perisperm

简明释义

英[ˈperɪˌspɜːm]美[ˈperɪˌspəm]

外胚乳

英英释义

单词用法

同义词

反义词

例句

1.Plenty of starch grains present in perisperm cells.

壁呈波浪形的外胚乳细胞富含淀粉粒。

2.Cells of perisperm contain mainly lipids, a small amount of protein granulars but no starch grain.

外胚乳细胞主要含许多脂类物质及少量蛋白质颗粒，不含淀粉。

3.Cells of perisperm contain mainly lipids, a small amount of protein granulars but no starch grain.

外胚乳细胞主要含许多脂类物质及少量蛋白质颗粒，不含淀粉。

4.Researchers are studying the role of perisperm in seed viability.

研究人员正在研究外胚层在种子活力中的作用。

5.The perisperm can vary in texture and composition depending on the plant species.

外胚层的质地和成分可能因植物种类而异。

6.The perisperm is often overlooked in discussions about seed anatomy.

在关于种子解剖的讨论中，外胚层常常被忽视。

7.The seed's perisperm provides essential nutrients during germination.

种子的外胚层在发芽过程中提供必要的营养。

8.In some plants, the perisperm acts as a food reserve for the developing embryo.

在某些植物中，外胚层作为发育胚胎的食物储备。

作文

The world of botany is filled with fascinating terms that describe the intricate processes and structures found in plants. One such term is perisperm, which refers to the tissue surrounding the embryo within the seed of certain plants. It plays a crucial role in seed development and nutrition, particularly in the early stages of germination. Understanding the function and significance of perisperm can provide insights into plant biology and the evolution of seed structures.In many flowering plants, seeds are formed after fertilization, where the ovule develops into a seed containing the embryo. The perisperm serves as a nutritive tissue that provides essential nutrients to the developing embryo during its initial growth phase. Unlike endosperm, which is more commonly known and found in most angiosperms, perisperm is derived from the nucellus, the tissue that surrounds the ovule before fertilization. This distinction highlights the diverse strategies plants have evolved for nurturing their offspring.The presence of perisperm is particularly notable in certain families of plants, such as the Piperaceae and some species of the Orchidaceae family. In these plants, the perisperm can vary significantly in its composition and structure, adapting to the specific needs of the plant species. For instance, in some orchids, the perisperm may be rich in starches, providing a quick energy source for the germinating seedling, while in others, it may contain oils or proteins that serve different nutritional purposes.The study of perisperm not only enhances our understanding of plant development but also has practical implications in agriculture and horticulture. By knowing how different plants utilize their perisperm, horticulturists can make informed decisions about seed selection and cultivation practices. For example, seeds with a well-developed perisperm may have higher germination rates and better survival chances under various environmental conditions. This knowledge can be particularly beneficial in efforts to conserve endangered plant species or improve crop yields in food production.Moreover, the evolutionary significance of perisperm cannot be overlooked. As plants have adapted to diverse environments, the development of perisperm in certain lineages suggests a successful strategy for survival and reproduction. By utilizing the resources available in their immediate environment, plants can optimize their reproductive success, ensuring that their genetic material is passed on to future generations.In conclusion, the term perisperm encapsulates an important aspect of plant biology that is often overlooked. By studying this unique tissue, we can gain a deeper appreciation for the complexities of plant life and the various adaptations that have allowed them to thrive in different habitats. Whether you are a botanist, a gardener, or simply someone interested in the natural world, understanding perisperm opens up a new realm of knowledge about how plants grow, develop, and interact with their environment. As we continue to explore the wonders of botany, terms like perisperm remind us of the intricate connections that exist within the plant kingdom and the importance of preserving these remarkable organisms for future generations.

植物学的世界充满了迷人的术语，这些术语描述了植物中复杂的过程和结构。其中一个术语是perisperm，它指的是某些植物种子中包围胚胎的组织。它在种子发育和营养中发挥着至关重要的作用，特别是在萌发的早期阶段。理解perisperm的功能和重要性可以提供对植物生物学和种子结构演化的深入见解。在许多开花植物中，种子是在受精后形成的，胚珠发育成含有胚胎的种子。perisperm作为一种营养组织，为正在发育的胚胎在其初始生长阶段提供必需的营养。与更常见的内胚乳不同，内胚乳在大多数被子植物中存在，而perisperm则源于胚珠周围的核组织，这是在受精前的组织。这一区别突显了植物为养育后代而进化出的多样策略。perisperm的存在在某些植物科中尤为显著，例如胡椒科和某些兰科植物。在这些植物中，perisperm的组成和结构可能会显著不同，以适应特定植物种的需求。例如，在某些兰花中，perisperm可能富含淀粉，为萌发的幼苗提供快速的能量来源，而在其他兰花中，它可能含有油脂或蛋白质，具有不同的营养用途。对perisperm的研究不仅增强了我们对植物发育的理解，而且在农业和园艺中也具有实际意义。通过了解不同植物如何利用其perisperm，园艺师可以就种子选择和栽培实践做出明智的决定。例如，具有良好发育的perisperm的种子可能具有更高的发芽率和在各种环境条件下更好的生存机会。这一知识在保护濒危植物种或提高粮食生产作物产量的努力中尤为重要。此外，perisperm的进化意义也不容忽视。当植物适应多样的环境时，某些谱系中perisperm的发展表明了一种成功的生存和繁殖策略。通过利用其直接环境中的资源，植物可以优化其繁殖成功，确保其遗传物质传递给未来的世代。总之，术语perisperm概括了植物生物学中一个重要而常被忽视的方面。通过研究这一独特的组织，我们可以更深入地欣赏植物生命的复杂性以及使它们能够在不同栖息地中茁壮成长的各种适应性。无论你是植物学家、园丁，还是仅仅对自然界感兴趣的人，理解perisperm都为我们打开了一个新的知识领域，关于植物如何生长、发育以及与环境相互作用。随着我们继续探索植物学的奇迹，像perisperm这样的术语提醒我们植物王国内部存在的复杂联系，以及保护这些非凡生物以供未来世代的重要性。