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Variation in the degree of reciprocal herkogamy affects the degree of legitimate pollination in a distylous species
Jiang, Xian-Feng; Zhu, Xing-Fu; Li, Qing-Jun
2018
Source PublicationAOB PLANTS
ISSN2041-2851
Volume10Issue:3Pages:-
AbstractDistyly is a widespread floral polymorphism characterized by the flowers within a population showing reciprocal placement of the anthers and stigma. Darwin hypothesizes that distyly evolves to promote precise pollen transfer between morphs. Primula chungensis exhibits two types of anther heights, and these two types of anthers show pollen of two different size classes. To understand whether the stigma could capture more pollen grains from the anthers of the pollen donor as the separation between the stigma of pollen receiver and the anther of pollen donor decreased, the present research assessed the source of the pollen load in a series of open-pollinated flowers with continuous variation of style lengths. Individuals with continuous variation of style length were tagged, and the selected flowers in the tagged plants were emasculated the day before dehiscence. The stigma of the emasculated flowers was fixed in fuchsin gel at the end of blooming. We assessed the pollen sources on each stigma by taking photos under a microscope and measured the diameter of each conspecific pollen grain with ImageJ. We found that a shorter distance from the stigmas to the anthers of a pollen donor gave the flower a higher capacity to receive pollen from those anthers. Our result provides a new evidence that distyly could promote the pollen transfer between morphs, which is consistent with Darwin's hypothesis of disassortative pollination. An alternative hypothesis for the evolution of distyly (e.g. selfing avoidance) might also be true, but less likely, because self-incompatibility would greatly avoid self-fertilization for many distylous species.
Department其他
KeywordDisassortative Pollination Hypothesis Distyly Homostyly Pollen Deposition Primula Chungensis Reciprocal Herkogamy
Subject AreaPlant Sciences ; Environmental Sciences & Ecology
Language英语
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/10984
Collection植物进化生态研究组
Recommended Citation
GB/T 7714
Jiang, Xian-Feng,Zhu, Xing-Fu,Li, Qing-Jun. Variation in the degree of reciprocal herkogamy affects the degree of legitimate pollination in a distylous species[J]. AOB PLANTS,2018,10(3):-.
APA Jiang, Xian-Feng,Zhu, Xing-Fu,&Li, Qing-Jun.(2018).Variation in the degree of reciprocal herkogamy affects the degree of legitimate pollination in a distylous species.AOB PLANTS,10(3),-.
MLA Jiang, Xian-Feng,et al."Variation in the degree of reciprocal herkogamy affects the degree of legitimate pollination in a distylous species".AOB PLANTS 10.3(2018):-.
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