Pollen Contamination In Acacia Saligna:
Assessing The Risks For Sustainable Agroforestry
Author(s)
M. A. Millar & M. Byrne
Abstract
Species developed for sustainable agroforestry may pose risks to remnant
populations of closely related species via genetic contamination. Genetic
contamination and the production of hybrid progeny may threaten the health and
long-term viability of remnant populations. Acacia saligna is a native Western
Australian species complex selected for further development for agroforestry in
the agricultural areas of southern Australia. A. saligna shows great
morphological, ecological, biological and genetic variation, and will be
reclassified into a number of subspecies. This research aimed to develop genetic
markers and use them to assess the levels and distances of gene flow via pollen
dispersal between two of the proposed subspecies of Acacia saligna. Pollen
dispersal from the abundantly flowering subsp. saligna into the poorer flowering
subsp. lindleyi was high (32%). At the same site, pollen dispersal from subsp.
lindleyi into subsp. saligna was much lower (14%). Most genetic contamination
from subsp. saligna into subsp. lindleyi occurred at short distances (<300 m)
although inter-subspecific pollen dispersal was detected over large distances of
around 1600 m. The comparative levels of inter-subspecific pollen dispersal are
influenced by the relative floral fecundity of the different variants. The results
indicate that small remnant populations of subsp. lindleyi will be exposed to high
levels of hybridisation when subsp. saligna is planted nearby for agroforestry.
The effects of inter-subspecific hybridisation in A. saligna are unknown and until
further investigated it is recommended as a management guideline that isolation
distances of 1600 m or more be imposed between agroforestry plantings and
native populations.
Keywords: agroforestry, pollen dispersal, species complex, inter-subspecific
hybridisation, genetic contamination, microsatellites, paternity analysis, Acacia
saligna, risk assessment, isolation distances.
Keywords
agroforestry, pollen dispersal, species complex, inter-subspecific
hybridisation, genetic contamination, microsatellites, paternity analysis, Acacia
saligna, risk assessment, isolation distances.
Related Book
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