Abstract
Kyoho' grapevines cultivated in Ningxia, China, set a high percent of seeded berries compared with the same cultivar grown in Okayama, Japan which usually sets a lot of seedless shot berries. To clarify the differences in berry set, we compared these 'Kyoho' in terms of shoot and pistil growth, ovule development, and pollen tube penetration into the ovules. Shoot growth was less vigorous and ovule development was less abnormal in 'Kyoho' in Ningxia. Pollen tube penetration into micropyle was more abundant in 'Kyoho' in Ningxia. A better set of seeded berries in Ningxia was discussed as related to its climatic conditions and usage of own-root system.
