Abstract
BackgroundChinese bayberry (Myrica rubra Sieb. & Zucc.) is an important subtropical evergreen fruit tree in southern China. Generally dioecious, the female plants are cultivated for fruit and have been studied extensively, but male plants have received very little attention. Knowledge of males may have a major impact on conservation and genetic improvement as well as on breeding. Using 84 polymorphic SSRs, we genotyped 213 M. rubra individuals (99 male individuals, 113 female varieties and 1 monoecious) and compared the difference in genetic diversity between the female and the male populations.ResultsNeighbour-joining cluster analysis separated M. rubra from three related species, and the male from female populations within M. rubra. By structure analysis, 178 M. rubra accessions were assigned to two subpopulations: Male dominated (98) and Female dominated (80). The well-known cultivars ‘Biqi’ and ‘Dongkui’, and the landraces ‘Fenhong’ are derived from three different gene pools. Female population had a slightly higher values of genetic diversity parameters (such as number of alleles and heterozygosity) than the male population, but not significantly different. The SSR loci ZJU062 and ZJU130 showed an empirical Fst value of 0.455 and 0.333, respectively, which are significantly above the 95 % confidence level, indicating that they are outlier loci related to sex separation.ConclusionThe male and female populations of Chinese bayberry have similar genetic diversity in terms of average number of alleles and level of heterozygosity, but were clearly separated by genetic structure analysis due to two markers associated with sex type, ZJU062 and ZJU130. Zhejiang Province China could be the centre of diversity of M. rubra in China, with wide genetic diversity coverage; and the two representative cultivars ‘Biqi’ and ‘Dongkui’, and one landrace ‘Fenhong’ in three female subpopulations. This research provides genetic information on male and female Chinese bayberry and will act as a reference for breeding programs.Electronic supplementary materialThe online version of this article (doi:10.1186/s12864-015-1602-5) contains supplementary material, which is available to authorized users.
Highlights
Chinese bayberry (Myrica rubra Sieb. & Zucc.) is an important subtropical evergreen fruit tree in southern China
Genetic diversity of the M. rubra accessions The 84 simple sequence repeat markers (SSRs) used in this research were polymorphic in both female and male samples, amplifying a total of 876 alleles, with an average of 10.43 alleles per locus. (Additional file 1: Table S1)
Low allele frequencies resulted in a reduced effective number of alleles (Ne, 3.71)
Summary
Chinese bayberry (Myrica rubra Sieb. & Zucc.) is an important subtropical evergreen fruit tree in southern China. Chinese bayberry (Myrica rubra) is an evergreen fruit tree native to southern China and other Asian countries [1]. The fruit has a delicious flavour and high nutritional value, especially rich in anthocyanins. It can be eaten as fresh fruit and as processed products, and has become popular in China and other countries in recent years [2,3,4]. Chinese bayberry (2n = 16) belongs to the Myricaceae family, is usually dioecious, is wind pollinated, and only a few individuals are monoecious. Other species in the Myricaceae family such as M. cerifera, M. faya and M. rivas-martinezii are dioecious plants [7,8,9], with unclear mechanism of sex determination.
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