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Patterns of hybrid seed production in adjacent seed orchards of Acacia auriculiformis and A. mangium in Vietnam

Le, S, Harwood, CE, Nghiem, CQ, Griffin, AR and Vaillancourt, RE ORCID: 0000-0002-1159-9149 2019 , 'Patterns of hybrid seed production in adjacent seed orchards of Acacia auriculiformis and A. mangium in Vietnam' , Annals of Forest Science, vol. 76, no. 2 , pp. 1-10 , doi: 10.1007/s13595-019-0823-1.

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AbstractKey message Hybrid seed production in adjacent seed orchards of Acacia auriculiformis and Acacia mangium was influenced by (i) flowering times of the two species and (ii) the distances of parent trees from the inter-orchard boundary. Approximately 80% of hybridisation events were found within 60 m from the boundary. ContextUnderstanding pollen dispersal has important implications for breeding and seed production of pure species and hybrid Acacia.AimsWe examined patterns of hybrid production in adjacent clonal seed orchards of A. auriculiformis and A. mangium in Vietnam.MethodsWe assessed the frequency of hybrid offspring using four species-diagnostic SSR markers in seed collected from a total of 72 trees (75 seedlings per tree) at distances ranging from 4 to 144 m from the inter-orchard boundary. The number of hybrid was determined from SSR allele peak sizes in pooled sample (10 seedlings per pool, 540 pools). Calibrations were developed from pools with known proportions of pure-species and hybrid material.ResultsHybrid frequency differed significantly among individual clones (P A. mangium = 3.4%, A. auriculiformis = 2.8%). Two late-flowering clones of A. auriculiformis yielded no hybrids. The level of interspecific hybridisation declined significantly (P ConclusionPooling of tissue samples for analysis of species-specific DNA polymorphisms was an efficient, low-cost strategy for detecting hybrid genotypes among the offspring of pure-species parents, and a low rate of associated error was demonstrated. The inferred decline in inter-species pollen flow with increasing distance from the boundary between the two orchards provides guidance for the design of hybridising orchards and isolation requirements to prevent contamination of seed orchards by external pollen sources.

Item Type: Article
Authors/Creators:Le, S and Harwood, CE and Nghiem, CQ and Griffin, AR and Vaillancourt, RE
Keywords: Acacia, clonal seed orchard, contamination, hybrid seed, pollen dispersal, seed orchard design and management, seed production
Journal or Publication Title: Annals of Forest Science
Publisher: Springer-Verlag
ISSN: 1286-4560
DOI / ID Number: 10.1007/s13595-019-0823-1
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Copyright INRA and Springer-Verlag France SAS, part of Springer Nature 2019

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