Journal
TREE GENETICS & GENOMES
Volume 15, Issue 2, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11295-019-1336-7
Keywords
Paternity; Microsatellites; Macadamia; Self-fertilisation
Categories
Funding
- Hort Innovation project [MC15008]
- Hort Innovation
- Knappick Foundation
- Australian Macadamia Society
- Macadamia Conservation Trust
- Southern Cross University
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The recently domesticated nut crop macadamia is partially self-incompatible. Variation in the capacity for self-fertilisation is likely to have significant consequences, both for commercial nut production and the conservation of native populations. Molecular paternity testing using 11 microsatellite markers was conducted on open-pollinated seedling progeny of cultivar 741', and mature kernel from eight different cultivars, seven of which have been used in previous self- and cross-pollination studies. The study was based in a varietal trial plot containing 40 different cultivars. Paternity was assigned to 92% of seedlings and 87% of kernel assessed. For four cultivars, selfing rates of 20-40% were detected. Estimates of relatedness between cultivars indicate a first-degree relationship between the two most widely grown cultivars in Australia, 741' and 344', at the level of full-sib or parent-offspring. Insight into the breeding system of macadamia is likely to have major implications for landscape and orchard-scale management. Our results point to significant differences in the capacity for self-fertilisation between cultivars and provide new molecular evidence of pollen flow under orchard conditions.
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