Investigating Effect of Gibberellin Acid on Dormancy Breaking and Germination Speed and Yield of Potato Cultivars

Abstract

BACKGROUND: Growth regulator compounds, especially plant hormones, also affect the plant growth process. OBJECTIVES: Current research was done to investigate the effect of hormonal treatment (gibberellin acid) and physical (cold) treatment on potato micro tuber dormancy, germination speed and yield of two potato cultivars (Banba and Arinda). METHODS: This study was conducted according factorial experiment based on a completely randomized design with three repetitions in the research laboratories of the Institute of Seed and Seedling Production. The first factor included of the potato variety at two levels (Banba and Arinda), and growth stimulant including gibberellin acid at four levels (0, 25, 50, 100 mg.l-1) belonged to second factor. RESULT: The examined traits included the day until the appearance of the sting, the number of micro tubers, the fresh weight of the tubers, and the length of the stolen. Based on the results obtained from the effect of gibberellin acid concentration on important traits such as the number of micro tubers, stolon length, which shows a high correlation with the fresh weight of the tubers, and the number of days until the appearance of the first bite, which will indicate the effectiveness of this substance in breaking dormancy. CONCLUSION: The concentration of 50 mg of gibberellin acid has the best results and can be recommended to increase the speed of breaking dormancy, as well as more uniformity and more production. Based on the general results of the cultivars used in this experiment, except for the trait of tuber wet weight, which was more in the case of Arinda than Banba, they did not differ much and showed high genetic similarity in the measured traits.