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Articles by R. Manohar Reddy
Total Records ( 5 ) for R. Manohar Reddy
  G. Lokesh , Putkho Paul Pao , K.N. Madhusudhan , P.K. Kar , A.K. Srivastava , M.K. Sinha , R. Manohar Reddy , P.M. Muniswamy Reddy and B.C. Prasad
  The wild silkworm, tropical tasar Antheraea mylitta Drury being mainly culturing in central and eastern parts of India and produces famous tasar silk. This insect species expresses divergent phenotypic characters in response to varying ecological and climatic conditions thus exists as ecoraces. Hence, in the present study, three ecoraces viz., Daba, Sukinda (Semi-domesticated) and Sarihan (wild) have been selected for the assessment of the variability in silk gland related traits. The parameters of the silk glands studied like comparative length, weight and silk gland to larval body mass index. Besides, some biochemical contents of the silk gland tissue were also studied in three ecoraces. The results showed significant variations at p<5% in all the parameters among the three ecoraces studied, also showed the sexual dimorphism in expression of silk gland features and economic traits. The semi-domesticated Daba ecorace showed higher performance in most of the parameters with comparatively greater in silk gland weight (22%) and in body mass index (>16%). Apart from this, wild ecorace Sarihan cocoons showed higher shell ratio (>10% over the value of other ecoraces). The study infers that, there is wide variability in the expression of phenotype with respect to silk gland related traits among the different ecoraces of tropical tasar silkworm A. mylitta. Since the silk glands are site of biosynthesis of silk proteins, these may be considered for the assessment of diversity or characterization of different ecoraces of tropical tasar silkworm.
  R. Manohar Reddy , M.K. Sinha and B.C. Prasad
  Though, India enjoys the availability and practice of mulberry, tasar (tropical/temperate), eri and muga silks, the utilization of tropical tasar seri-biodiversity, however requires appropriate breeding methods so to exploit the global demand of this vanya silk, besides reforming tribals, weaker sections and landless rural populace on economic front. Among the existing forty four ecoraces of Antheraea mylitta Drury, only Daba and Sukinda are commercially applied for cocoon production and want is in situ conservation and ex situ stabilization of additional ecoraces, particularly the Shorea robusta (sal) based, as amenable parental base for hybridization and silk production. The breeding for disease and adversity resistance, correlation among the trait(s) of commercial value as the tasar silkworm being an eco-insect reared outdoor and exploring the biotechnological tools for transgenic application appears pragmatic and worth. The management of genotype and environment interaction through multilocational breeding stations irrespective of rearing seasons applying compatible ecorace; breed or line(s) and involving the beneficiaries for their indigenous knowledge along with trained breeders is the indispensable strategy to achieve the tasar raw silk productivity and quality. The review has dealt with feasible breeding scenario of tasar silkworm in attaining the qualitative yield for the commercial sustenance of tropical tasarculture.
  R. Manohar Reddy
  Tropical tasarculture is an agro forestry activity of growing Antheraea mylitta Drury (wild silk insect) for unique vanya silk, which provides livelihood and employment to two and half lakh rural aboriginal families of the country. The outdoor tropical tasar silkworm rearing with tentative cocoon yield requires technology intervention for assured cocoon crop and sustainable returns. The critical areas of silkworm rearing from egg incubation to spinning of cocoon needs appropriate handling to convert maximum number of viable silkworm eggs to quality silk cocoons. Though, the technologies for tasar silkworm rearing are available, their adoptability and commercial feasibility among rearing groups and operational areas require fine-tuning and the field functionaries need updation on such modifications, thus to result into feasible cost-benefit proposition. The fine-tuned adoptable technologies for higher egg hatching and healthy larval population, control of diseases and larval mortality and minimizing the cocoon yield loss with pests and predators, requires wider publicity among end users, appropriate advocation of specified methodology and in-time adoption for attainable productivity, quality and economic success in tropical tasar silkworm rearing.
  R. Manohar Reddy
  Vanya silk production in Daba ecorace of Antheraea mylitta Drury (Lepidoptera: Saturniidae) often ends up with tentative yields and the present study aimed to optimize its seed (egg) and silk productivity through varied parental combine based on their commercial traits for optimal sustenance. The prospects of varied parental combinations were assessed through consecutive rearing seasons (RS1 = July/Aug, 06; RS2 = Sept/Dec, 06; RS3 = July/Aug, 07; RS4 = Sept/ Dec, 07; RS5 = July/Aug, 08) to optimize the commercial trait output. The high pupal weight female and high shell weight male combination (C4) has recorded gain in fecundity (+8.6%), shell weight (+22.2%), silk ratio (+13.9%) and silk yield (+12.1%) with minor reduction in egg hatching (-2.4%) and cocoon yield (-6.6%) over the randomly mated parental combination (control-C1), when data of five successive rearing seasons were pooled. The high shell weight parental combination (C3) has recorded higher gain in shell weight (+12.7%) and silk ratio (+9.8%), marginal progression in fecundity (+1.2%) and regression in egg hatching (-7.8%), cocoon yield (-24.1%) and silk yield (-17.8%) when compared to control. The high pupal weight parental combination (C2) has exhibited maximum gain in fecundity (+12.2%) and loss in hatching (-19.6%), cocoon yield (-35.5%), shell weight (-12.7%), silk ratio (-10.6%) and silk yields (-45.4%) in comparison to control. The parental combinations have expressed dissimilar performance in individual rearing seasons and average of five successive seasons, though they originated from same parental stock. The study suggested that same ecorace can have different parental combinations based on magnitude of commercial traits with associated crop rearing seasons and these can be utilized for evolving breeds of commercial worth with higher fecundity and shell weight to supplement the commercially important vanya silk yield.
  R. Manohar Reddy and G. Venkateswara Prasad
  The conventional approach make the insect based natural fibre, silk to create only textiles but, an insight on production pace, eco-friendliness and bio-compatibility have widen its potential for nutritional, cosmetic, pharmaceutical, bio-medical and bio-engineering functions. The promotion of silkworm as bio-factory to synthesize important bio-material (silk protein) useful for innovative and advanced functional biological applications is a big trend in modern applied research. The worth as protein-rich diet for cardiac and diabetic patients and potential ingredient for cosmetic preparations designates the nutritional and aesthetic value of silk protein. The anti-inflammatory, anti-tumefacient, anti-coagulant and bio-stability competence made silk protein a pharmaceutical, while the property of bio-resorbability serve the function of drug delivery. The bio-attuned capacity made silk fibre as an apt bio-engineering base for tissue wall and membrane repairs; muscle ligament, blood vessel and nerve gadget restoration; and tooth, cartilage and bone reconstruction. The sericin and fibroin proteins of silk are promising wound healing agents, anti-oxidant and bio-adhesive mediators, scaffolds and implants for tissue-supporting prosthetics of human body. The vital need of contemporary sericulture industry is to explore, realize and attain the comprehensive utility avenues of the silk protein to provide biological substitutes, biochemical and physical regulatory aspects for lost or damaged human functions, which simultaneously up-keep the prosperity of silk stake-holders.
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