Browsing by Author "Sankaran, M."
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Item Characterization and diversity assessment in coconut collections of Pacific Ocean Islands and Nicobar Islands(2012-12) Sankaran, M.; Damodaran, V.; Singh, D.R.; Jai Sankar, I.; Jerard, B.A.Characterization and genetic diversity assessment among 30 conserved coconut accessions collected from Pacific Ocean Islands and Nicobar Islands for morphological traits, physico-chemical traits of tender nut water, leaf biochemical parameters and molecular characterization by using random amplified polymorphic DNA (RAPD) markers were undertaken at World Coconut Germplasm Centre, Andaman. Significant variations were observed for most morphological and nut component traits. Out of the 30 accessions characterized, four accessions, namely, Niu Leka, Hari Papua, Niu Oma and Nikkore were dwarfs among which Niu Leka was identified as a unique dwarf with higher copra content. A dendrogram of genetic relationship obtained through RAPD markers showed distinct variation with 66% in all accessions. The average polymorphic information content (PIC) value of 13 selected primers was 0.29 and maximum and minimum PIC values was 0.46 and 0.17 for primers OPF-19 and OPH-25, respectively. Cluster analysis by UPGMA method grouped the accessions into two major clusters. The results will be useful in the selection among these conserved accessions for specific traits for future utilization in crop improvement initiatives based on their performance for different desirable traits and the level of diversity.Item Conservation and utilization of soft endosperm coconut accession from Andaman Islands(2013-04) Jerard, B.A.; Damodaran, V.; Niral, V.; Samsudeen, K.; Rajesh, M.K.; Sankaran, M.The recent genetic resources explorations undertaken in Andaman Islands revealed the occurrence of coconut palms yielding soft endosperm among the natural coconut population called Thairu thengai or Nei thengai. The characterization of Thairu thengai accession from Andaman Islands using the in situ observations on seven palms revealed that the palms belong to tall group of coconut.The palms of this type bear fruits with both normal and soft endosperm.About 16 to 27 per cent of the fruits per bunch were observed to be with soft endosperm and the remaining ones were with normal firm endosperm. The normal nuts of the identified palms produced poor quality copra indicating some degree of softness. The soft endosperm fruits are of three types with difference in the layers of soft endosperm, nut water and firm endosperm. The palms are found to occur sporadically in South Andaman. Although these palms appear morphologically looking similar to other coconut palms except for endosperm trait, differences could be observed for many morphological and fruit component traits. The morphological and fruit component traits of Thairu thengai coconut are compared with the other other coconut populations. The strategies for conservation and utilization of this novel type of coconut are proposed.Item High-yielding coconut varieties(2011) Sankaran, M.; Damodaran, V.; Singh, D.R.; Srivastava, R.C.; Damodaran, T.; Jai Sankar, I.; Augustine Jerard, B.Item IND 099 – Niu Leka Green Dwarf (EC0415218; INGR13065), a Coconut (Cocos nucifera) Germplasm of Short Statured Palm but Possessing the Advantageous Characters of Talls(2014) Augustine Jerard, B.; Niral, V.; Dhanapal, R.; Damodaran, V.; Saran Kumar Rizal; Arunachalam, V.; Sankaran, M.; Nair, R.V.; Ratnambal, M.J.; Bhaskara Rao, E.V.V.; Koshy, P.K.; George V. ThomasItem Vivipary in Cocos nucifera L. var. Andaman Green Dwarf(2012-11) Sankaran, M.; Damodaran, V.; Singh, D.R.; Jerard, B.A.Item Vivipary in Cocos nucifera L. var. Andaman Green Dwarf(2012-11-25) Sankaran, M.; Damodaran, V.; Singh, D.R.; Jerard, B.A.