Accepted : December, 2009 Nutritional quality of leaves play vital role in the robust growth of silkworm larvae and improving the commercial characters of cocoon as well as in their reproductive performance (Li and Sano, 1987). All the nutrients in balanced proportion are necessary for the healthy growth of silkworm larvae and production of robust cocoons. Diseases play an important role in reducing the nutritional quality of leaf. Diseases interfere with plant biochemical processes occurring in the leaves and in one or more ways with the physiological functions of the plant resulting in severe loss in yield and quality (Philip, 1991). Several reports are available on the post infectional physiological and biochemical changes in various plants in response to the attack of various diseases (Philip et al., 2009). No such reports are available on the tapioca leaves infected by cassava mosaic virus.

Cassava mosaic virus induced physio-biochemical changes in the leaves of tapioca (Manihot utilissima Pohl.).

Outbreaks of root rot disease in the productive South Indian sericulture belt have threatened the sustainability of the industry. Macrophomina phaseolina (Tassi) Goid. causing charcoal rot is the predominant pathogen to which all productive mulberry cultivars are susceptible. The present study was undertaken to identify molecular markers associated with charcoal rot resistance in mulberry. A mapping panel comprising 214 diverse entries from the Indian germplasm collection was assessed for charcoal rot resistance by artificial inoculation. Resistance to the pathogen was observed in 20 entries, and 51 were found to be moderately resistant. A total of 773 alleles generated across 105 SSR loci and 20,384 AFLP markers generated using 32 EcoRI-NN and MseI-CNN primer combinations were used in genetic analysis. The panel was weakly structured with two subpopulations. However, most entries were found to be admixtures. Survival of cuttings and number of roots per sapling were associated with root rot resistance. Association mapping was performed using different linear mixed models. Five AFLP markers explaining 9.6-12.7% of the total phenotypic variance were found to be significantly (p < 0.05) associated with root rot resistance. Significant associations were also detected in four AFLP markers for survival of cuttings, and these markers explained 10.7-14.2% of the total phenotypic variance. These markers should be validated using mapping populations derived from contrasting biparental combinations by linkage analysis for use in marker-assisted gene pyramiding for durable resistance. The resistant genotypes identified in this study will substantially contribute to genetic improvement of mulberry for charcoal rot resistance and can be integrated into conventional breeding programmes.

/pdf/association-mapping-of-quantitative-resistance-to-charcoal-5ndecoq7yp.pdf

Association mapping of quantitative resistance to charcoal root rot in mulberry germplasm.

Post infectional physio-biochemical changes in food plants of silkworm and the effect of feeding diseased leaves on silkworm.

Effect of feeding 'CMV' infected tapioca leaves on the cocoon and grainage parameters of eri silkworm, Samia cynthia ricini Boisduval.

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Post infectional physio-biochemical changes in food plants of silkworm and the effect of feeding diseased leaves on silkworm.

Effect of feeding 'CMV' infected tapioca leaves on the cocoon and grainage parameters of eri silkworm, Samia cynthia ricini Boisduval.