西瓜花叶病毒(WMV-2)两株系寄主的病生理研究

 以沈阳农大植保系植物病毒研究室提供的WMV-2两株系WMV-2(1)和WMV-2(2)为试材,它们除寄主范围及在某示植物上有症状反应的差异外,亦导致其寄主的病生理反应不同。如接种到西葫芦叶片后,株系的强弱差别亦能反应到叶片叶绿素含量多少。光合作用强度、电导率及过氧化物同工酶活性等指标上,试验初步观察到WMV-2的两个株系其寄主病生理上,存在某些可以分辨的差异,WMV-2(1)对西葫芦叶片内叶绿素的破坏程度、降低光合强度以及过氧化物酶活性升高的程度等均大于WMV-2(2)。由此,作者等初步认为这些病生理指标可作为区分西瓜花叶病毒株系较好的辅助手段。

ON PATHOPHYSIOLOGY OF THE HOST OF TWO STRAINS OF WATERMELON MOSAIC VIRUS (WMV-2)

Two strains of watermelon mosaic virus, WMV- 2(1) and WMV-2(2), were got from The Lab of Plant Virus Disease, Dept. of Plant Protection, Shenyang Agricultural University. The two strains showed different symptomatic responses on plants within host range and indicative plants, and also resulted in different pathophysiological responses of host. When WMV-2(1) and WMV-2(2) were inoculated on an indicative plant, summer squash (Cucurbita pepo) , the differences shown between these two strains were their affections on contents of chlorophyll, intensity of photosynthesis, conductivity and peroxi-dase activities in the host tissues. The results indicated that the host pathophysiology of these two strains was also distinctive, WMV -2(1) showed stronger influence than WMV - 2(2) on destroying chlorophyll, reducing the photosynthesis activity, increasing the activities of peroxidase, etc. . The authors are of the opinion that these criteria could be used as a preliminary step to differentiate the two strains of watermelon mosaic virus.