Wellington Christopher N, Vaillancourt René E, Potts Brad M, Worledge Dale, O'Grady Anthony P
School of Biological Sciences, University of Tasmania, Hobart, TAS 7005, Australia.
CSIRO Land and Water, Hobart, TAS 7001, Australia.
Plants (Basel). 2022 Apr 10;11(8):1029. doi: 10.3390/plants11081029.
is emerging as an economically important plant for the commercial production of mānuka honey and essential oils, both exhibiting unique antibacterial attributes. To support its domestication this is the first quantitative genetic study of variation for traits. It utilised plants from 200 open-pollinated families derived from 40 native populations, from across the species range in Tasmania, grown in a common garden field trial. The traits studied were survival, growth, and the flowering traits precocity, the timing of seasonal peak flowering, flowering duration, and flowering intensity. Significant genetic variation was evident at the population level for all traits studied and at the family level for three traits-growth, flowering precocity, and time to peak flowering. These three traits had moderate to high narrow-sense heritability estimates ranging from 0.27 to 0.69. For six of the traits studied, population differences were associated with climate attributes at the locations where seed was collected, suggesting adaptation to the local climate may have contributed to the observed population differentiation. Population level geographical trends suggest that genotypes to focus on for domestication originate from the eastern half of Tasmania for precociousness and the western half of Tasmania for earlier time to peak flowering and extended flowering duration.
作为一种具有经济重要性的植物，麦卢卡正在商业化生产麦卢卡蜂蜜和精油，这两种产品都具有独特的抗菌特性。为了支持其驯化，这是首次对性状变异进行的定量遗传研究。它利用了来自塔斯马尼亚岛整个物种分布范围内40个本地种群的200个开放授粉家系的植物，在一个普通园田试验中种植。所研究的性状包括存活率、生长情况以及开花性状早熟性、季节性开花高峰时间、开花持续时间和开花强度。在所研究的所有性状的种群水平以及生长、开花早熟性和开花高峰时间这三个性状的家系水平上，都存在显著的遗传变异。这三个性状的狭义遗传力估计值为中等至高，范围从0.27到0.69。在所研究的六个性状中，种群差异与采集种子地点的气候属性相关，这表明对当地气候的适应可能促成了观察到的种群分化。种群水平的地理趋势表明，驯化时应关注的基因型，早熟性方面源自塔斯马尼亚岛东半部，而较早达到开花高峰时间和较长开花持续时间方面源自塔斯马尼亚岛西半部。
