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Fruits produced in two orchards, each consisting of adjacent blocks of 'Floridian' and 'Mauritius' lychee ( Litchi chinensis Sonn.), were unequivocally identified as selfed or outcrossed by phosphoglucos e isomerase (PGP; EC 5.3.1.9) isozyme analysis. The average rate of hybrid production in each orchard was 69% and 87% for 'Floridian' and 17% and 65% for 'Mauritius', respectively. The percentage of hybrids produced on trees adjacent to those of the other cultivar was invariably significantly higher than that produced on the more distant trees. However a significant correlation between hybrid percentage and proximity to the other cultivar, as well as between hybrid percentage and yield, was found only for 'Floridian' in one of the orchards. A significant correlation was found between pollen source and the weights of fruits and seeds in both cultivars. Fruits originating from cross-pollination were heavier and contained heavier seeds than selfed fruits. The most pronounced effect of pollen parent on seed weight was found in 'Floridian', which appears to exhibit inbreeding depression.

Pollen Parent Effect on Outcrossing Rate, Yield, and Fruit Characteristics of `Floridian' and `Mauritius' Lychee