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Item Screening of black pepper (Piper nigrum L.) calliclones for phytophthora foot rot resistance / tolerance(Kerala Agricultural University, 1996) Shylaja, M R; Sreekandan Nair, G; James MathewCalliclones of different black pepper cultivars viz., Kalluvally, Cheriakanyakkadan, Balankotta, Karimunda and Panniyur-1 were regenerated from calli, screened against toxic metabolite(s) of Phytophthora capsici. The regenerants derived from screened and unscreened calli were further tested for resistance / tolerance to P. capsici using different methods of screening viz., natural screening (keeping in infected field), screening by electrolyte leakage method and screening by artificial inoculation with culture disc of P. capsici. None of the regenerated calliclones was found to be completely resistant to the disease in natural screening. However, some of the regenerants derived from unscreened calli exhibited higher degree of tolerance to the disease revealing the possibility of exploiting somaclonal variation for Phytophthora foot rot disease screening in black pepper. The calliclones of Cheriakanyakkadan recorded greater degree of tolerance to the disease as compared to others.Item Effect of toxic metabolite(s) of phytophthora capsici on various stages of morphogenesis of black pepper calli(Kerala Agricultural University, 1997) Shylaja, M R; Sreekandan Nair, GThe effect of toxic metaholite(s) of Phytophthora capsici on various stages of morphogenesis of black pepper calli was studied. The survival rate of the call! in toxin medium was influenced by the varieties / cultivars used for the study. Once the calli survived in the toxin medium, the toxic tnetabolite(s) did not inhibit further growth of the calli. The shoot proliferation and elongation were also not influenced by the metabolite(s) in the media. However, the root growth was affected adversely.