Genetics of Brazil nut (Bertholletia excelsa Humb. & Bonpl.: Lecythidaceae) 2. Mating system

O'Malley, D.M. and Buckley,, D.P. and Prance, G.T. and Bawa, K.S. (1988) Genetics of Brazil nut (Bertholletia excelsa Humb. & Bonpl.: Lecythidaceae) 2. Mating system. Theoretical and Applied Genetics, 76 (6). pp. 929-932.

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Here we report the results of a mating system analysis of an Amazonian population of Bertholletia excelsa, a tropical rain forest canopy tree species. Using progeny data from 29 seed parents, two highly polymorphic isozymes were analyzed to derive single locus and multilocus estimates of outcrossing, based on a mixed mating model. The two single locus estimates were very similar, and both were somewhat smaller than the multilocus estimate, indicating the possibility that the populations are genetically structured. The multilocus outcrossing estimate (tm=0.85±0.03) reveals that outcrossing is prevalent, but that a significantly low level of inbreeding may be occurring. The high outcrossing rate indicates that even though dispersion of individuals is very low within populations of this tropical rain forest tree, pollen dispersal mechanisms appear to be adequate to enable crosses with a relatively large number of potential mates.

Item Type: Article
Additional Information: Supported by NSF grants BSR 8300343, BSR 8414295, a Healey grant from the University of Massachusetts, and a Biomedical Research support grant from the University of Massachusetts, Botson.
Uncontrolled Keywords: Outcrossing rate, Bertholletia excelsa, Brazil nut, Isozyme analysis, Tropical rain forest.
Author Affiliation: Department of Forestry, University of New Hampshire, 03824, Durham, NH, USA
Subjects: Crop Improvement > Genetics/Genomics
Crop Improvement > Biotechnology
Divisions: Groundnut
Depositing User: Mr Balakrishna Garadasu
Date Deposited: 06 Mar 2013 14:43
Last Modified: 06 Mar 2013 14:43
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