Browsing by Author "Jayabose, C."

Now showing 1 - 8 of 8
  • Thumbnail Image
    Item
    Characterization of a spicata mutant of coconut palm in India
    (Indian Society for Plantation Crops, 2014-04) Arunachalam, V.; Rajesh, M.K.; Jerard, B.A.; Jayabose, C.; Sairam, C.V.
  • Thumbnail Image
    Item
  • Thumbnail Image
    Item
    Development of a Dwarf x Tall coconut hybrid 'Kalpa samrudhi'
    (2015-04) Augustine Jerard, B.; Niral, V.; Samsudeen, K.; Nair, R.V.; Jayabose, C.
    An evaluation trial conducted over 28 years on coconut hybrid combinations has resulted in identification of a superior, high yielding Dwarf x Tall hybrid, named as ‘Kalpa Samrudhi’ involving IND 058S as female parent and IND 069S as male parent. The results revealed that the hybrid is better performing over other hybrids and local control with higher fruit yield (117 fruits palm-1 year-1), high copra out turn (25.72 kg palm-1 year-1 or 4.5 t ha-1 year-1 copra) and estimated oil recovery of 3.04 tonnes ha-1 under rainfed conditions of Kerala. The palms of the hybrid are semi tall, take an average of 45 months for initiation of flowering under rainfed conditions, possess good tender nut water quality (TSS 6o Brix) and higher quantity (346 mL per tender nut). The tender nut water has Na content of 35.1 ppm and K content of 2370 ppm. The hybrid recorded 30.27 per cent more nut yield, 66.05 per cent more copra yield and 73.71 per cent more oil yield over another released Dwarf x Tall hybrid ‘Chandra Sankara’. The seedlings of the hybrid are more vigorous, producing higher number of leaves within 12 months, having higher leaf area and dry weight indicating precocity in growth and development. The flowering, morphological and fruit component traits of the hybrid were compared with parental palms. The characteristics of this hybrid and its performance indicate potential to increase the production and productivity of coconut.
  • Thumbnail Image
    Item
    Digital phenotyping of coconut and morphological traits associated with eriophyid mite (Aceria guerroronis Keifer) infestation
    (2013-12) Arunachalam, V.; Augustine Jerard, B.; Elain Apshara, S.; Jayabose, C.; Subaharan, K.; Ravikumar, N.; Palaniswami, C.
    Observations were recorded on traits associated with mite infestation related at two stages of button on six different coconut cultivars over three years. Highly significant correlation was found between mite damage score with color or weight of tepal. Step-wise multiple regression of the data analysis showed color of inner tepal as major trait associated with infestation by eriophyid mite. Other traits are ratio of tepal weight to tepal area, per cent of buttons with pink discoloration or with resin, tepals of regular aestivation and gap between fruit and tepal. Digital phenotype data of 83 image files were used to calculate color signature and correlated the same to mite damage score over three years. Red spectral values were found to vary from 14 to 251, green values to 12 to 237 and blue to vary from 5 to 183. Spectral values red max, green max, 3* Red + Green max had high significant negative correlation (>-0.4) with mite damage. Color and firmness of fruits and tepals of three coconut varieties were further analyzed where, fruits and tepals of COD variety showed high red/green (a* value of Hunterlab) >12. Firmness of 3 month old tepal and fruit of Benualim (BGRT) tall variety was (penetrometer reading >38) higher than other varieties.
  • Thumbnail Image
    Item
    Estimation of heterosis of economical important characters of coconut (Cocos nucifera L.) hybrids
    (Indian Society for Plantation Crops, 2008) Jayabose, C.; Ganesh, S.; Mohanan, K.V.; Arulraj, S.
  • Thumbnail Image
    Item
    Evaluation of coconut hybrids for tender nut purpose
    (2007-09) Elain Apshara, S.; Arunachalam, V.; Jayabose, C.; Kumaran, P.M.
    Evaluation of coconut hybrids for their suitability as tender nut was undertaken. Physical, bio-chemical, organoleptic characters and mineral composition of tender coconuts of six released hybrids COD x WCT (Chandrasankara), LCT x COD (Chandralaksha), LCT x GBGD (Lakshaganga), WCT x COD (Kerasankara), WCT x GBGD (Keraganga), WCT x MYD (Kerasree) were studied with COD (Chowghat Orange Dwarf) as control. Fruits were harvested at three different stages of maturity. Quantity and quality of tender nut water and meat differed significantly among the hybrids and between the stages of maturity. The tender nuts of hybrids COD x WCT and LCT x COD weighed less but have more volume of water. TSS and pH were the maximum in the same hybrids. Total sugars, reducing sugars and amino acid contents were more in COD x WCT and LCT x COD. Minerals, such as potassium and sodium were at optimal levels in the same hybrids. Organoleptic evaluation showed that the hybrids Chandrasankara and Chandralaksha were the best for tender nut purpose as both of them ranked good for taste of water and meat at the age of 7 months during summer season.
  • Thumbnail Image
    Item
    Microsatellite analysis of distinct coconut accessions from Agatti and Kavaratti Islands, Lakshadweep, India
    (Elsevier, 2010) Devakumar, K.; Niral, V.; Augustine Jerard, B.; Jayabose, C.; Chandra Mohanan, R.; Jacob, P.M.
    The Lakshadweep group of islands, located in the south-western part of India in the Indian Ocean is considered unique for its coconut populations owing to its geographic isolation and assumed introgression with mainland coconut populations along west coast of mainland India. A wide range of variability was noticed for morphological characters of Lakshadweep coconut populations. A total of nine accessions were collected from Agatti and Kavaratti Islands of Lakshadweep as part of a germplasm enrichment programme for island coconut populations of India. This includes three Laccadive Micro types, four types of Laccadive Ordinary Tall differing in nut bearing habit, fruit shape and size, one each of sweet husked Kaithathali tall and dwarf type. The microsatellite analysis of the 9 coconut populations with 8 primers revealed a total of 37 alleles. The highest number of eight alleles was detected for the CAC8 primer and the lowest number of three alleles for the CAC10, CAC13 and CnCIRG11 primers. The estimate of heterozygosity was highest (>0.5) for the two Laccadive Micro Tall (LMT02 and LMT03) and the Laccadive Small Tall (LCT02) populations and was lowest (0.24) for the Laccadive Micro Tall (LMT01). The sporadic occurrence of Laccadive Micro Tall is discussed in the context of high outcrossing and inbreeding depression.
  • Thumbnail Image
    Item
    Variability and heterosis in spathe traits of coconut (Cocos nucifera L.)
    (2010-08) Jayabose, C.; Ganesh, S.; Natarajan, C.; Arunachalam, V.; Arulraj, S.