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

Citation

Le, S and Harwood, CE and Nghiem, CQ and Griffin, AR and Vaillancourt, RE, Patterns of hybrid seed production in adjacent seed orchards of Acacia auriculiformis and A. mangium in Vietnam, Annals of Forest Science, 76 Article 46. ISSN 1286-4560 (2019) [Refereed Article]


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DOI: doi:10.1007/s13595-019-0823-1

Abstract

Abstract

Key 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.

Context

Understanding pollen dispersal has important implications for breeding and seed production of pure species and hybrid Acacia.

Aims

We examined patterns of hybrid production in adjacent clonal seed orchards of A. auriculiformis and A. mangium in Vietnam.

Methods

We 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.

Results

Hybrid frequency differed significantly among individual clones (P < 0.001) but not between species (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 < 0.001) with increasing distance, and no hybrid seed was produced by trees located more than 116 m from the inter-orchard boundary.

Conclusion

Pooling 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 Details

Item Type:Refereed Article
Keywords:Acacia, clonal seed orchard, contamination, hybrid seed, pollen dispersal, seed orchard design and management, seed production
Research Division:Agricultural and Veterinary Sciences
Research Group:Forestry Sciences
Research Field:Tree Improvement (Selection and Breeding)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood Plantations
UTAS Author:Le, S (Mr Son Le)
UTAS Author:Harwood, CE (Mr Christopher Harwood)
UTAS Author:Griffin, AR (Professor Rod Griffin)
UTAS Author:Vaillancourt, RE (Professor Rene Vaillancourt)
ID Code:136197
Year Published:2019
Deposited By:Plant Science
Deposited On:2019-12-05
Last Modified:2019-12-11
Downloads:0

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