Browsing by Author "Thankamma Pillai, P.K."
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Item Cytological behaviour of first inbred generation of coconut(2007-02-08) Nambiar, M.C.; Thankamma Pillai, P.K.; Vijayakumar, G.Cytological consequences of inbreeding in a few geographically distinct exotic varieties of coconut palms available at Central Coconut Research Station, Kasaragod, were studied Inbred and open-pollinated progenies of Laccadive, Andaman, Philippine, New Guinea and Cochin China varieties and green, -yellow and orange types of dwarf variety of indigenous and Malayan origin -were screened for their meiotic behaviour. Meiosis was comparatively more regular in both inbred and open-pollinated progenies of Laccadive variety. Inbred progenies of Philippines and Andaman varieties and both inbred and open pollinated progenies of Cochin China and New Guinea show com paratively higher frequency of chromosome aberrations and higher percentage of pollen sterility. It is suggested that inbreeding depression observed inPhilippine, Andaman and Cochin China varieties and lack of inbreeding depression in Laccadive varieties is either due to the difference in the intensity of inbreeding and selection between these geographically distinct varieties or to the Laccadive genotypes being comparatively less sensitive to inbreeding.Item Cytological investigations in different varieties of Cocosa Nucifera and related species(Central Plantation Crops Research Institute Kasaragod - 671 124,Kerala, 1979) Thankamma Pillai, P.K.; Mohammed Syed, A.A.; Vellaichamy, K.; Zubaida, P.M.Item Cytology of an abnormal coconut palm(2007-02-08) Thankamma Pillai, P.K.; Vijayakumar, G.Studies on the course of microscoporogenesis in the progeny of a self-polljinated New Guinea palm revealed highly aberrant meiosis. The sterility in this palm has been attributed to inbreeding.Item Cytology of coconut(2007-02-08) Thankamma Pillai, P.K.; Vijayakumar, G.; Ravindran, P.N.The chromosome number in coconut is 2n=32. Karyomorphological studies show light differences between Tall and Dwarf varieties. Meiosis was generally regular ,n Tall cultivars and in hybrids between Tall and Dwarf, while several irregularities have been reported in the Dwarf and semi-tall cultivars. Pollen fertility is very high in Tails and hybrids as compared to that in Dwarfs and semi-tails. Meiotic irregularities are commonly met within the spicata palms and these are believed to have originated from Tails. Free nuclear division has been reported in coconut milk. C-mitosis leading to high ploidy level and several chromosome abnormalities occur in developing endosperm. In Philippines makapuno nuts, the endosperm development is very abnormal. An inverse relationship between ploidy level and oil content has been also observed by some authors. The two existing views on the origin of Dwarfs from Tails, namely, mutant origin or by continuous inbreeding, are presented. Another possibility that both Tails and Dwarfs might have had a common origin in a single ancestral form has been proposed.Item Electrophoretic Patterns of Soluble Leaf Proteins of Curcuma(2007) Nambiar, M.C.; Thankamma Pillai, P.K.Item Electrophoretic patterns of soluble leaf proteins of Curcuma(2007-02-08) Nambiar, M.C.; Thankamma Pillai, P.K.Item Flowering behaviour, cytology, and pollen germination in ginger (Zingiber officinale Rosc.)(2007-02) Thankamma Pillai, P.K.; Vijayakumar, G.; Nambiar, M.C.The flowers of Zingiber officinale are trimerous, with an attractive labellum, a single fertile stamen, and an inferior ovary with many ovules on an axile placentum. The ovule is -anatropus and bitegmic. Meiosis was highly irregular. Only 37 % of the pollen grains was stainable in aceto-carmine. Maximum germination observed in an artificial medium was only 14.5 %.Item Note on the shedding of immature fruits in cashew(2007-02) Thankamma Pillai, P.K.; Pillai, G.B.Item Note on the shedding of immature fruits in cashew(1975) Thankamma Pillai, P.K.; Pillai, G.B.Item Seedling Propagation In Turmeric (Curcuma Aromatica Salisb)(1982) Nambiar, M.C.; Thankamma Pillai, P.K.; Sarma, Y.N.Flowering behaviour, seed set, germination of seeds, growth and behaviour of seedlings and rhizome yield of seedlings were studied in C. aromatica. Fruit set was not observed in C. longa. Seedling progenies of 58 lines of C. aromatica showed remarkable uniformity in morphological characters as well as in chromosome numbers.Item Study of Microsporogenesis in Cashew(1984) Thankamma Pillai, P.K.; Nambiar, M.C.