Evaluating the Resistance of Various Potato Genotypes to Early Blight Disease Caused by Alternaria alternata

Subject Areas : Research On Crop Ecophysiology

NEDA PEYMANI ¹ , AHMADREZA GOLPARVAR ² , MEHDI NASR-ESFAHANI ³ , ESMAEIL MAHMOUDI ⁴ , MAJID SHAMS ⁵

1 - Department of Agronomy and Plant Breeding, College of Agriculture, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
2 - Department of Agronomy and Plant Breeding, College of Agriculture, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
3 - Department of Plant Protection Research, Isfahan Agriculture and Natural Resource Research and Education Center (AREEO), Isfahan, Iran
4 - Department of Plant Pathology, College of Agriculture, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
5 - Department of Agronomy and Plant Breeding, College of Agriculture, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran

Received: 2022-12-12 Accepted : 2022-12-12 Published : 2020-06-01

Keywords: genetic diversity, biomass, Disease severity, Keywords: Resistance,

Abstract :

Original ResearchEvaluating the Resistance of Various Potato Genotypes to Early Blight Disease Caused by Alternaria alternataNeda Peymani1, Ahmadreza Golparvar1*, Mehdi Nasr-Esfahani2, Esmaeil Mahmoudi3, Majid Shams11- Department of Agronomy and Plant Breeding, College of Agriculture, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran2- Department of Plant Protection Research, Isfahan Agriculture and Natural ResourceResearch and Education Center (AREEO), Isfahan, Iran3- Department of Plant Pathology, College of Agriculture, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran*Corresponding author E-mail: [e-mail]: 10 March 2020 Accepted: 22 May 2020AbstractEarly blight disease (caused by Alternaria alternata (Fr.) Keissler) is one of the most important potato diseases around the world which causes the death of the leaf tissues and sharp decrease in the final yield. Identifying and using resistant potato cultivars is one of the effective methods to deal with this disease. In the current study, the resistance of 46 potato genotypes (including 24 genotypes of Isfahan and 22 common genotypes of Isfahan and Shahrood) were investigated in the field by evaluating the severity of the disease in six levels from 0 to 6 (0-100%). The results showed that there were significant differences between the resistances of different potato genotypes. Three resistant genotypes (R1/33/10, R2/33/3 and R2/33/21) and three sensitive genotypes (8707/106, 8703/804 and 8707/112) were selected to investigate the changes of plant biomass and were inoculated with the spores of the disease-causing fungus (106) in the greenhouse. Biomass parameters showed significant decrease compared to the control samples. The amount of this decrease was much higher in sensitive genotypes than resistant genotypes. The knowledge obtained from this study can be useful for the production of disease-resistant potato cultivars.