Abstract
Provenance and within-provenance genetic variation for stem volume growth in Eucalyptus urophylla was examined in a large trial series of 125 provenance/progeny tests in five countries. In general, heritability (within-provenance) for age-3 volume was around 0.15 for Brazil, Colombia, Mexico, and South Africa and was slightly lower in Venezuela, where tree volume was lower. Provenances from all seven islands in Indonesia where the species occurs were included in the trials. Substantial provenance variation was observed in all countries, with the best provenances showing from 25 to 30 % more volume than the mean. The average of between-country genetic correlation estimates for growth traits was 0.72, both among and within provenances. Provenance and family performance between Mexico and Venezuela were very similar, with estimated provenance and within-provenance genetic correlations of 1.00 and 0.90, respectively. There was some tendency for lower-elevation provenances to show better volume growth, but there were also very large differences observed between provenances located very close to one another. The results underscore the value of extensive provenance collections throughout the range of a species in order to ensure that the very best provenances are being captured.
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Acknowledgments
We would like to recognize the contributions of the Sumalindo researchers who supervised the various seed collections of E. urophylla over the 7-year period from 1996 to 2003. These include Arif Purwanto, Bambang Pepe, Maurits Sipayung, Suhartono Wijoyo, Suyadi, Teddy Sahelangi, Tribowo Suwartono, and Widiyatno. Collection trips would sometimes last 3 weeks and require hiking over difficult terrain for as much as 12 h/day to reach isolated stands. Without the help of these dedicated foresters, none of the genetic material from the Camcore seed collections described in this manuscript would ever have been made available for others to test in field trials across the various countries.
Many thanks also to all of the Camcore membership and particularly those research teams in Argentina, Brazil, Colombia, Mexico, South Africa, and Venezuela for establishing, measuring, and protecting these field trials so that results could be shared with others in the forest community.
Finally, we want to recognize the contributions of Andy Whittier and Robert Jetton (Camcore) for their assistance in map making and extracting precipitation data from prediction models.
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Communicated by: R. Burdon
Data Archiving Statement
Data used for this study are available on the public database Dryad (datadryad.org)
This article is part of the Topical Collection on Breeding
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Hodge, G.R., Dvorak, W.S. Provenance variation and within-provenance genetic parameters in Eucalyptus urophylla across 125 test sites in Brazil, Colombia, Mexico, South Africa and Venezuela. Tree Genetics & Genomes 11, 57 (2015). https://doi.org/10.1007/s11295-015-0889-3
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DOI: https://doi.org/10.1007/s11295-015-0889-3