Physiological Response of Sugar Beet to Viral Diseases of Rhizomania

Document Type : Research Article

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Abstract

Rhizomania disease is one of the most important threats to worldwide and Iran sugar beet cultivation. Many studies have been done to understanding the physiological effects of the disease on sugar beet, but in Iran conditions has not been done any study for this purpose. This experiment was conducted with four sugar beet cultivars named as Brigita, Zarghan, Jolge and Rasoul in 2010 and natural infested soil in Mashhad. Results of the experiment showed that rhizomania disease affected morphological and physiological characteristics of susceptible sugar beet cultivars. Rhizomania disease decreased green area and leaf photosynthetic performance. In infected plants, the tap root and lateral roots became necrotic and die, and these changes caused decreasing of absorption ability of water and nutrition by root. These adverse changes caused the sugar beet storage root yield was decreased.

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