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Articles by O. Radziah
Total Records ( 5 ) for O. Radziah
  M.M. Tahat , S. Kamaruzaman , O. Radziah , J. Kadir and H.N. Masdek
  The ability of endomycorrhizal fungi to colonize tomato (Lycopersicum esculentum. Mill) roots, was studied under glasshouse conditions. Two indigenous species; Glomus mosseae and Scutellospora sp. and non-indigenous species Gigaspora margarita were used in the study. Pot culture technique was used for re-culturing G. mosseae and Scutellospora sp., sorghum was used as a trap host. Gigaspora margarita was re-cultured by test tube technique. All species had the ability to colonize tomato root with different colonization levels. Significantly higher root were colonized by G. mosseae (80%) compared to G. margarita (20%). A G. mosseae significantly increased shoot dry weight (2.82 g) and flowers number (32.75 g) and root growth. Tomato plants treated by G. mosseae were higher significantly after seven week of plant growth. The colonization of tomato root by G. mosseae lead to bigger root size and more branching which increase positively the number of root tips, length, surface area and root volume. Higher spores (455/100 g) were counted in Glomus mosseae inoculated plant compared to Scutellospora sp. (250/100 g) and G. margarita plant (132/100 g).
  M.M. Tahat , S. Kamaruzaman , O. Radziah , J. Kadir and H.N. Masdek
  The study aimed to select plant host for multiplication of Glomus mosseae spores. Five plant species were used [(corn, (Zea mays) sorghum, (Sorghum bicolor) lentil, (Lens culinaris), barley, (Hordeum vulgare) and green bean, (Phaseolus vulgaris)]. Plants were inoculated with Glomus mosseae and grown for 75 days under glasshouse conditions. Mycorrhizal sporulation and colonization of all plant hosts were assessed at different sampling periods. At 75 days of growth the highest number of Glomus mosseae spores was found in mycorrhizosphere of corn plant (167 spore/10 g soil), while the lowest in the mycorrhizosphere of barley (35 spore/10 g soil). The highest percentage of root colonization was in corn (76%), while the lowest colonization was found in green bean (24%). Corn was the most suitable host for spore production of Glomus mosseae and to extensive root colonization. It was recorded that plants having more colonization percentage were able to produce more Glomus mosseae spores. The study indicated that different plant species significantly influenced the root spore production and root colonization percentage of Glomus mosseae.
  U.A. Naher , O. Radziah , M.S. Halimi , Z.H. Shamsuddin and I.M. Razi
  A study was conducted in in vitro condition to determine the specific growth rate, sugar consumption and generation time of four diazotrophic bacterial species, Burkholderia, Rhizobium and two Corynebacterium sp. in four different carbon substrates. Growth of all bacterial strains was significantly affected by the sugars. Burkholderia sp. (Sb13) rapidly attained maximum population in glucose, fructose and sucrose and the specific growth rate best fitted with exponential model. The cell generation times of Burkholderia sp. (Sb13) in glucose, fructose and sucrose substrate were 0.4, 0.55 and 0.1 h, respectively. Rhizobium sp. (Sb16) followed an exponential growth model in fructose and its generation time was 0.62 h. The growth of Corynebacterium sp. (Sb26) was higher in arabinose and followed logarithmic growth model with generation time of 0.68 h. Corynebacterium sp. (Sb35) showed faster generation time (1 h) in sucrose substrates and the specific growth rate in all four carbon substrates followed logarithmic model of growth phase. Burkholderia sp. and Corynebacterium sp. (Sb26) consumed 100% of arabinose after 36 h of incubation period. The total sugar consumption by the diazotrophs were higher in logarithmic model of growth phase compared to exponential, power and polynomial model.
  M.M. Tahat , O. Radziah , S. Kamaruzaman , J. Kadir and N.H. Masdek
  A pot study was aimed to investigate the role of tomato in determining differential response to bacterial wilt causal agent Ralstonia solanacearum pathogen and arbuscular mycorrhizal fungi (AMF) Glomus mosseae. Disease severity was measured after 10, 20 and 30 days of plant growth. The pathogen and dual treatment (R. solanacearum with G. mosseae) were not significantly different at the end of this experiment. Soil pH was greatly influencing the pathogen and AMF microbe. Glomus mosseae mycorrhizosphere was more alkaline (pH 5.9) compared to the pathogen mycorrhizosphere (pH 4.9). The concentration of bacterial cell in the R. solancearum soil was not different from the dual treatment after 60 days of plant growth. Spore germination was influenced by the interaction between the soil pathogen and AMF. Spores number in the dual treatment at 60 days was less than the original number added. Root colonization percentage in G. mosseae (61%) was significantly more than the dual treatment (16%). This provide an evidence about the role of plant host in increasing the spores germination influenced by many substances produced by the host root (root exudates). The results demonstrated that the role of plant in determination the relationship between soil-borne pathogen and antagonistic microbe was critical.
  U.A. Naher , O. Radziah , M.S. Halimi , Z.H. Shamsuddin and I. Mohd Razi
  An experiment was conducted in axenic condition to study the effect of Corynebacterium sp. (Sb26) and Rhizobium sp. (Sb16) inoculation on the root exudates carbon sugars and amino acid production in three different rice (Oryza sativa) genotypes. A total of seven carbon sugars and 16 amino acids were determined from the Mahsuri, Mayang Segumpal and MR219 rice root exudates. The concentration of root exudate sugars, amino acids and its released pattern were significantly different with rice genotypes. Mahsuri released the highest sugar (25.73%) followed by MR219 and Mayang Segumpal (23.14% and 20.85% of plant dry wt.) rice, respectively. Inoculated plants produced different amount of sugar and amino acids in the presence of diazotrophs compared to non inoculated plants. Mahsuri rice inoculated with Corynebacterium sp. released the highest amount of fructose (791 μmol g-1 root dry wt.) and arabinose (640 μmol g-1 root dry wt.). Mayang Segumpal rice inoculated with Rhizobium sp. produced the highest amount of sucrose μmol g-1 root dry wt in the root exudate. A significantly higher amount of glycine and isoleucine were detected in the inoculated root exudates of all rice varieties. However, inoculation enhanced production of sugars and amino acids in root exudates. In general rice genotypes inoculated with Rhizobium sp. produced higher amount of total sugars and amino acids in root exudates compared to that of Corynebacterium sp.
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