extine

简明释义

英[ˈekstɪn]美[ˈekstaɪn]

n. [植] 花粉粒外壁；[植] 孢子外壁

英英释义

单词用法

同义词

反义词

例句

1.The angle between pinhead and dispensing surface is adjustable, which enables dispensing onto inwall, extine, "L" vertical plane of workpieces.

针头与点胶面可调角度，使胶水能点涂到工件内外壁或“L”型垂直空间内；

2.The angle between pinhead and dispensing surface is adjustable, which enables dispensing onto inwall, extine, "L" vertical plane of workpieces.

针头与点胶面可调角度，使胶水能点涂到工件内外壁或“L”型垂直空间内；

3.An extine with its specific pattern had already been formed, when microspores were released from tetrads.

当小孢子从四分体中释放出来，特殊类型的外壁已经形成。

4.The outer layer of the pollen grain is called the extine, which provides protection.

花粉粒的外层被称为extine，它提供保护。

5.Researchers studied the structure of the extine to understand its role in plant reproduction.

研究人员研究了extine的结构，以了解它在植物繁殖中的作用。

6.In some species, the extine has unique patterns that aid in identification.

在某些物种中，extine具有独特的图案，有助于识别。

7.The extine can vary significantly between different types of pollen.

extine在不同类型的花粉之间可能有显著差异。

8.During the examination of spores, the extine was found to be thicker in certain environments.

在孢子的检查中发现，在某些环境中，extine更厚。

作文

In the world of botany, understanding the structure and function of plant cells is essential for grasping how plants grow and reproduce. One of the critical components of a plant's reproductive process is the pollen grain, which plays a vital role in fertilization. Within the pollen grain, there are several layers, but one of the most important is the outer layer known as the extine. The extine is the tough, protective outer layer of the pollen wall that provides structural integrity and protects the inner contents from environmental factors. This layer is primarily composed of sporopollenin, a complex biopolymer that is resistant to degradation, making it crucial for the survival of pollen grains in various conditions. The extine serves multiple functions. Firstly, it protects the pollen grain from desiccation, which is vital for its viability. Pollen grains can be exposed to harsh environmental conditions, including extreme temperatures and varying humidity levels. The robust nature of the extine ensures that the delicate genetic material inside remains intact until it reaches a suitable environment for germination. Secondly, the extine plays a role in the recognition processes during pollination. Different species of plants have unique patterns and textures on their extine, which can attract specific pollinators. For example, certain flowers may produce pollen with a rough extine to adhere better to the bodies of insects, facilitating the transfer of pollen from one flower to another. This interaction is crucial for cross-pollination, which enhances genetic diversity within plant populations. Moreover, the study of the extine has significant implications in agriculture and horticulture. Understanding the characteristics of the extine can help scientists develop better strategies for crop pollination, leading to improved yields and more resilient plant varieties. For instance, by manipulating the properties of the extine, researchers can create pollen that is more attractive to beneficial insects or that can withstand adverse environmental conditions, thereby enhancing the efficiency of pollination. In conclusion, the extine is not just a simple outer layer of pollen grains; it is a sophisticated structure that plays a vital role in the reproductive success of plants. Its protective qualities, involvement in pollinator attraction, and significance in agricultural practices make it an essential topic of study in botany. As we continue to explore the intricate details of plant biology, the extine will undoubtedly remain a focal point for understanding plant reproduction and the ecological relationships that sustain our environment.

在植物学的世界中，理解植物细胞的结构和功能对于掌握植物的生长和繁殖至关重要。花粉粒是植物繁殖过程中一个关键的组成部分，在授粉中起着重要作用。在花粉粒中，有几个层次，但最重要的是被称为外层的外层。外层是花粉壁的坚韧保护外层，提供结构完整性，并保护内部内容物免受环境因素的影响。这个层主要由孢子素组成，这是一种复杂的生物聚合物，耐降解，使其在各种条件下对花粉粒的生存至关重要。 外层具有多重功能。首先，它保护花粉粒免受干燥，这对其生存能力至关重要。花粉粒可能暴露于恶劣的环境条件中，包括极端温度和变化的湿度水平。坚固的外层确保内部的精细遗传物质保持完整，直到它达到适合发芽的环境。 其次，外层在授粉过程中的识别过程中也发挥作用。不同种类植物的外层具有独特的图案和纹理，可以吸引特定的授粉者。例如，某些花朵可能产生具有粗糙外层的花粉，以更好地附着在昆虫的身体上，促进花粉从一朵花转移到另一朵花。这种相互作用对于异花授粉至关重要，可以增强植物种群的遗传多样性。 此外，研究外层在农业和园艺中具有重要意义。了解外层的特征可以帮助科学家制定更好的作物授粉策略，从而提高产量和更具韧性的植物品种。例如，通过操控外层的性质，研究人员可以创造出更能吸引有益昆虫或能够抵御不利环境条件的花粉，从而提高授粉效率。 总之，外层不仅仅是花粉粒的简单外层；它是一个复杂的结构，在植物的繁殖成功中发挥着至关重要的作用。它的保护特性、参与授粉者吸引的作用以及在农业实践中的重要性使其成为植物学研究的一个重要主题。随着我们继续探索植物生物学的复杂细节，外层无疑将继续成为理解植物繁殖和维持我们环境的生态关系的重点。