Sagarika Kannangara

Sagarika Kannangara
University of Kelaniya · department of botany

About

82
Publications
23,790
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325
Citations
Citations since 2016
69 Research Items
300 Citations
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2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100

Publications

Publications (82)
Article
A variety of anthropogenic sources release hazardous polyaromatic hydrocarbons (PAHs) into the phyllosphere which is an excellent niche for diverse fungi, and some of them have PAHs degradation capabilities. Therefore, this research attempted to determine the PAHs (phenanthrene, anthracene, naphthalene, and pyrene) degradation capability of phyllos...
Conference Paper
Full-text available
Excessive use of synthetic fertilisers is a significant drawback in modern agriculture, and it has several negative outcomes; unfavourable environmental effects and adverse impacts on human health and agriculture. The present study was conducted to produce an organic fertiliser paste from alien invasive plants enriched with either Trichoderma harzi...
Conference Paper
Full-text available
Plant diseases can cause a significant impact on agricultural productivity. One of the main causative factors for plant diseases is pathogens. Plant pathogens can be fungi, bacteria, viruses, or nematodes. Plant diseases can be prevented, mitigated, or controlled by using a variety of methods. Among these methods, bio-controlling is more effective...
Article
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Aims: Meloidogyne incognita adversely affects numerous crop plants worldwide. Therefore, the modern world has beenmoving towards biocontrol methods to prevent nematode attacks. This study was aimed to (i) investigate the potentialuse of Trichoderma harzianum NFCF160 and T. virens Isf-77 in managing M. incognita in soil and (ii) identify trappingmec...
Conference Paper
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Background Chronic kidney disease of unknown etiology (CKDu) is now the seventh leading cause of death nationally in Sri Lanka. The dietary patterns and toxicants in food consumed by affected communities can be considered one of the causatives of kidney malfunctioning. Originality / Value Quantification of dietary exposure to heavy metals shoul...
Article
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Agricultural sustainability through crop residue biodegradation is an eco-friendly method to enrich soil fertility essential to agricultural countries. Rice straw, rich in cellulose, is the primary source of organic matter, enhancing the fertility in rice fields and is a better alternative to replace chemical fertilizer usage. Therefore, this attem...
Conference Paper
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Chronic low-level exposure to nephrotoxic heavy metal contamination is among the main postulated risk factors associated with the emergence of CKDu in certain parts of Sri Lanka. Dietary habits of those Sri Lankan remote communities are distinctly different from most local and global counterparts. Therefore, the sources and magnitude of dietary exp...
Conference Paper
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Fluoride is one of the top ten chemicals of concern for human health. Chronic exposure to fluoride in excessive levels results in diseases such as dental and skeletal fluorosis, tissue calcification, and chronic kidney disease. Manifestation of the Chronic Kidney Disease of unknown etiology (CKDu) is mainly due to the prolonged exposure to environm...
Conference Paper
Full-text available
Fungi are one of the major causative agents of plant diseases. They damage plants by causing cell death or by causing plant stresses. Chemical fungicides which are commonly used to control fungal pathogens reported to cause a negative impact on human health and environment, despite their high efficiency in controlling the pathogens. Therefore, the...
Article
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Chronic Kidney Disease of Unknown etiology (CKDu) has become an alarming health issue in Sri Lanka. The disease is more notable among farming communities and people who consume groundwater as their main source of drinking water. To assess the possible links between drinking water chemistry and expansion of CKDu, the study was compared with hydro-ge...
Article
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Purpose: Environmental-friendly organic fertilizers reduce the adverse impacts of chemical fertilizers. This study was conducted to formulate organic liquid fertilizers using selected plant materials i.e., Tithonia diversifolia, Mikania scandens, Chromolaena odorata and Gliricidia sepium with selected organic wastes to compare the efficacies of fol...
Article
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Endophytic fungi are a diverse group of microorganisms that live asymptomatically in healthy tissues of host and they have been reported from all kinds of plant tissues such as leaves, stems, roots, flowers, and fruits. In this study, fungal endophytes associated with tea leaves (Camellia sinensis) were collected from Kandy, Kegalle, and Nuwara Eli...
