protonema

简明释义

英[ˌprəʊtəˈniːmə]美[ˌprotəˈnimə]

n. 丝状体；[植] 原丝体

复 数 p r o t o n e m a t a

英英释义

单词用法

同义词

反义词

例句

1.The production of massive protonema immediately follows and then caulonema, chloronema and secondary rhizoides.

块状原丝体的产生紧随其后，其次是茎丝体、绿线体和次生根丝体。

2.The production of massive protonema immediately follows and then caulonema, chloronema and secondary rhizoides.

块状原丝体的产生紧随其后，其次是茎丝体、绿线体和次生根丝体。

3.During the study, we noted that the protonema could regenerate even after being damaged.

在研究中，我们注意到即使在受损后，原丝体也能再生。

4.The early stages of moss development begin with the formation of a protonema, which is the thread-like structure that grows from the spores.

苔藓发育的早期阶段始于形成原丝体，这是从孢子生长出的丝状结构。

5.In laboratory experiments, scientists studied the growth rate of protonema under different light conditions.

在实验室实验中，科学家研究了在不同光照条件下原丝体的生长速率。

6.Researchers observed that the protonema can absorb water and nutrients effectively, aiding in the survival of moss in dry conditions.

研究人员观察到，原丝体能够有效吸收水分和养分，帮助苔藓在干燥条件下生存。

7.The protonema serves as a crucial stage for the transition from spore to mature moss plant.

原丝体是从孢子转变为成熟苔藓植物的重要阶段。

作文

In the fascinating world of botany, the life cycle of mosses is a subject that captivates many scientists and nature enthusiasts alike. One of the most intriguing stages in this life cycle is the formation of the protonema. The protonema (原丝体) is the initial stage of growth in mosses, emerging from the germination of the moss spores. This filamentous structure plays a crucial role in the development of the mature gametophyte, which is the dominant stage in the life cycle of mosses.When a moss spore lands in a suitable environment, it absorbs water and begins to germinate. The first structure that forms is the protonema, which consists of a network of thread-like filaments. These filaments are typically green due to the presence of chlorophyll, allowing them to perform photosynthesis. The protonema serves not only as a source of energy for the growing moss but also as a means of anchoring the plant to the substrate.As the protonema develops, it can produce various structures, including buds that will eventually grow into the leafy shoots of the mature moss. This transition from protonema to gametophyte is an essential part of the moss's life cycle and highlights the remarkable adaptability of these plants. Mosses are known for their resilience and ability to thrive in diverse environments, from damp forests to rocky surfaces, and the protonema stage is critical for establishing themselves in such habitats.The ecological significance of the protonema extends beyond individual moss plants. Mosses play a vital role in their ecosystems, contributing to soil formation, moisture retention, and providing habitat for various microorganisms. The protonema helps in these processes by stabilizing the soil and creating a microhabitat that supports other forms of life.Moreover, studying the protonema can provide insights into evolutionary biology. The simple structure of the protonema reflects the ancient lineage of mosses, which are among the earliest land plants. Understanding how the protonema functions and evolves can help scientists make connections between different plant groups and their adaptations to terrestrial life.In conclusion, the protonema (原丝体) is a fundamental component of the moss life cycle, representing the beginning of growth and development. Its role in photosynthesis, anchoring, and contributing to the ecosystem underscores the importance of this seemingly simple structure. As we continue to explore the complexities of plant biology, the protonema remains a key area of interest, revealing the intricate relationships between plants and their environments. Through further research, we can appreciate not only the beauty of mosses but also their critical role in sustaining ecosystems across the globe.