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Articles by Y. Awang
Total Records ( 5 ) for Y. Awang
  Y. Noor Shahida , Y. Awang , K. Sijam , M.A. Noriha and M.G.M. Satar
  Background and Objective: Papaya (Carica papaya) is a well-known tropical fruit consumed worldwide but its expansion is seriously impaired by many diseases including dieback caused by Erwinia mallotivora. In this study, development of dieback and changes in total phenol, total sugar, total protein, peroxidase activity, polyphenol oxidase activity and leaf photosynthesis following the inoculation of E. mallotivora on two papaya cultivars, Eksotika dan Eksotika II were reported. Methodology: Erwinia mallotivora infection (1×108 CFU mL–1, 50 μL injection) to the 8 week old seedlings at the 5th node from the apex caused dieback disease to occur as early as 3 days after inoculation. The inoculated plants were completely destroyed on day 11 after inoculation. Results: Both papaya cultivars had similar trend in their physiological and biochemical changes toward the infection. Total sugar in leaves of infected plants was higher than those in the non-infected plants, but the stem and the roots of infected plants contained markedly less sugar than those of healthy plants. Erwinia mallotivora infected tissues contained higher concentration of total phenol and total protein and these changes were coupled with higher activity of peroxidase and polyphenol oxidase. Conclusion: Plant experiencing dieback disease also had a lower leaf photosynthetic rate with reduced stomatal conductance.
  N. Alifar , A.R. Zaharah , C.F. Ishak and Y. Awang
  Selenium (Se) plays a major role in human and animal’s diet. Because of the low concentration of Se reported in staple foods such as rice, developing a Se fertilizer strategy would play a key role in increasing Se levels in the human body. Se uptake in relation to morphological root parameters among 6 lowland rice varieties was studied by conducting a solution culture experiment using modified Yoshida solution in Agriculture Faculty of University Putra Malaysia. Three Se levels were developed by the addition of 0, 20 and 200 mgL-1 Na2SeO3 and rice seedlings were harvested in week 4. Se uptake in roots of rice showed significant differences among all varieties and Se uptake significantly increased with increased in Se levels. Other root parameters (length, average diameter, surface area, volume and number of root tips) did not show any significant differences at different Se treatments.
  N. Alifar , A.R. Zaharah , C.F. Ishak , Y. Awang and B. Khayambashi
  Studies on Selenium adsorption was conducted in laboratory studies for some different rice growing soils of Malaysia at pH 4 and 7. Soils were equilibrated with 0.01 M CaCl2 and Na2SeO3 solution to measure relative adsorption of Selenium as sodium Selenite ions. In general, the adsorption of Se on different soils at both pH, increased with increase in the level of Se added. Adsorption data were fitted well to Langmuir model. Maximum adsorption (Qm) was correlated with organic carbon at both pH 4 (R = 0.77**) and pH 7 (R = 0.76**) and log K (R = 0.71** and R = 00.81**) at pH 4 and 7 respectively and also Qm was correlated with percent of clay (R = 0.59*) and CEC (R = 0.58*) at pH 7. Desorption data showed the higher amount of desorbed Se was achieved at pH 7 than pH 4 in all type of soil except TIP2, KBK, Mb and UPM.
  K. Nur Izzah , Y. Awang , P. Ding , Y. Hafiza and M.G.M. Satar
  This study reports the effectiveness of various concentrations of ascorbic acid, citric acid and oxalic acid used as acidulants to regulate activities of antioxidant, polygalacturonase, pectin methylesterase and polyphenol oxidase of fresh-cut wax apple (Syzygium samarangense). The samples of fresh-cut wax apple, cut in wedges (1/8), were dipped into ascorbic acid, citric acid and oxalic acid at four different concentrations (0, 0.5, 1.0, 1.5 and 2.0%) for 1 min. The changes in the parameters were monitored for nine days while they are in storage at 4°C. Fruit treated with oxalic acid contained the highest antioxidant activity, followed by those treated with citric acid and ascorbic acid. The activity of antioxidant increased with the increasing storage period. Similar effects of acid treatments were detected for total phenolic contents. There was no effect of types of organic acids on polygalacturonase activity but acid dipping reduced the activity of the enzyme. In contrast, types of acids and acid concentration did not alter the activity of pectin methylesterase activity. Activity of pectin methylesterase in fruit sampled on day 6 and 9 were higher than those of the earlier dates. Similar pattern of effects of acid treatment were observed for polyphenol oxidase activity.
  M. Masyahit , K. Sijam , Y. Awang and M.G.M. Satar
  Knowing the unfavorable environment for the growth of a pathogen can be utilized as the basic information in developing appropriate strategies to prevent disease occurrence on dragon fruit. Several environmental factors including temperature, pH and salinity, as well as biotic factor including three antagonistic bacteria species, namely Bukholderia cepacia, B. multivorans and Pseudomonas aeruginosa against Bipolaris sp., Colletotrichum gloeosporioides, Botryosphaeria sp. and Monilinia sp., were investigated. Mycelial growth of all tested fungi was constantly inhibited by a temperature of 35°C, while a temperature of 25°C was quite suitable for their growth. A temperature of 30°C was favorable for the growth of Colletotrichum gloeosporioides. Under different pH condition, the growth of tested fungi was mostly inhibited by extreme pH of 4 and 10. The salinity assay showed that Monilinia sp. was not affected by all treatments among tested fungi. Only concentration 100 ppm could reduce the growth of Bipolaris sp., though its inhibition statistically affected on 4 and 6 Days after Incubation (DAI). Meanwhile, the in vitro examination of antagonistic bacteria resulted in Bukholderia multivorans which was highly effective in inhibiting the growth of examined fungi, except Monilinia sp., which was more significantly influenced by B. multivorans and B. cepacia. The proper combination of environmental modification may be useful for the growth of crop in the field as well as the storage life of the fruit at postharvest preservation.
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