Which part of the Tokay grapevine is primarily responsible for fruit production?

The part of the Tokay grapevine that is primarily responsible for fruit production is the fruiting spurs. Fruiting spurs are specialized buds that develop in the previous growing season and are specifically formed to bear grapes. These spurs allow for optimal fruit development by producing clusters of grapes.

While the main trunk supports the entire structure of the vine and the roots are essential for nutrient absorption, their roles are not directly involved in fruit production. The leaves are crucial for photosynthesis, as they capture sunlight to produce energy needed for growth and fruit ripening, but they do not directly bear the fruit. Therefore, the fruiting spurs are the key components in the grapevine responsible for producing the actual grapes.