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Title: A Comparative Study of Two Cucumber Mosaic Virus (CMV) Strains on Biochemical Parameters and Photosynthetic Apparatus in Infected Tomato and Squash Plants
Authors: نوره يوسف نايف 
Supervisor: د.مجدي منتصر
Keywords: Cucumber Mosaic Virus (CMV) Photosynthetic Apparatus
Issue Date: 2015
Publisher:  Kuwait university - college of graduate studies
Abstract: This study was aimed to compare the influence of two viral strains, the CMV-KU1 and CMV-16 strain on different biochemical parameters with emphasis on carotenoids, fatty acids and phenolic compounds in squash and tomato plants. A time related study was carried out. Squash plants, infected with CMV-16, showed a decrease in β-carotein content with a concomitant increase in lutein by which the ratio of lutein/ β-carotein significantly increased by 62% (p<0.05) compared with the control plants. However, the change in lutein/β-carotein ratio was less pronounced in tomato plants. In response to CMV-16 infection, the desaturation index indicated by unsaturated/ saturated fatty acids (UFA/SFA) increased in both squash and tomato plants, indicating that stress in test plants. Phenolic content in squash plants were significantly changed in response to CMV-16 inoculation. In CMV-16 infected squash plants, phenolic accumulation increased sharply indicating that plant tolerance for the viral infection. CMV-16 in tomato had weaker impact on phenolic content compared with squash plants. This might be due to a possible involvement of symptom development and defence mechanisms due to plant-virus interactions. All biochemical parameters studied were not significantly influenced in test plants infected with CMV-KU1 compared with the severe CMV-16. Satellite RNA in the CMV-KU1 may have protected plants against infection caused by virulent strains. Our results indicated that CMV-KU1 is benign to crops compared to the severe viral strain of CMV-16.
Appears in Programs:0496 Biochemistry

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