Browsing by Author "Ramachander, P.R."
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Item Impact of seednut selection on heritability, genotypic and phenotypic correlations in arecanut(1985) Bhagavan, S.; Bavappa, K.V.A.; Ramachander, P.R.; Nair, B.P.; Ratnambal, M.J.The heritability studies on the six morphological characters and two yield characters in arecanut were carried out for the data derived from unselected nuts from selected mother palms and selected nuts from selected mother palms in order to see the impact of seednut selection. The yield characters recorded a very low heritability. However, the selection of seednuts increased the heritability from .05 to 0.25 in the case of number of nuts and 0.08 to 0.29 in the case of weight of nuts. The other morphological characters exception height and Bomber of leaves showed increased heritability due to seednut selection. The impact of seed nut selection on yield was further established by the high genotypic and phenotypic correlations for the yield characters with seed weight, seedling girth and age at 1st flowering thereby highlighting the importance of seednut selection.Item Improvement of Arecanut Palm Areca catechu L.(1967) Bavappa, K.V.A.; Ramachander, P.R.Item Improvement of arecanut palm Areca catechu L.(1967-03) Bavappa, K.V.A.; Ramachander, P.R.Floral biology studies, progeny tests and correlation and heritability studies were undertaken .in arecanut. Floral biology studies have confirmed that arecanut palm is normally cross pollinated. Mother palms of uniform standards were found to have differential transmitting ability in regard to yield. High transmitters were found to be distributed randomly in different plantations. No relationship was found to exist between the regular yielding habit of mother palms and progeny performance. The heritability for yield was found to be comparatively low. Positive phenotypic and genotypic correlations were found to exist between number of leaves of seedlings at the time of planting, girth at collar one year after planting and number of nodes two years after planting, with yield during the first four years of bearing. The limitations of the present method of selection and techniques that could be adopted for the improvement of the crop are discussed.Item It’s Worthwhile Selecting Areca Seedlings With Care(1967-05) Bavappa, K.V.A.; Ramachander, P.R.Item Mass Pedigree Selection in Arecanut (Arecacatechu L). A Case History on the Application of the Method in a Perennial Tree Crop(2007-02) Ravindran, P.N.; Bavappa, K.V.A.; Pillai, R.S.N.; Ramachander, P.R.; Nair, M.K.; Nair, B.P.; Vijayakumar, K.This paper deals with the results of a mass pedigree selection experiment carried out in the South Kanara cultivar of arecanut. The data collected from the experiment has been utilised for various genetical studies, such as correlated responses, genotypic and phenotypic correlations, path coefficient analysis, heritability, and genetic gain achieved through selection. The results of these analysis are presented and discussed.Item Selection Index In Arecanut(1972) Ramachander, P.R.; Bavappa, K.V.A.Selection indices, genetic advance expected by selection based on them as . well as relative improvement over straight selection using 17 growth characters and 12 yield components taken as a single group and combination of certain of them in seven other groups were worked out. As against an expected genetic advance of 57-11 due to straight selection, the advance was 284*694 due to a selection index based on all the characters, a relative improvement of 498%. A simpler index using the number of leaves and height of the plant alone at the time of transplanting gave a relative improvement of 332%.Item Some Immediate Problems, Possibilities and Experimental Approaches-Arecanut(1968) Bavappa, K.V.A.; Ramachander, P.R.Experimental approaches followed in arecanut and the modifications that can be effected in these methods have been outlined. Selection of planting material and mother plants based on characters correlated with yield and on selection index, exploitation of prepotency, selection through a Modified Mass-pedigree system and exploitation of hybrid vigour using analysis of dispersion have been suggested for achieving genetic gain in yield. The need for evaluating the techniques and taking up related basic genetic studies has been pointed out.