pollen tube
Definition
Noun (Botany): A slender, tubular structure that grows from a pollen grain after it lands on the stigma of a flower. Its function is to penetrate the flower's style and deliver the male gametes (sperm cells) to the ovule for fertilization.
Usage
The term is used specifically in the context of plant reproduction (botany) to describe the crucial structure that enables the transfer of male genetic material to the female ovule.
Examples
- After pollination, the pollen tube grows down through the style toward the ovary.
- The nucleus that will fertilize the egg cell travels within the pollen tube.
- Successful fertilization depends on the proper growth and guidance of the pollen tube.
Advanced Usage
- Pollen tube guidance: Refers to the complex biochemical signals that direct the pollen tube's growth toward the ovule.
- Pollen tube burst/rupture: Describes the event where the tip of the pollen tube opens to release the sperm cells upon reaching the ovule.
Variants and Related Words
- Pollen (n): The fine powder containing the male gametophytes of seed plants.
- Tube (n): A long, hollow cylinder. In this compound, it specifies the structure's shape.
- Pollen tube growth: A common phrase describing the process.
- Pollen tube nucleus: Refers to one of the nuclei contained within the growing tube.
Synonyms
- Male gametophyte extension (technical synonym, less common).
- Fertilization tube (descriptive synonym, occasionally used).
Related Phrases/Idioms
No common idioms or phrasal verbs are associated with this specific technical term.
Noun
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(botany) a slender tubular outgrowth from a pollen grain when deposited on the stigma for a flower; it penetrates the style and conveys the male gametes to the ovule
