
A review of delayed autonomous selfing in flowering plants
XIAO Hanwen, LIU Qingshan, TIAN Runan
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (6) : 233-239.
A review of delayed autonomous selfing in flowering plants
Delayed autonomous self-pollination or delayed selfing is a reproductive way of autonomous self-pollination that occurs at the end of cross-pollination of a single flower in flowering plants. To complement the comprehensive data base of plant evolution and pollination biology, we provide a review of progress in the occurrence pathways, experimental research methods, and the “best of both worlds” reproductive assurance hypothesis of delayed selfing. We also discuss the adaptive significance of delayed selfing and suggest future research directions. The delayed selfing is present in 74 angiosperm species, and widely distributed in 61 genera and 43 families, of which 52 species occur by a single pathway and 22 species by two pathways. In a single pathway, the style curvature is the most common to cause the delayed selfing. Incomplete dichogamy and reduced herkogamy are the most common pathways promoting the delayed selfing occurrence. Observations of delayed selfing have mostly been done through pollination biology, and few studies have combined pollination biology with genetics to provide the most rigorous evidence for the occurrence of delayed selfing. The reproductive assurance hypothesis of delayed selfing suggests that it prioritizes securing cross-pollination and can aid in the reproductive success of plants when the pollination environment is unpredictable. Therefore, the delayed selfing is considered the “best of both worlds” mating system that combines the advantages of selfing and outcrossing. In addition, for ovule-less species, plants have sufficient prior pollination and fertilization after a single visit by insects, which also prevents the occurrence of delayed selfing to save plant resources for other purposes.
flowering plant / delayed autonomous selfing / reproductive assurance / inbreeding depression / adaptation mechanism
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上海辰山植物园魏宇昆博士和黄艳波工程师在前期锦葵科和唇形科延迟自交发生机制和繁殖保障研究中给予指导!
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