Genetic variation among species, races, forms and inbred lines of lac insects belonging to the genus Kerria (Homoptera, Tachardiidae)

The lac insects (Homoptera: Tachardiidae), belonging to the genus Kerria, are commercially exploited for the production of lac. Kerria lacca is the most commonly used species in India. RAPD markers were used for assessing genetic variation in forty-eight lines of Kerria, especially among geographic races, infrasubspecific forms, cultivated lines, inbred lines, etc., of K. lacca. In the 48 lines studied, the 26 RAPD primers generated 173 loci, showing 97.7 percent polymorphism. By using neighbor-joining, the dendrogram generated from the similarity matrix resolved the lines into basically two clusters and outgroups. The major cluster, comprising 32 lines, included mainly cultivated lines of the rangeeni form, geographic races and inbred lines of K. lacca. The second cluster consisted of eight lines of K. lacca, seven of the kusmi form and one of the rangeeni from the southern state of Karnataka. The remaining eight lines formed a series of outgroups, this including a group of three yellow mutant lines of K. lacca and other species of the Kerria studied, among others. Color mutants always showed distinctive banding patterns compared to their wild-type counterparts from the same population. This study also adds support to the current status of kusmi and rangeeni, as infraspecific forms of K. lacca.

HIV & psychiatric disorders.

HIV infection and psychiatric disorders have a complex relationship. Being HIV infected could result in psychiatric disorders as a psychological consequence of the infection or because of the effect of the HIV virus on the brain. Disorders may be as varied as depression, post-traumatic stress disorders, AIDS phobias, grief and the whole gamut of cognitive disorders. In addition, several psychiatric conditions may predispose individuals to acquiring HIV infection as a consequence of their influence on behaviour. There is also strong evidence of the relationship of substance use disorders and severe mental illnesses with HIV infection. HIV related psychiatric disorders also offer a challenge to clinicians in issues of differential diagnosis and management. Majority of the work in India has focused on substance use and HIV, and to a lesser extent on the psychiatric effects of HIV infection. Given the magnitude of the problem in the country and the multiple physical and psychological stressors that persons with HIV face in India, more research is needed.