Pollen precedence and stigma closure a mechanism of competition for pollination between delphinium nelsonii and ipomopsis aggregata

作者: Nickolas M. Waser , Michael L. Fugate

DOI: 10.1007/BF00379906

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摘要: Previous experiments showed that the sympatric herbs Delphinium nelsonii and Ipomopsis aggregata compete for hummingbird pollination deleterious effects of former species on seed set latter involve interspecific pollen transfer. However, was not reduced when both applied simultaneously to I. stigmas. Hence a competitive effect may require arrival foreign before conspecific pollen. To explore this possibility we subjected flowers “competition” treatment in which they received D. 6 h pollen, or “control” only Foreign precedence decreased mean by almost 50%, is consistent with observed previous experiments. Reduced can be explained fact often caused stigma lobes close together within 1.5–6 h, reducing subsequent receptivity. Stigma closure also elicited but mechanical stimulation, influenced size load identity plant being pollinated.

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