calyptra

简明释义

英[kəˈlɪptrə]美[kəˈlɪptrə]

n. 藓帽；根冠

英英释义

单词用法

同义词

反义词

例句

1.While within the high concentration selenium, the reducing strength and the rate of calyptra of roots decreases, so does the bio-production of roots.

而高质量浓度的硒处理根系的还原活力降低、根冠比下降、根系的生物量减少。

2.While within the high concentration selenium, the reducing strength and the rate of calyptra of roots decreases, so does the bio-production of roots.

而高质量浓度的硒处理根系的还原活力降低、根冠比下降、根系的生物量减少。

3.The moss's calyptra 盖膜 protects the developing capsule from desiccation.

苔藓的calyptra 盖膜 保护着发育中的囊果免受干燥。

4.During our biology lab, we observed the calyptra 盖膜 of the liverwort under a microscope.

在我们的生物实验室中，我们在显微镜下观察了肝苔的calyptra 盖膜。

5.The calyptra 盖膜 plays a crucial role in the reproductive cycle of many bryophytes.

在许多苔藓植物的繁殖周期中，calyptra 盖膜 起着至关重要的作用。

6.When the calyptra 盖膜 falls off, it indicates that the spore capsule is ready to release spores.

当calyptra 盖膜 脱落时，这表明孢子囊已经准备好释放孢子。

7.In some species, the calyptra 盖膜 can be quite elaborate and colorful.

在某些物种中，calyptra 盖膜 可以非常复杂且色彩斑斓。

作文

In the world of botany, there are many fascinating structures that play crucial roles in the life cycle of plants. One such structure is the calyptra, which serves as a protective covering for the developing sporophyte in mosses and liverworts. Understanding the function and importance of the calyptra can provide insights into the complex processes of plant reproduction and development. The calyptra is typically formed from the tissue of the gametophyte, the dominant stage in the life cycle of bryophytes. This structure envelops the sporangium, which is responsible for producing spores. As the sporophyte matures, the calyptra eventually falls away, allowing the spores to be released into the environment. This release is vital for the propagation of the species, as the spores will germinate and develop into new gametophytes, continuing the cycle of life. One interesting aspect of the calyptra is its role in protecting the delicate sporangium from environmental stressors. During the early stages of development, the sporophyte is particularly vulnerable to desiccation and physical damage. The calyptra acts as a shield, keeping moisture in and safeguarding the sporangium from harsh weather conditions. This protective function is crucial, especially in habitats where mosses and liverworts often thrive, such as damp forests or shaded areas. Moreover, the calyptra is not just a passive structure; it also participates in the regulation of spore release. In some species, the calyptra may influence the timing of spore dispersal based on environmental cues, ensuring that spores are released at the most favorable times for germination. This adaptive strategy highlights the intricate relationship between plant structures and their environments, showcasing how evolution has fine-tuned these mechanisms for survival. The study of the calyptra extends beyond mosses and liverworts. Researchers have drawn parallels between this structure and other protective coverings found in different plant groups. For instance, the concept of a protective layer can also be seen in flowering plants, where various parts of the flower serve to protect reproductive organs. By examining the similarities and differences across plant taxa, scientists can gain a better understanding of evolutionary processes and the diversification of plant forms. In conclusion, the calyptra is a remarkable example of nature's ingenuity. Its protective and regulatory functions are essential for the successful reproduction of bryophytes. By studying the calyptra, we not only learn about the specific adaptations of mosses and liverworts but also gain broader insights into plant biology and evolution. The more we uncover about such structures, the more we appreciate the complexity and beauty of the natural world around us.

在植物学的世界中，有许多迷人的结构在植物生命周期中发挥着至关重要的作用。其中一个结构是calyptra，它作为苔藓和肝苔的发育孢子体的保护覆盖。理解calyptra的功能和重要性可以提供关于植物繁殖和发育复杂过程的见解。 calyptra通常由配子体的组织形成，这是苔藓植物生命周期中的主导阶段。这个结构包裹着孢子囊，负责产生孢子。随着孢子体的成熟，calyptra最终脱落，使孢子释放到环境中。这种释放对于物种的传播至关重要，因为孢子将萌发并发展成新的配子体，继续生命的循环。 calyptra的一个有趣方面是它在保护脆弱孢子囊免受环境压力中的作用。在发育的早期阶段，孢子体特别容易受到干燥和物理损伤。calyptra充当了一个屏障，保持水分并保护孢子囊免受恶劣天气条件的影响。这种保护功能至关重要，尤其是在苔藓和肝苔常常繁茂的栖息地，如潮湿的森林或阴暗的区域。 此外，calyptra不仅是一个被动结构；它还参与调节孢子的释放。在某些物种中，calyptra可能根据环境线索影响孢子释放的时机，确保孢子在最有利于萌发的时间释放。这种适应性策略突显了植物结构与其环境之间的复杂关系，展示了进化如何精细调整这些生存机制。 对calyptra的研究超越了苔藓和肝苔。研究人员在不同植物群体中找到了这一结构与其他保护覆盖物之间的相似之处。例如，在开花植物中，花的各个部分也起到保护生殖器官的作用。通过考察植物类群之间的相似性和差异性，科学家们可以更好地理解进化过程和植物形态的多样化。 总之，calyptra是自然聪明才智的一个显著例子。它的保护和调节功能对于苔藓植物的成功繁殖至关重要。通过研究calyptra，我们不仅了解苔藓和肝苔的特定适应性，还获得了更广泛的植物生物学和进化的见解。我们对这些结构的了解越深入，就越能欣赏周围自然世界的复杂性和美丽。