Article
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Purpose Fish waste is a protein-rich source that can be used as a value-added product in the formulation of organic liquid fertilizers. This study carried out to investigate the utilizing potential of fruit wastes of Ananas comosus and Carica papaya that contain bromelain and papain as major proteases in order to hydrolyze fish waste proteins to fu...
Article
Full-text available
Plant pathogens cause severe losses or damage to crops worldwide and thereby significantly reduce the quality and quantity of agricultural commodities. World tendencies are shifting towards reducing the usage of chemically synthesized pesticides, while various biocontrol methods, strategies and approaches are being used in plant disease management....
Article
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Investigation of a best fitting mathematical model for the frequency of occurrence of Trichoderma harzianum in Hakgala Montane Forest in Sri Lanka.
Conference Paper
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Plant Growth Promoting Fungi (PGPF) facilitate a favorable interaction with plants in the rhizosphere through several biological processes. PGPF play a significant role in phyto-stimulation, phytoremediation and biofertilization. The use of PGPF as a biofertilizer has steadily increased in sustainable agriculture to reduce the use of chemical ferti...
Conference Paper
Full-text available
Meloidogyne incognita, the root knot nematodes are a widely spread group of plant pathogens that affect a variety of economically important plants. Even though chemical nematicides are used to control the nematodes at present, these nematicides pose a huge threat to the environment. Taking this fact into account usage of nematophagous fungi has gai...
Article
Full-text available
Background Diabetes mellitus type 2 (DMT2) is a leading metabolic disorder in the world. Anti-diabetic actions of phytochemicals from various medicinal herbs have been explored as an alternative therapy in the management of DMT2 due to adverse effects of synthetic drugs used in allopathic medicine. α-amylase and α-glucosidase inhibitory potential a...
Article
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Bioactive compounds entrapped in plant materials can be effectively recovered using fungal enzymes. Cinnamomum zeylanicum Sri Wijaya (SW) and Sri Gemunu (SG) accessions and commercially available C. zeylanicum (CC) were subjected to fungal pretreatment and extracted with pressured water (PWE, 0·098 MPa). Thirteen fungal species were isolated and th...
Conference Paper
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Nagacholai Forest Reserve, which was disturbed by local terrorism before 2009, is located in Mullaitivu District in the Northern Province of Sri Lanka. It is a tropical dry zone forest, administrated by the Department of Forest Conservation, Sri Lanka. Litter-fall and subsequent nutrient release from decomposing litter are crucial processes that re...
Article
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Considerable amounts of fish and fruit wastes are produced on a daily basis due to the fish processing and postharvest handling of fruits. The proper management of organic waste by converting into valuable resources is of utmost importance, in order to reduce their adverse impacts on the environment. This study was aimed to assess the utilizing pot...
Article
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Tithonia diversifolia, Sphagneticola trilobata, Mikania scandens, Lantana camara, Chromolaena odorata, Panicum maximum and Mimosa pigra are common weeds in Sri Lanka. This study was aimed to assess the nutrient release potential and the weight loss dynamics during leaching of the above weeds to utilize them as organic liquid fertilizers. Thirty sam...
Article
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Suitability of selected Sri Lankan weeds for the formulation of organic liquid fertilizers R. H. A. A. Ranasinghe*, L. R. Jayasekera, S. D. P. Kannangara and R. M. C. S. Ratnayake Department of Botany, Faculty of Science, University of Kelaniya, Sri Lanka *Corresponding Author: achala_rana@yahoo.com [Accepted: 25 July 2019] Abstract: Tithonia diver...
Article
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Species of Hypoxylon exhibit their highest diversity in the tropics. During an assessment of diversity of hypoxylaceous fungi in the lowland wet zone forest area in Sri Lanka, two new records were reported. Morphological identification of the collected samples was carried out using both macroscopic and microscopic characteristics. Genomic DNA was e...
