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CORD
Published by International Coconut Community
ISSN : 02151162     EISSN : 27218856     DOI : 10.37833/cord
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Library & Information Science
Aims CORD aims to publish original research results and reviews on research and development. While encouraging those involved in research and developments to disseminate their finding it also assists policy makers and planners to be aware of the latest developments in the sector Scope CORD encompasses a broad range of research topics in animal sciences: seedlings and genetics, farming, harvesting, production, health, biotechnology, and production, socio-economic, and policy.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 5 Documents
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Search results for , issue "Vol 32 No 2 (2016): CORD" : 5 Documents clear
Comparative Evaluation of Sri Lanka Tall and Dwarf x Tall Coconut Hybrids for Tolerance to Weligama Coconut Leaf Wilt Disease in Sri Lanka Perera, S. A. C. N.; Waidyarathne, K. P.; Dissanayaka, H. D. M. A. C.; Nainanayake, N. P. A. D.; Ekanayake, G. K.
International Coconut Community Journal Vol 32 No 2 (2016): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (405.394 KB) | DOI: 10.37833/cord.v32i2.30

Abstract

Weligama Coconut Leaf Wilt Disease (WCLWD) is a phytoplasma disease found in Southern Sri Lanka. It is an incurable, debilitating disease resulting in yield loss and ultimate death of the palm and over 250,000 palms have been identified to be infected. Breeding coconuts for resistance is a viable option in managing incurable diseases and for this WCLWD resistant germplasm is needed. Accordingly, the objective of the current research was to investigate the comparable levels of WCLWD resistance of Sri Lanka tall and CRIC65 coconut cultivars which are favoured in Sri Lanka. Eight coconut estates which were planted with Sri Lanka tall (SLT) and CRIC65 hybrids as a mixed plantation or in close proximity were observed. Out of them an extent of about 04 acres of one estate was selected for detailed analysis using the disease severity index developed based on the WCLWD symptoms; flaccidity, leaf yellowing and marginal necrosis of leaflets. General observations indicated the presence of WCLWD in both SLT and the hybrid CRIC65. Marginal necrosis was at a minimal level in both the cultivars, while the other symptoms; flaccidity and yellowing scored higher values at all levels in the spiral in SLT than in hybrid CRIC65. Moreover, the hybrid coconut CRIC65 displayed lower percentage of disease incidence and significant reduction in the levels of the main symptom flaccidity. As a result, the hybrid palms recorded significantly low disease index value than SLT. Moreover, disease incidence was observed to be low in properly managed estates irrespective of the cultivar. With the findings of the current study, coconut varieties SLGD and selected SLT which remain healthy under the same disease pressure can be recommended as parents in a breeding programme aiming at resistance/tolerance to WCLWD.
Identification of Training Needs of the Coconut Growers in Sri Lanka Herath, Chaminda S.
International Coconut Community Journal Vol 32 No 2 (2016): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (673.74 KB) | DOI: 10.37833/cord.v32i2.31

Abstract

The coconut farming sector in Sri Lanka has been facing many problems which eventually led to a decrease in production and profitability in coconut farming. The main reason for the decrease in production has been the non adoption of scientific technologies primarily due to the lack of technical knowledge of coconut growers on scientific cultivation practices. Hence, a study was undertaken to assess the technical knowledge and the level of adoption of management practices with a view to identify and prioritize the training needs of coconut growers’. Training needs of the growers were assessed using the Borich Needs Assessment Model. The identified training needs were filtered by quadrant analysis. The discrepancy score of grower’s and the coconut development officers’ of the three districts were used as the dimensions of the quadrant analysis. The training needs were identified under four categories namely, planting practices, fertilizer application practices, agronomy practices and pest management practices. The study revealed that the most knowledgeable aspect was the planting practices and the least knowledgeable was the pest management practices, as evidenced by higher level of adoption of planting practices and the least adoption of pest management practices. It was concluded from the study that the most desirable training need was on the pest management practices followed by fertilizer application practices in the coconut triangle of Sri Lanka.
Coconut Micropropagation in Mexico using Plumule and Floral Explants Oropeza, Carlos; Sáenz, Luis; Chan, José Luis; Sandoval, Gabriela; Pérez-Núñez, Teresa; Narvaez, Maria; Rodríguez, Guillermo; Borroto, Carlos
International Coconut Community Journal Vol 32 No 2 (2016): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (906.359 KB) | DOI: 10.37833/cord.v32i2.32

