Browsing by Author "Ratnambal, M.J."
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Item Biometric analysis of diversity in Pacific Ocean coconut populations(Cord, 2002) Ratnambal, M.J.; Arunachalam, V.; Augustine Jerard, B.; Sarankumar Rizwal; Damodaran, V.Item Coconut cultivars and hybrids(2007-02-08) Ratnambal, M.J.Item Coconut cultivars and hybrids(CPCRI, 2001-07) Ratnambal, M.J.Item Coconut descriptors Part-1(2007-02-08) Ratnambal, M.J.; Nair, M.K.; Muralidharan, K.; Kumaran, P.M.; Rao, E.V.V.B.; Pillai, R.V.Item Coconut genetic resources - Genetic and molecular approaches(2007-02-08) Ratnambal, M.J.; Khumaran, P.M.; Arunachalam, V.; Niral, V.; Anuradha Upadhyay; Parthasarathy, V.A.Item Coconut varietal improvement - A reflection of 50 Years of research(2007-02-08) Parthasarathy, V.A.; Ratnambal, M.J.; Kumaran, P.M.Item Coconut variety Kalpa Dhenu(2009) Niral, V.; Augustine Jerard, B.; Samsudeen, K.; Arunachalam, V.; Kumaran, P.M.; Ratnambal, M.J.; Rao, E.V.V.B.; Filial, R.V.; Satyabalan, K.; Nampoothiri, K.U.K.; Nair, M.K.; Bavappa, K.V.A.; Nair, R.V.; George V. Thomas; Kumar, M.; Meenakshi Ganesan, N.; Arulraj, S.Item Coconut variety Kalpa Mitra(2009) Niral, V.; Augustine Jerard, B.; Samsudeen, K.; Arunachalam, V.; Kumaran, P.M.; Ratnambal, M.J.; Rao, E.V.V.B.; Filial, R.V.; Satyabalan, K.; Nampoothiri, K.U.K.; Nair, M.K.; Bavappa, K.V.A.; Nair, R.V.; George V. Thomas; Bandopadhyay, A.; Ghosh, D.K.; Hore, J.K.; Sarangi, A.; Mitra, S.K.; Chattopadhyay, P.K.; Maity, S.C.; Arulraj, S.Item Coconut variety Kalpa Pratibha(2009-05) Niral, V.; Augustine Jerard, B.; Samsudeen, K.; Arunachalam, V.; Kumaran, P.M.; Ratnambal, M.J.; Rao, E.V.V.B.; Pillai, R.V.; Satyabalan, K.; Nampoothiri, K.U.K.; Nair, M.K.; Bavappa, K.V.A.; Nair, R.V.; George V. Thomas; Reddy, V.S.K.; Goutham, B.; Kalpana, M.; Raghava Rao, D.V.; Nageswarao, M.B.; Srinivasulu, B.; Vaithilingam, R.; Natarajan, C.; Kumar, M.; Meenakshi Ganesan, N.; Nagwekar, D.D.; Arulraj, S.;Item Item Colchicine induced tetraploids in ginger (Zingiber officinale Rosc.)(2007-02-08) Ratnambal, M.J.; Nair, M.K.Item Colchicine induced tetraploids in the areca palm Areca catechu L.(2007-02-08) Nair, M.K.; Ratnambal, M.J.Tetraploids have been induced in two cultivars of Areca catechu L. by treating the sprouts with aqueous colchicine.Item Combining ability in coconut (Cocos nucifera)(2007-02-08) Nampoothiri, K.U.K.; Kumaran, P.M.; Jerard, B.A.; Ratnambal, M.J.; Rao, E.V.V.B.; Parthasarathy, V.A.Item Current status of coconut genetic resources research in India(2007-02-08) Bhaskara Rao, E.V.V.; Pillai, R.V.; Ratnambal, M.J.In India coconut germplasm collection programme dates back to 1924, when some cultivars were introduced mainly from important coconut producing countries in Southeast Asia and Pacific Islands. These introductions formed the nucleus material for the crop improvement research programmes. Subsamples generated by collecting both open-pollinated and selfed seeds were assembled at Kasaragod in the forties which at present can be considered as the main germplasm holding. In the early fifties, systematic introductions of exotic germplasm as well as indigenous collections were undertaken. The present holding of 86 exotic and 40 indigenous accessions planted at Central Plantation Crops Research Institute, Kasaragod and World Coconut Germplasm Centre, Andamans forms probably the largest collection in the world. These collections comprise 102 tails and 24 dwarfs, with two accessions classified as semi-tails and one MAW A hybrid introduced from Ivory Coast. While the introductions were limited to few seednuts in each accession, the exotic collection from South Pacific consisted of 100 seednuts each. A limited number of subsamples of germplasm accessions (distinct types) are also being maintained in Agricultural University Research Centres in different coconut growing states. Efforts were made to characterise the germplasm based on the fruit component