Conference Paper
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Pressured water extraction (PWE) is an environmentally friendly technique that has been used to extract anti-diabetic substances than solvent extraction. In the present study, Ceylon Cinnamon(CC, Cinnamomum zeylanicum)was selected as a natural source for anti-diabetic agent. The purpose of this study was to determine the inhibitory potential of α-a...
Article
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Purpose: Stem-End Rot (SER) is one of the most frequently found mango postharvest diseases in many countries including Sri Lanka. Availability of a significantly detailed study on morphological and molecular characterization of the SER associated fungal species is comparatively low. The present study has been carried out considering the above fact....
Article
Full-text available
Organic potting medium is an important source for growing of vegetable and ornamental plants. Use of Trichoderma spp. as bio control agents as well as growth promoters in agricultural systems has been identified as an effective methodology to minimize the use of agrochemicals. Present investigation was carried out to formulate a low cost organic po...
Article
Full-text available
Trichoderma spp. are fast growing fungi, widely used as bio-controlling agents for controlling soil-borne diseases of plants. They also act as growth promoters. The current study was conducted to investigate the effect of compost enriched with three Trichoderma spp. (T. virens, T. harzianum and T. asperullum) on the growth and disease suppression i...
Article
Full-text available
Trichoderma spp. are fast growing fungi, widely used as bio-control agents for controlling soil borne diseases of plants, as well as growth promoters. The present investigation was carried out to isolate and identified fast growing Trichoderma spp. and mass production using low cost widely available solid and liquid carrier materials. Several funga...
Article
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Antifungal activity of aqueous, hot water and ethanolic leaf extracts of Croton aromaticus in controlling crown rot (CR) disease of Embul banana was investigated in vivo during the study. Embul banana hands were sprayed with C. aromaticus aqueous, hot water and ethanolic leaf extracts alone and in combination with alum and were stored in modified a...
Article
Full-text available
Trichoderma spp. are fast growing fungi, widely used as bio-control agents for controlling soil-borne diseases of plants as well as growth promoters. The current study was conducted to investigate the effect of three Trichoderma spp. (T. virens, T. harzianum and T.asperullum) inoculated compost media on growth and disease suppression of Solanum mel...
Article
Full-text available
Pressured water extraction (PWE) is an environmentally friendly technique that has been used to extract anti-diabetic substances than solvent extraction. In the present study, Ceylon Cinnamon (CC, Cinnamomum zeylanicum) was selected as a natural source for anti-diabetic agents. The-amylase-glucosidase and to compare the efficiency of the extracts w...
Conference Paper
Full-text available
Cinnamon (Cinnamomum zeylanicum) is an evergreen plant widely grown across Asia as a spice and to extract its essential oil. The composition of essential oil, obtained from different parts of the plant differ in chemical composition. Further, the extraction method would also influence the chemical composition of the essential oil. The aim of the cu...
Conference Paper
Full-text available
Trichoderma spp. are one of the major biocontrol agents which have the ability to act against large numbers of foliar and soil borne pathogens and are eco-friendly good plant growth promoting agents. Present investigation was carried out with an attempt to determine 1) the best organic carrier material in which the viability and antagonistic activi...
Article
Full-text available
Ceratocystis paradoxa is a plant pathogen causing diseases in several plants including coconut (Cocos nusifera). Infected coconut plants manifest " Stem bleeding " which is very common in Hambantota district in Sri Lanka. Coir and coir pith obtained from coconut husk provide substrates for the growth of the pathogen. The use of biological control a...
Article
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Effect of basil oil and aluminium sulphate in combination with modified atmosphere packaging was investigated in controlling crown rot and extending the shelf life of Cavendish banana at 12-14°C. Cavendish banana fruits were treated with 1% alum, 1% alum + 0.4% basil oil and distilled water (control). Treated banana samples were packed in Low Densi...
Article
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Effect of Ocimum basilicum (basil) oil spray treatment, alum in combination with modified atmosphere packaging (MAP) was investigated in extending the shelf life of Cavendish banana (Musa acuminata, AAA-Grand Naine cultivar) at 12-14 0 C. Twelve week mature Cavendish banana fruits were treated with 1% (w/v) alum (Potassium aluminium sulphate), 1% (...