Abstract

This paper focuses on the research efforts carried out by CICY in Mexico on micropropagation of coconut. They started during the nineties in collaboration with Wye College (UK) and ORSTOM-CIRAD (France), with the development of a protocol that was reproducible and more efficient than previous ones, based on plumule explants grown in different media based on Y3 medium added with activated charcoal, gelling agent and of particular importance growth regulators 2,4-dichlorophenoxyacetic acid (2,4-D) and 6-benzylaminopurine (BAP). Within the next decade basic research was carried out to study the process of somatic embryogenesis from plumule explants, with an approach including morpho-histological, physiological, biochemical and molecular points of view, in order to gain knowledge that could be useful to further improvement of the process. Also different practical approaches were tested including changes in the media formulation, embryogenic callus multiplication and secondary somatic embryogenesis. As a result a highly efficient protocol was developed that could potentially yield over a hundred thousand somatic embryos from a single plumule explant. Embryos were able to germinate and convert to plantlets, that after planting, successfully grew to sexual maturity and fruit production. This protocol is currently being scaled up to a semi-commercial level. Also within the past five years, a protocol using rachilla explants has been developed for the production of embryogenic callus and its multiplication, and embryos produced were able to germinate and convert to plantlets, setting the basis to develop a process for massive propagation of coconut, such as the one already developed using plumule explants.
Improving the Availability of Valuable Coconut Germplasm using Tissue Culture Techniques Adkins, Steve; Nguyen, Quang Thien; Foale, Mike
International Coconut Community Journal Vol 32 No 2 (2016): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (352.96 KB) | DOI: 10.37833/cord.v32i2.33

Abstract

Coconut cultivation faces a number of acute problems that reduce its productivity and competitiveness. These problems include various biotic and abiotic challenges as well as an unstable market for its traditional oil-based products. Around 10 million small-holder farmers cultivate coconut palms worldwide on c. 12 million hectares of land, and many more people own a few coconut palms that contribute to their livelihoods. Inefficiency in the production and supply of appropriate seedlings for replanting a generally ageing resource remains an issue, especially where there is uncertainty about the ability of local populations to resist potential disease threats. However, tissue culture in such cases is expected to provide pragmatic solutions. Over the past 60 years much research has been directed towards developing and improving protocols for (i) embryo culture; (ii) clonal propagation via somatic embryogenesis and (iii) germplasm conservation via cryopreservation. Recent advances have provided new ways to improve these protocols, especially cryopreservation. Although effective embryo culture and cryopreservation are now possible, the low efficiency of conversion of somatic embryos to ex vitro seedlings still restrains the large-scale clonal propagation of coconut. Although tissue culture in coconut has developed over the recent decades, further improvement of protocols and their application to a wider range of germplasm will boost their adoption for the breeding, conservation and propagation of coconut.
Genetic Diversity Evaluation of MARDI’s Coconut (Cocos nucifera L.) Germplasm using Simple Sequence Repeats Khairun, H. N.; Jaafar, Mohd Azwan; Shahril, A. R.; Sentoor, G. K.; Siti, N.; Fairuz, M. Y.; Habibuddin, H.; Norzihan, A.
International Coconut Community Journal Vol 32 No 2 (2016): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (738.599 KB) | DOI: 10.37833/cord.v32i2.34

Abstract

A total of 18 simple sequence repeat (SSR) markers have been optimized and used to genotype coconut (Cocos nucifera L.). These markers were used to genotype 23 coconut varieties that were maintained in MARDI’s germplasm collection. Fifteen SSR loci were polymorphic markers while the remaining three SSR were monomorphic. The number of alleles ranged from 2 to 19 with a mean number of 8.53 per locus. The expected heterozygosity values in each variety ranged from 0.07 to 0.61, with an average value of 0.52. Several varieties could be successfully differentiated by using these 15 SSR markers such as Cameroon Red Dwarf x West African Tall hybrid, Mawa hybrid, Malayan Tall x Cameroon Red Dwarf hybrid, Malayan Red Dwarf x Rotuman hybrid, Catigan, Pandan and Laguna. A UPGMA Dendogram showed Niu Damu as an outlying group with high dissimilarity from all other varieties. Analyses using the STRUCTURE software showed all 23 varieties to be clustered into 21 genotypic groups. This new information will greatly contribute towards characterization of the MARDI’s coconut germplasm collection and to develop a SSR tool for the identification of new coconut varieties in Malaysia.

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