A Potential Elicitor of Green Alga (Ulva lactuca) and Commercial Algae Products against Late Blight Disease of Solanum tuberosum L.

Soad M. Ahmed, Saad R. El-Zemity, Rasha E. Selim, Fahmy A. Kassem


The phenomenon of systemic acquired resistance has attracted attention as a new strategy for controlling plant disease. The resistance was evident as a reduction in disease incidence compared with infected control. The objective of this research was to determine the efficacy of green alga (Ulva lactuca) extract and some Commercial algae products for management of late blight disease of two varieties of potatoes (Lady pulford and Burren) under field conditions. Also, we investigated the ability of these algae to elicit induced resistance in potato against late blight disease caused by Phytophthora infestans, through, their effects on biochemical changes which lead to induction of plant defense against the pathogen. A negative correlation between the disease severity and the content of total soluble polyphenols , this correlation reached to 50% in Burren variety while it was 67% in the variety Lady pulford. Negative correlation between the disease severity index and total protein was found also and the correlation reached to 80% in the variety Lady pulford. The same trend was also noticed in PPO and RNase. So, Lady Pulford is more tolerant to the disease than Burren. Finally, we could say the use of algae extract might help to overcome the pathogen infection by increasing levels of defense-related enzymes and phenolic and protein substances.


Algae, Potato, Late blight, Elicitor

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