ofTamarix andMyricaria are concerned.

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