| 释义 |
Definition of dichogamy in English: dichogamynoun dʌɪˈkɒɡəmidīˈkäɡəmē mass nounBotany The ripening of the stamens and pistils of a flower at different times, so that self-fertilization is prevented. Compare with homogamy (sense 3) Example sentencesExamples - This suggests that weak dichogamy occurs in this species unless stigma maturation is delayed by the retention of self-pollen.
- Flowering plants have several mechanisms that have evolved to prevent self-fertilization, e.g. self-incompatibility systems, heterostyly and dichogamy.
- However, the form of dichogamy (protogyny and protandry) is likely to have different consequences for autogamy versus geitonogamy.
- Although dichogamy is considered an important factor influencing gender expression, its roles in promoting the evolution of gender specialization are still poorly understood.
- However, if flowering is asynchronous and the behaviour of individual pollinators does not follow a regular pattern within a plant, dichogamy might have little effect on reducing geitonogamy.
Derivatives adjective Botany Flowers are unisexual, dichogamous in nature and, thus, most species are open-pollinated. Example sentencesExamples - This is despite a large, showy floral display and the dichogamous system of the species.
- The breeding system of the dichogamous hermaphrodite species Silene acutifolia, endemic to north-west Spain and north and central Portugal, is examined.
- Darwin deduced that the first flowers to open sometimes aborted because they were of no use in dichogamous hermaphrodite plants.
Origin Mid 19th century: from Greek dikho- 'apart, in two' + gamos 'marriage'. Definition of dichogamy in US English: dichogamynoundīˈkäɡəmē Botany The ripening of the stamens and pistils of a flower at different times, so that self-fertilization is prevented. Compare with homogamy (sense 3) Example sentencesExamples - Flowering plants have several mechanisms that have evolved to prevent self-fertilization, e.g. self-incompatibility systems, heterostyly and dichogamy.
- However, if flowering is asynchronous and the behaviour of individual pollinators does not follow a regular pattern within a plant, dichogamy might have little effect on reducing geitonogamy.
- Although dichogamy is considered an important factor influencing gender expression, its roles in promoting the evolution of gender specialization are still poorly understood.
- However, the form of dichogamy (protogyny and protandry) is likely to have different consequences for autogamy versus geitonogamy.
- This suggests that weak dichogamy occurs in this species unless stigma maturation is delayed by the retention of self-pollen.
Origin Mid 19th century: from Greek dikho- ‘apart, in two’ + gamos ‘marriage’. |