Outcrossing rate in adjacent 'Maya' and 'Tommy Atkins' mango blocks.
Degani C., Yutko O., El-Batsri R., Gazit S.
Author Affiliation: Institute of Horticulture, Agricultural Research Organization, Volcani Center, Bet-Dagan, Israel.
Scientia Horticulturae 70 : 25-30
Abstract : Outcrossing rate in mature fruits of mango (Mangifera indica) was studied for the first time in an orchard in the Lower Golan, Israel, consisting of two adjacent blocks of cultivars Maya and Tommy Atkins. Few polyembryonic rootstocks were detected in the blocks. Outcrossing rates were determined at different distances from the pollenizer block using the polymorphic enzyme systems triosephosphate isomerase and isocitrate dehydrogenase. The outcrossing rate was measured in Maya for two consecutive years and in Tommy Atkins for one year. In all three cases, a pronounced decrease in hybridization rate was found between fruits sampled from the row bordering the second cultivar and that from the most distant row sampled (108 m and 96 m for Maya in 1992 and 1993, respectively, and 80 m for Tommy Atkins). Outcrossing rates were: 63% and 34% for Maya in 1992; 57% and 39% for Maya in 1993, and 79% and 24% for Tommy Atkins, for fruits sampled from the row closest to and most distant from the pollenizing cultivar, respectively.