Browsing by Author "Niral, V."
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Item Allozyme variation in populations of dwarf coconut cultivars(2004) Geethalakshmi, P.; Niral, V.; Parthasarathy, V.A.Six dwarf coconut cultivars viz., COD, MYD, CGD, MOD, GDD and GBGD were studied for isozyme polymorphism using seven enzyme systems - EST, PER, PPO, MDH, ACP, ADH and GOT. Among the cultivars, higher enzyme polymorphism was observed in GDD and least in GBGD. Of the seven isozyme systems, PPO showed higher polymorphism followed by EST, GOT, PER and MDH. ACP and ADH did not show any intrapopulation variation.Item Analysis of coconut cultivars and hybrids using isozyme polymorphism(ACTA BOT CROAT, 2004) Parthasarathy, V.A.; Geethalakshmi, P.; Niral, V.Item Analysis of genetic diversity among Indian Ocean coconut accessions through microsatellite markers(2016-03) Devakumar, K.; Neema Babu; Uma Maheswari, T.S.; Naganeeswaran, S.; Niral, V.; Augustine Jerard, B.Item Biodiversity in coconut for rich dividends(2010) George V. Thomas; Niral, V.Item Biometric clustering of coconut populations of three Indian Ocean Islands(2007-02-08) Kumaran, P.M.; Koshy, P.K.; Arunachalam, V.; Niral, V.; Parthasarathy, V.A.Coconut populations of Indian Ocean Islands of Madagascar, Mauritius and Seychelles were clustered using principal component analysis. A total of 28 vegetative, reproductive and fruit characters were used for analysis. Floral, foliar and fruit characteristics analysis indicated the usefulness of 11 characters for clustering. Five clusters were obtained on the basis of these characters. Nut characters were also found to be good for cluster analysis. All the dwarfs were in one cluster when vegetative and nut characters were considered. While selected, characters of two tails, Comoros Tall and Coco Bleu Tall were also included along with dwarfs indicating die doubtfulness of the genetic nature of these materials. These may be in fact dwarfs erroneously recorded as tails. Cluster analysis did not show any geographical affinity within the region.Item Botany, Growth and Development(2017) Niral, V.; Jerard, B.A.Item Botany, Origin and Genetic Resources of Coconut(2018) Niral, V.; Jerard, A.Item Breeding(2017) Jerard, B.A.; Niral, V.; Chowdappa, P.Item Characterization of coconut germplasm based on protein polymorphism(2005-06) Geethalakshmi, P.; Niral, V.; Parthasarathy, V.A.Item Cocoa(2011) Niral, V.; Rajesh, M.K.; Parthasarathy, V.A.Item Coconut(2011) Rajesh, M.K.; Niral, V.; Anitha Karun; Parthasarathy, V.A.Item Coconut(Today & Tomorrow's Printers and Publishers, New Delhi -110002, India, 2017) Niral, V.; Rajesh, M.K.; Parthasarathy, V.A.Item Coconut (Cocos nucifera L.) Pollen Cryopreservation(2014) Anitha Karun; Sajini, K.K.; Niral, V.; Amarnath, C.H.; Remya, P.; Rajesh, M.K.; Samsudeen, K.; Jerard, B.A.; Florent EngelmannBACKGROUND: Coconut genetic resources are threatened by pests and pathogens, naturalhazards and human activities. Cryopreservation is the only method allowing the safe and costeffectivelong-term conservation of recalcitrant seed species such as coconut. OBJECTIVE: The objective of this work was to test the effect of cryopreservation and of cryostorage duration on coconut pollen germination and fertility. MATERIALS AND METHODS: Pollen of two coconut varieties (West Coast Tall WCT and Chowghat Orange Dwarf COD ) was collected in March-May over three successive years, desiccated to 7.5% moisture content (FW) and cryopreserved by direct immersion in liquid nitrogen. RESULTS: Germination and pollen tube length (PTL) of desiccated and cryopreserved pollen were not significantly different for both WCT and COD over the three harvest months of the three consecutive years of study. Pollen germination ranged from 24 to 32% in desiccated pollen whereas it was between 26 and 29% in cryopreserved COD pollen. In the case of WCT, germination ranged from 30 to 31% in desiccated pollen, while it was between 28 and 32% in cryopreserved pollen. PTL of cryopreserved pollen ranged between 224-390 m and 226-396 m for COD and WCT, respectively. Germination of COD pollen varied between 29.0 and 44.1% after 4 years and 1.0/1.5 years cryostorage, respectively. Germination of WCT pollen did not change significantly between 0 and 6 years cryostorage, being comprised between 32 (24 h) and 40 % (1.5 years). Germination and vigour of cryopreserved pollen were generally higher compared to that of pollen dried in oven and non-cryopreserved. Normal seed set was observed in COD and WCT palms using pollen cryostored for 6 months and 4 years. Cryopreserved pollen of five Tall and five Dwarf accessions displayed 24-31% and 25-49% germination, respectively. CONCLUSION: These results show that it is now possible to establish pollen cryobanks to contribute to coconut germplasm long-term conservation.Item Coconut breeding in India - Status and future prospects(Coconut Development Board, 2006-05) Niral, V.; Samsudeen, K.; Kumaran, P.M.Item Coconut cabbage An underexploited value added coconut product(2022-07) Shameena Beegum; Niral, V.; Thamban, C.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 Research at CPCRI-Programmes,Achievements and Perspectives(2012) George V. Thomas; Niral, V.Item Coconut varieties for more return(2017) Niral, V.; Augustine Jerard, B.; Chowdappa, P.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.