To clarify the characteristics of root development in high-yielding strawberry ‘Benihoppe’, we investigated the number, elongation rate, respiration rate and the internal morphology of the fine root in ‘Benihoppe’ and ‘Sachinoka’ grown under dry fog cultivation system. Fine root volume per primary root of ‘Benihoppe’ is larger than that of ‘Sachinoka’. ‘Benihoppe’ seemed to possess character of root foramation; many roots generated not only from the tip of the primary root but also from the middle and the base. There was no significant difference in thickness and elongation rate of the fine root between the two cultivars, but the fine root respiration rate of ‘Benihoppe’ was higher than that of ‘Sachinoka’ at 10 days after rooting. In addition, from the observation of the internal morphology, ‘Benihoppe’ showed a tendency to be greater in the number of occurrences of root hair comparing to ‘Sachinoka’. The results indicate that ‘Benihoppe’ possesses a large number of fine roots per primary root. Therefore, we concluded that ‘Benihoppe’ is a high-yielding because of large surface area of the root system which enhances to absorb nutrient solution.

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