Breeding systems in Angiosperms: novel inferences from a new analytical approach

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• 作者：Nelson Ramírez ; Jafet M. Nassar
• 关键词：Agamospermy ; Breeding system index ; Inbreeding depression ; Natural reproductive efficiency ; Outbreeding depression ; Self ; incompatibility
• 刊名：Plant Systematics and Evolution
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：303
• 期：2
• 页码：119-137
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Plant Sciences; Plant Ecology; Plant Anatomy/Development; Plant Systematics/Taxonomy/Biogeography;
• 出版者：Springer Vienna
• ISSN：2199-6881
• 卷排序：303

文摘

A novel analytical approach to classify breeding systems in Angiosperms combining statistical and conceptual criteria is proposed, which will allow to describe and compare available mating system data in an unified form. Four breeding system indexes (BSI) were combined: Index of Agamospermy, Index of Spontaneous Self-Pollination (ISSP), Index of Self-Fertility (ISF), and Index of Self-incompatibility. Their values, ranging from 0 to ∞, were analyzed using t tests to discriminate experimental breeding index values from 0 and 1.0. For each index, five discrete categories were described. The composite of the four BSI assigned to a species represents an integrated characterization of its reproductive system. A magnitude measure (M) describes the strength of each BSI assigned to a species. Indexes of inbreeding and outbreeding depression were also examined for each species. Published data from 1908 taxa were used to determine composite breeding systems. Frequencies of breeding index categories across the four BSI for the entire data set were determined. Non-agamospermous species dominated. Non-spontaneous self-pollinating and xenogamous species were the most frequent categories observed for ISSP and ISF indexes, respectively. The largest group of species examined was partially self-incompatible. Actual number of composite breeding systems inferred based on our analysis represents a small fraction (8.9 %) of all mathematically possible ones. Similarly, the observed combinations between results obtained from the four pollination tests and estimates of natural reproductive efficiency were only 22.1 % of all mathematically possible combinations. Within Angiosperms, there is a marked trend toward evolution of partial self-incompatibility with significant inbreeding depression.