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Articles by L.C. Ng
Total Records ( 3 ) for L.C. Ng
  L.C. Ng , A. Ngadin , M. Azhari and N.A. Zahari
  Bakanae disease is a major rice disease caused by Fusarium fujikuroi. Infected plants show slender and hyper elongated internodes due to the over-production of gibberellic acid. Application of Trichoderma spp. as biocontrol agent is gaining attention due to high capability in hyperparasitize the soil borne pathogen. The studies aimed to screen and evaluate the bio-efficacy of Trichoderma spp. with antagonistic activities against F. fujikuroi and plant growth-promoting properties. All the 65 Trichoderma isolates were isolated from healthy rice rhizosphere soil. Thirty eight out of 65 Trichoderma isolates exhibited more than 45 Percentage of Inhibition Radial Growth (PIRG) against F. fujikuroi in dual culture plate testing. All selected Trichoderma isolates were further in vitro screened for antagonistic testing: volatile compounds production and hydrogen cyanide production and plant growth-promotion properties: IAA production and phosphate solubilization. Twelve Trichoderma isolates were selected for further evaluation on antagonistic activity against F. fujikuroi, germination rate, plumule and radical lengths and vigor index. Finally, seven of the most potential Trichoderma isolates were selected for greenhouse evaluation. The bakanae disease incidence and disease severity in rice plant treated with respective selected Trichoderma isolates were significant reduced as compared with untreated plant. However, there was no significant increase in plant height between Trichoderma inoculated and uninoculated plants. Moreover, rice plant treated with Trichoderma T61 showed significantly increase in total plant dry biomass as compared to untreated plants. The selected Trichoderma isolates have potential to be developed as biological control agent against F. fujikuroi and also as an alternative for bakanae management.
  L.C. Ng , S.N.A. Anuar , J.W. Jong and M.S.H. Elham
  Background: Silicon is an important element for plant development and increases plant resistance against biotic and abiotic stresses. This study aimed to screen and evaluate potential silicon-solubilising rhizobacteria (SSR) with plant growth-promoting properties and inhibitory activities against rice sheath blight pathogen Rhizoctonia solani. Materials and Methods: The SSR were isolated from the disease-free rice field usi1ng magnesium trisilicate media. All isolates were screened in vitro for plant growth-promotion properties: The production of IAA and phosphate solubilisation. The inhibitory activities against R. solani : Dual culture testing, the production of volatile compound and hydrogen cyanide. The potential SSR isolates were identified using VITEK 2 system. Results: A total of 31 potential SSR were isolated from rice rhizosphere soil. Eight most potential SSR isolates were selected out of 31 SSR isolates obtained for further screening of the diffusible antibiotics and extracellular metabolites production against R. solani. Five SSR isolates (SSR2, SSR13, SSR24, SSR25 and SSR26) were selected as potential plant growth promoters with inhibitory effects against R. solani. Under greenhouse conditions, rice plants treated with SSR13, SSR24 and SSR26 showed significantly reduction in rice sheath blight disease incidence with 33.33, 16.67 and 20.00%, respectively, compared to the controls (56.67%). Isolate SSR24 showed a significantly lower disease susceptibility index of only 6%, compared to the control at 59%. Rice plants treated with SSR13 showed the highest plant growth in treatment without R. solani infection. Isolates SSR13 and SSR24 were identified as Serratia marcescens and Pseudomonas aeruginosa, respectively. Conclusion: Isolates Serratia marcescens (SSR13) and Pseudomonas aeruginosa (SSR24) show the most potential to be developed as rice plant growth promoters and also to control of rice sheath blight disease caused by R. solani. This study helps to reduce chemical application in rice sheath blight management toward sustainability in rice production system.
  L.C. Ng , W.A. Ismail and M. Jusoh
  Background and Objective: Roselle (Hibiscus sabdariffa L.) is an important crop used in confectionery, cosmetic and pharmaceutical industries and vascular wilt caused by Fusarium oxysporum is the obstacles in roselle production. Compost has been use to control disease infection in various crops through several suppression mechanisms. However, the bio-efficacy of agro-waste compost in suppression of F. oxysporum in roselle is still unknown. The aim of this study was to evaluate the bio-efficacy of agro-waste compost that would be potential soil suppressive amendment to control F. oxysporum of roselle. Materials and Methods: Three types of agro-waste composts: Vermicompost, crop residue and horse manure compost were used in this study. The direct suppression effects of compost and compost extract on the growth of F. oxysporum were determined. The total microbial population in compost was also evaluated. Results: Generally, the non-sterilized agro-waste compost shown prominent suppressive effects on mycelial growth of F. oxysporum over sterilized compost. Similar results were observed when non-sterilized agro-waste compost extracts at 5, 10, 25 and 50% concentrations were used to suppress the growth of F. oxysporum. Non-sterilized horse manure compost extracts significantly inhibit in vitro mycelial growth of F. oxysporum with 70.84%. The total microbial activity in vermicompost was recorded significantly high with 6.46 μg/mL/0.5 h. However, the total microbial activity in vermicompost was not associated with the suppression effect against F. oxysporum. Conclusion: The suppression activities of compost against F. oxysporum was mainly caused by the biotic factor. However, the total microbial activity in agro-waste compost is not sorely contributed to the suppressive activity against F. oxysporum. The present of the strong antagonist in the non-sterilized agro-waste compost was the key factor to explain the high suppressiveness of the horse manure compost. Whereas, the abiotic factor involved indirectly influent the compost property and the colonization ability of the microorganisms. All composts used have potential to suppress the growth of F. oxysporum, especially the non-sterilized agro-waste composts have higher potential to be developed as soil suppressive amendment against F. oxysporum.
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