عنوان مقاله [English]
In order to study the effect of planting date, cultivar and mycorrhiza on growth traits and antioxidant activity in potato, a split factorial experiment was conducted based on a randomized complete block design with three replications in the of Payame Noor University in Fereidoun Shahr during. The experimental treatments were planting date as the main plot in three levels and the factorial arrangement of three potato cultivars and two levels of fungi as subplots. The results showed that the effect of planting date on all studied traits was significant except for leaf area index. Also, planting at 5 May or 5 June produced the highest potato tuber yield with Arinda cultivar. In general, It was determined that the planting date of 20 May due to the interaction of stages of plant growth to the maximum temperature of the region affected by environmental stresses, which had a negative effect on the length of the planting period to maturity stage, thereby reducing potato tuber yield in Fereydounshahr region. Mycorrhiza had a positive effect on root development, improved the activity of root and leaf antioxidant enzymes and also increased length, number of main and lateral branches, root and shoot dry weight, and leaf number of potato tubers. Overall, the Agria cultivar had less tolerance to the environmental stresses compared to the other two cultivars due to less production of root and leaf antioxidant systems, which resulted in the short number of the main and minor branches and fewer tuber yields with (39.2% and 9.8%) or without mycorrhiza (11.3% and 19.9%) in all planting dates.