Article
Full-text available
Synthetic fungicides are widely used in controlling postharvest diseases of fruits worldwide. The interest of finding natural bioactive components has increased due to the harmful effects of synthetic fungicides on environment and health. Present study was an attempt to evaluate the antifungal activity of ethanolic extract of Croton aromaticus leav...
Article
Full-text available
Polyaromatic hydrocarbons (PAHs), which are the major by-products of fossil fuel burning, are released to the environment with the immense growth of urbanization and industrialization. These pollutants are subsequently deposited on many substrates including plant surfaces. Due to their toxicity, mutagenicity, carcinogenicity and recalcitrant nature...
Article
Full-text available
Two bacterial strains, Alcaligenes feacalis and Alcaligenes sp. 11SO isolated from the phyllosphere of four ornamental plant species, Ixora chinensis, Ervatamia divaricata, Hibiscus rosa-sinensis and Amaranthus cruentus found in five highly polluted sites in Sri Lanka, showed a higher level of phenanthrene and naphthalene degradation ability. Both...
Article
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The phyllosphere of Ixora chinensis, Ervatamia divaricata, Hibiscus rosa-sinensis and Amaranthus cruentus, which are highly abundant on roadsides of five polluted areas in Sri Lanka (Colombo Fort, Maradana, Orugodawattha, Panchikawattha and Sapugaskanda) were rich in aromatic hydrocarbon (AH) degrading phyllosphere fungi compared to the plants from...
Article
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Polyaromatic hydrocarbonic (PAH) air pollution through vehicular and industrial emission is a highly concerned great threat in the modern world. The ability of bacteria, highly abundant in the phyllosphere of polluted and urbanized areas to degrade these deposited PAH pollutants into non-toxic levels was assessed and analyzed the concentrations of...
Article
Full-text available
Effect of Croton aromaticus aqueous, hot water and ethanolic leaf extracts alone and in combination with alum against banana crown rot causing fungal pathogens were investigated using 96 well plate bioassay and liquid bioassay in vitro. According to the results of 96 well plate assay, C. aromaticus aqueous extract successfully inhibited conidial ge...
Article
Full-text available
Application of aromatic hydrocarbon degrading fungi to bioremediate aromatic hydrocarbonic (AH) pollutants is a current trend and many research on the use of such fungi to remediate aromatic hydrocarbonic pollutants in temperate situations have been reported. Bioremediation of these hydrocarbons is through an array of lignolitic and non lignolitic...
Article
Full-text available
Cavendish is the widely grown banana cultivar in the world today and the most prominent cultivar in the international trade. Crown rot, one of the most drastic postharvest diseases of Cavendish banana can cause severe postharvest loss both in the local and export markets. In the industry, cut crowns of banana are treated with fungicides to control...
Article
Full-text available
Cavendish is the widely grown banana cultivar in the world today and the most prominent cultivar in the international trade. Crown rot, one of the most drastic postharvest diseases of Cavendish banana can cause severe postharvest loss both in the local and export markets. In the industry, cut crowns of banana are treated with fungicides to control...
Poster
Full-text available
Based on availability, the amount of above ground bio-mass and the degree of use as compost in traditional farming systems Tithonia diversifolia, Chromolaena odorata, Mikania scandens, Lantana camara, Wedelia trilobata, Mimosa pigra and Panicum maximum were selected for nutrient analysis, with an attempt to investigate their potential to be utilize...
Poster
Full-text available
Chundikulam sanctuary is a reserve which is located in the Northern Province, in Jaffna peninsula. This reserve is situated in the dry zone of Sri Lanka and the area consists of mangroves along the shores and scrub lands in the sandy areas. The Jaffna peninsula, including Chundikulam, faced an ecological destruction due to the Sri Lankan civil war...
Conference Paper
Full-text available
Crown rot disease is the major post harvest disease in Embul banana causing severe post harvest loss both in terms of quality and quantity. Due to hazardous effects of fungicides, use of eco-friendly methods of controlling crown rot disease are being investigated throughout the world. In this study, efficacy of alum (sodium aluminium sulphate) in c...