analysis. Characterisation of indigenous tall types also enabled identification of distinct indigenous types both in respect of morphological characters and fruit components. Efforts made in evaluation indicated the possibility of identifying the elite types by correlating the initial years yield with the stabilised yield.Item Cytogenetics and crop improvement of ginger and turmeric(2007-02-08) Nair, M.K.; Nambiar, M.C.; Ratnambal, M.J.Item Diversity of coconut accessions for fruit components(2005) Ratnambal, M.J.; Muralidharan, K.; Krishnan, M.; Amarnath, C.H.Using Mahalanobis generalized distance, 70 accessions of field conserved coconut germplasm maintained at Central Plantation Crops Research Institute, Kasaragod were classified for fruit characteristics. In the dendrogram showing hierarchical clustering, 4 the largest group consisted of 47 accessions. Amalgamation of clusters in this group was at shorter distance. Classification of the accessions into distinct groups was also attempted. The pattern of amalgamation observed in the dendrogram was taken as the guideline for deciding the cut-off points in the partition method which resulted in twenty seven clusters. The cluster size varied between 1 to 7: there were two clusters each of sizes 7 and 5; five clusters of size 4; eight clusters of size 2 and the remaining 12 were singletons. It was noticed that the popular cultivars known across the world (West ~ o a s Tta ll, Tiptur Tall (both from India), West African Tall, Philippines Ordinary Tall and Sri Lanka Tall) have many fruit characters in common. In other words, in most of the coconut growing countries, the cultivators considered the fruit type of these cultivars as the ideal. The three dwarfs of Malaysian origin appeared in the same cluster. However, the dwarfs did not exclusively form a cluster, except for the one consisting of Surinam Brown Dwarf and Chowghat Green Dwarf. The accessions that are distinct apart are all of Tall type. The accessions from the Pacific Ocean and South-East Asian regions were spread throughout the dendrogram, confirming bat these regions offered maximum variability. The indigenous collections also exhibited enormous variability. The correlation among the fruit characters was attributed to three causative factors, the first one related to weight measurements, second is for nut-constituents and third for the husk. The important characters that cause divergence as obtained from the canonical analysis were, weight of fruit, length of fruit, volume of cavity, weight of shell and per cent husk to fruit weight.Item Evaluation of coconut cultivars and hybrids for dry matter production(2007-02) Kasturi Bai, K.V.; Rajagopal, V.; Prabha, C.D.; Ratnambal, M.J.; George, M.V.Coconut cultivars/hybrids comprising three tails, one dwarf and five hybrids were evaluated for dry matter (DM) production and yield. The tails excelled in the vegetative dry matter production (VDM) characteristics, whereas the hybrids were superior in the reproductive dry matter production (RDM) and nut yield. Among the hybrids, West Coast Tall (WCT) x Chowghat Orange Dwarf (COD), Laccadive Ordinary (LO) x Gangabondam (GB) and LO x COD performed better than the other two (WCT x WCT and COD x WCT). Copra out-turn was related significantly to RDM as well as total dry matter (TDM) production. Attempt was made to understand the harvest index (HI) in coconut. Traits for higher DM production also were evaluated by correlation studies which indicated the higher dependence of HI on RDM rather than on VDM. Water use efficiency (WUE) also contributed significantly to higher DM production.Item Evaluation of coconut germplasm for fruit component traits and oil yield(2009) Niral, V.; Nair, R.V.; Augustine Jerard, B.; Samsudeen, K.; Ratnambal, M.J.Item Evaluation of coconut hybrids in rainfed conditions(2006) Kumaran, P.M.; Arunachalam, V.; Nampoothiri, K.U.K.; Pillai, R.V.; Ratnambal, M.J.; Niral, V.; Nampoothiri, C.G.N.