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Fruit produced by adjacent blocks of `Mauritius' and `Floridian' lychee  (Litchi chinensis  Sonn.) were sampled at four different stages of development and the embryos were analyzed for pollen parentage by phosphoglucose isomerase (PGI; EC 5.3.1.9) isozyme system. Hybrid percentage increased significantly from ≈5 weeks after fruit set to maturity as follows: from 29.5% to 76.3% in `Mauritius' and from 74.2% to 92.5% in `Floridian'. These findings clearly indicate selective abscission of selfed fruitlets. In `Mauritius', yield was not related to the distance from the pollenizer block or hybrid percentage. In `Floridian', yield of trees adjacent to the `Mauritius' pollenizer was higher by 36% than that of trees at a distance of 24 m. The correlation between `Flordian' yield and hybrid percentage tended toward significance  (r=  0.64,  P  = 0.08). In addition, in both cultivars, fruit and seed weights were affected by the pollen parent: outcrossed fruit were heavier and contained heavier seeds than selfed ones.

Pollen Parent Effect on the Selective Abscission of `Mauritius' and `Floridian' Lychee Fruitlets