Self-incompatibility in ‘Matou’ Wentan (Citrus grandis (L.) Osb.)1

Abstract ‘Matou’ wentan (pummelo) is usually seedless in Taiwan. However, about 8% of the fruits on the market are seedy. In controlled pollination tests, ‘Matou’ was self-incompatible and highly parthenocarpic. Seedy fruits in commercial orchards are apparently from pollination by trees of other cultivars such as ‘Liucheng’ ( C . sinensis Osb.), ‘Ponkan’ ( C . ponkan Tan.), and especially ‘Paiyu’ and ‘Hwungyu’ ( C grandis ) . Seedy fruits of ‘Matou’ wentan could be prevented by excluding other citrus cultivars from the orchard.