Haroun , S. A. <br/><br/>
Protective role of β-sitosterol or gibberellic acid to Lycopersicum Esculentum cultivars under temperature stress  [electronic resource] 
  دور كلا من بيتا-سيتوستيرول او حمض الجبريليك في وقاية اصناف نبات الطماطم (Lycopersicum Esculentum) المزروعة تحت الاجهاد الحراري 

 - p. 233-248. 
<br/><br/>Includes bibliographic reference 
<br/><br/> THIS STUDY investigate the efficacy of ?-sitosterol (10-3, 10-5 and 10-7 molar) or gibberellic acid (100ppm) on alleviating harmful effects <br/>of temperature stress (10oC and 45oC) on three cultivars of Lycopersicum esculentum Mill., mainly Fayrouz, Aziza and N23-48 to the purpose the <br/>activities of some antioxidant enzymes, protein patterns and DNA finger print in order to focus on the role of ?-sitosterol or gibberellic acid for <br/>enhancing plant tolerance against temperature stress. It was found that, temperature stress (10oC and 45oC) decreased the activities of catalase and <br/>peroxidase, while ?-sitosterol (10-3, 10-5 and 10-7 molar) or gibberellic acid (100ppm) enhanced these enzymes activity. The electrophoresis studies <br/>showed that some new protein bands and DNA finger print were observed probably to increase plant tolerance against temperature stress. These results <br/>give a positive indication of the use of ?-sitosterol specially 10-5 molar or gibberellic acid in field application to ameliorate the toxic effects <br/>of temperature on tomato plants. 
<br/><br/><br/>Summary in Arabic 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Tomatoes --Effect of temperature on.<br/>Gibberellic acid<br/>Enzymes<br/>Proteins<br/>Fingerprints