期刊
EVOLUTION
卷 72, 期 6, 页码 1216-1224出版社
WILEY
DOI: 10.1111/evo.13501
关键词
B-chromosomes; drag; drive; invasion; neutralization
资金
- Spanish Ministerio de Economia y Competitividad [CGL2015-70750-P]
B chromosomes have been reported in about 15% of eukaryotes, but long-term dynamics of B chromosomes in a single natural population has rarely been analyzed. Prospero autumnale plants collected in 1981 and 1983 at Cuesta de La Palma population had shown the presence of B chromosomes. We analyze here seven additional samples collected between 1987 and 2015, and show that B frequency increased significantly during the 1980s and showed minor fluctuations between 2005 and 2015. A mother-offspring analysis of B chromosome transmission, at population level, showed significant drive on the male side (k(B)=0.65) and significant drag on the female side (k(B)=0.33), with average B transmission rate being very close to the Mendelian rate (0.5). No significant effects of B chromosomes were observed on a number of vigor and fertility-related traits. Within a parasite/host framework, these results suggest that B chromosomes' drive on the male side is the main pathway for B chromosome invasion, whereas B chromosome drag on the female side might be the main manifestation of host genome resistance in this species. Prospero autumnale thus illuminates a novel evolutionary pathway for B chromosome neutralization by means of a decrease in B transmission through the nondriving sex.
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