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词汇 gametophyte
释义

Definition of gametophyte in English:

gametophyte

noun ɡəˈmiːtə(ʊ)fʌɪtɡəˈmidəˌfaɪt
Botany
  • (in the life cycle of plants with alternating generations) the gamete-producing and usually haploid phase, producing the zygote from which the sporophyte arises. It is the dominant form in bryophytes.

    〔植〕配子体

    Example sentencesExamples
    • Many algae are characterized by an alternation of haploid gametophyte and diploid sporophyte generations.
    • Bryophytes are characterized by their dominant gametophytic plant body and their sporophytes epiphytic to gametophytes.
    • The alternation between haploid gametophyte and diploid sporophyte phases, known as alternation of generations, occurs in all multi-cellular plants.
    • Unlike vascular plants, the haploid gametophyte generation is dominant in mosses.
    • The plant life cycle alternates between a diploid sporophyte and a haploid gametophyte generation.

Derivatives

  • gametophytic

  • adjectiveɡəmiːtə(ʊ)ˈfɪtɪk
    Botany
    • The pollen grain is the male gametophytic phase of flowering plants.
      Example sentencesExamples
      • Seed development requires co-ordinated expression of embryo and endosperm and is controlled by sporophytic, male gametophytic, and female gametophytic genes.
      • In both species there are several layers of cells with labyrinthine walls (transfer cells) on both the sporophytic and gametophytic side of the placenta.
      • Individual specimens were identified to the generic level from the morphology of the young sporophytes and the presence or absence of gametophytic trichomes.
      • In barley, a combination of starvation and osmotic stress is able to induce efficiently a microspore developmental switch from the gametophytic to the sporophytic pathway, a process called androgenesis.

Definition of gametophyte in US English:

gametophyte

nounɡəˈmēdəˌfītɡəˈmidəˌfaɪt
Botany
  • (in the life cycle of plants with alternating generations) the gamete-producing and usually haploid phase, producing the zygote from which the sporophyte arises. It is the dominant form in bryophytes.

    〔植〕配子体

    Example sentencesExamples
    • Unlike vascular plants, the haploid gametophyte generation is dominant in mosses.
    • Many algae are characterized by an alternation of haploid gametophyte and diploid sporophyte generations.
    • The plant life cycle alternates between a diploid sporophyte and a haploid gametophyte generation.
    • The alternation between haploid gametophyte and diploid sporophyte phases, known as alternation of generations, occurs in all multi-cellular plants.
    • Bryophytes are characterized by their dominant gametophytic plant body and their sporophytes epiphytic to gametophytes.
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