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Articles by Mohamad A. Shatnawi
Total Records ( 2 ) for Mohamad A. Shatnawi
  Khalaf Alhussaen , Emad I. Hussein , Khalid M. Al-Batayneh , Mahmoud Al-Khatib , Wesam Al Khateeb , Jacob H. Jacob , Mohamad A. Shatnawi , Ashraf Khashroum and Mohamed I. Hegazy
  Garlic extract is well known for its antibacterial and antifungal activity and is used to treat several plant pathogens. Pythium sp. was isolated from infected tomato seedlings grown in Jordan Valley (Jordan) and the species was identified as Pythium ultimum using morphological and molecular methods. The fungicidal activity of garlic extract with different concentrations in controlling the growth of the isolated Pythium sp. was determined in vitro. The control activity was highly dependent on Garlic extract concentration. For instance, undiluted garlic extract showed the highest control activity with no growth as compared to the biotic control without the extract whereas diluted garlic extracts 10 and 5% reduced the fungal growth to 15.5 and 41%, respectively. The results of this study show that garlic extract could successfully control Pythium ultimum on tomato seedlings and is considered as an environmentally friendly product.
  Aida Al-Nashash , Hussein Migdadi , Mohamad A. Shatnawi , Hani Saoub and Sameer Masoud
  A field study was carried to assess phenotypic variation for 32 barely landraces in Jordan collected from two divese environments. Three long-term checks: Harmal, Zanbaka and Arta were also used in this study. Triple lattice design with three replications was used. Half of the collected barely landraces were six-row type that dominated in Ajlun area (favorable environments) and the remaining landraces were two-row type that dominated in Muwaqqar area (dry environment). This reflects the expected landrace adaptability to the stressful climatic conditions. The phenotypic variation exhibited by the landraces for 13 quantitative traits indicated that these landraces are heterogeneous populations to various degrees for most desirable agronomic traits, except for growth habit and early growth vigor that were monomorphic. Considering all traits, the average diversity index (H’) for the collected landraces was 0.71 ± 0.05. Similarity indices using Euclidean distances ranged from 0.99 to 0.60 with an average of 0.81. Wide range of similarity confirmed the high level of phenotypic polymorphism. Collected landraces were completely separated into two main clusters according to the row types and the collection sites. The first canonical variable, on average, explained 89.1% of the total variation and shows that spike weight, grain yield/plant and grains/spikelets are the major discriminating coefficient among clusters. Jordanian barely landraces have higher level of diversity in desirable traits that can be exploited in breeding programs.
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