Asian Science Citation Index is committed to provide an authoritative, trusted and significant information by the coverage of the most important and influential journals to meet the needs of the global scientific community.  
ASCI Database
308-Lasani Town,
Sargodha Road,
Faisalabad, Pakistan
Fax: +92-41-8815544
Contact Via Web
Suggest a Journal
 
Articles by Khalaf M. Alhussaen
Total Records ( 3 ) for Khalaf M. Alhussaen
  Khalaf M. Alhussaen
  Pythium ultimum and Fusarium oxysporum are important pathogens in agriculture crops and cause serious diseases that resulted in reducing the yield of many crops. The effect of soil acidity on the occurrence and severity of diseases caused by Pythium ultimum and Fusarium oxysporum were examined. Pathogens were grew at pH levels of 2-10 in vitro. Pythium ultimum and Fusarium oxysporum isolates have an optimum growth pH level of 6 and 7 and grew well at pH level of 5 and slightly at pH level of 4 and 8 but no growth at pH levels of 2, 3, 9 and 10. Six treatments (4, 5, 6, 7, 8 and 9) were tested in vivo to examine the effect of soil pH on the occurrence and severity of disease. The pH level of 5 was the best for plant growth but not to both pathogens. However, more disease severity by the two pathogens were found at the pH levels of 6 and 7. The pH levels could be used to reduce the plant disease reduction by knowing the optimum levels for plants and pathogens.
  Khalaf M. Alhussaen
  The pathogen of Pythium aphanidermatum is a very important pathogen causing disease and yield losses on vegetables. Correct identification of pathogens lead to correct and effective control strategies and methods. However, the traditional methods based on morphological and physiological identification becomes difficult and time consuming because of the similarity amongst the different groups of species and intraspecific morphological variation frequently observed in different field isolates. Molecular techniques based on several DNA methods have been developed to identify Pythium spp. and also to understand the relationships between species. Morphology and physiology characteristics of Pythium aphanidermatum were investigated for identification and variability. The optimum pH levels of Pythium aphanidermatum grow in vitro were 7 and the optimum growing temperatures of the isolates recovery in this study was 30°C. The mycelial were thick and white with fluffy topography. Each isolate produced aseptate, hyaline mycelium, the oogonia terminal, globose and smooth. Antheridia mostly intercalary, sometimes, broadly sac shaped, monoclinous or diclinous, thick walled aplerotic oospores and lobed sporangia. Sequences of selected isolates obtained in this study were matched Pythium aphanidermatum (KY646468) from GenBank. The UPGMA dendrogram showed that there were variations within the population of Pythium aphanidermatum at similarity coefficient 0.1. These isolates obtained from diseased cucumber plants collected from different farms in the Jordan Valley in April 2017.
  Khalaf M. Alhussaen
  Alternaria solani is known economically important and the casual agent of early blight on potato and tomato. Identification of plant pathogens is very important in helping to find effective disease control or management methods. Morphology and physiology characteristics of Alternaria solani were investigated for identification and variability. The optimum pH levels of Alternaria solani grow in vitro were 6-7 and the optimum growing temperatures of the isolates recovery in this study was 25 and 30°C. The mycelial width between 0.8-1.5 μm and the conidia are 35-75 μm in length and 10-20 μm in width and 2-7 transverse septa and 1-4 longitudinal septa. This study pointed that there was a variation in the population of Alternaria solani isolated from Jordan valley based on morphology and physiology characteristics.
 
 
 
Copyright   |   Desclaimer   |    Privacy Policy   |   Browsers   |   Accessibility