cotyledons

简明释义

英[ˈkɒtɪliːdənz]美[ˈkɑːtɪlidnz]

n. [植]子叶（cotyledon 的复数）

英英释义

单词用法

同义词

反义词

例句

1.The regeneration system of melon was achieved. Cotyledons were used as explants.

优化了新疆厚皮甜瓜皇后的组织培养再生体系。

2.The method of tissue culture is used to induce the cotyledons of cucumis melon to become callus and then adventitious buds.

用组织培养的方法使甜瓜子叶脱分化形成愈伤组织，继而在分化培养基上形成不定芽。

3.The placenta should be examined for missing cotyledons or blind vessels.

检查胎盘是否有小叶残余或断裂的血管。

4.The embryo consists of two large fleshy cotyledons.

胚有两片大而肉质的子叶。

5.Sakers and aspirators separate the hull from the cracked cotyledons and rollers flake them .

皮壳与破碎的豆瓣，通过振动筛和吸壳器彼此分离，豆瓣由滚轮压成片。

6.Calli were induced from cotyledons, hypocotyls, and taproot cambium of Daucus carrot. and cell suspension lines were established.

分别以胡萝卜子叶、下胚轴和直根形成层为外植体诱导出愈伤组织，并建立细胞悬浮系。

7.The stomatal index in the adaxial epidermis changed variably during development of cotyledons.

上表皮气孔指数的变化规律不明显；

8.After germination, the cotyledons 子叶 will eventually fall off as true leaves develop.

发芽后，cotyledons 子叶最终会随着真叶的生长而脱落。

9.Some plants have two cotyledons 子叶, which is a characteristic feature of dicots.

一些植物有两个cotyledons 子叶，这是双子叶植物的特征。

10.In botany class, we learned that the number of cotyledons 子叶 can help identify whether a plant is a monocot or dicot.

在植物学课上，我们了解到cotyledons 子叶的数量可以帮助识别植物是单子叶植物还是双子叶植物。

11.The seedling emerged from the soil, its first leaves were the cotyledons 子叶 that provided it with initial nutrients.

幼苗从土壤中冒出，它的第一片叶子是提供初始养分的cotyledons 子叶。

12.The cotyledons 子叶 of a bean seed are often larger and more noticeable than those of other seeds.

豆类种子的cotyledons 子叶通常比其他种子的更大且更显眼。

作文

In the world of botany, understanding the various parts of a plant is crucial for anyone interested in horticulture or agriculture. One of the fundamental components of a seedling is its cotyledons, which play a vital role in the early stages of a plant's life. The term cotyledons refers to the first leaves that appear from a germinating seed. These leaves are not true leaves but rather serve as a source of nourishment for the young plant until it can produce its own food through photosynthesis.The structure of cotyledons varies significantly among different plant species. In some plants, like beans, the cotyledons are large and fleshy, providing substantial energy reserves for the developing seedling. In contrast, other plants may have smaller or even absent cotyledons, relying instead on the energy stored within the seed itself. This diversity highlights the adaptability of plants to their environments, ensuring that they can survive and thrive in various conditions.When a seed germinates, the first thing that emerges is the root, followed closely by the cotyledons. These structures often help anchor the plant in the soil while also absorbing water and nutrients. As the plant continues to grow, the true leaves will develop, taking over the role of photosynthesis. The transition from cotyledons to true leaves marks a critical phase in a plant's life cycle, indicating that it is becoming more self-sufficient.In addition to their nutritional function, cotyledons also play a role in the identification of plant species. Botanists and horticulturists often use the shape, size, and number of cotyledons to classify plants. For instance, dicotyledons, or dicots, are plants that have two cotyledons, while monocotyledons, or monocots, have only one. This classification system is essential for understanding plant relationships and evolutionary history.Moreover, cotyledons can provide insight into the environmental adaptations of plants. For example, plants that grow in dry environments may have thicker cotyledons that store more moisture, whereas those in wet environments might have thinner cotyledons that allow for quicker nutrient absorption. By studying these adaptations, scientists can better understand how plants cope with their surroundings and what factors influence their growth and development.In conclusion, cotyledons are an essential aspect of plant biology that contributes to a plant's initial growth and survival. They serve as a crucial source of nutrients and play a significant role in the identification and classification of plant species. Understanding cotyledons not only enhances our knowledge of botany but also aids in the cultivation and conservation of plants in various ecosystems. As we continue to explore the fascinating world of plants, the study of cotyledons will undoubtedly remain a critical area of research, offering insights into the complex interactions between plants and their environments.

在植物学的世界中，理解植物的各个部分对任何对园艺或农业感兴趣的人来说都是至关重要的。种子发芽早期阶段的一个基本组成部分是它的子叶，它在植物生命的早期阶段发挥着至关重要的作用。术语子叶指的是从发芽的种子中出现的第一片叶子。这些叶子并不是真正的叶子，而是作为幼苗的营养来源，直到它能够通过光合作用自己生产食物。子叶的结构在不同植物物种之间有显著差异。在某些植物中，例如豆类，子叶又大又肉质，为发育中的幼苗提供了大量的能量储备。相比之下，其他植物可能有较小的甚至没有子叶，而是依靠种子本身储存的能量。这种多样性突显了植物对其环境的适应能力，确保它们能够在各种条件下生存和繁荣。当种子发芽时，首先出现的是根部，紧接着是子叶。这些结构通常帮助植物在土壤中固定，同时也吸收水分和养分。随着植物的继续生长，真正的叶子将会发育，接管光合作用的角色。从子叶到真正叶子的过渡标志着植物生命周期中的一个关键阶段，表明它变得更加自给自足。除了其营养功能外，子叶在植物物种的识别中也发挥着重要作用。植物学家和园艺师经常使用子叶的形状、大小和数量来分类植物。例如，双子叶植物或称为双子叶植物（dicots）是指具有两个子叶的植物，而单子叶植物或称为单子叶植物（monocots）则只有一个。这一分类系统对于理解植物的关系和进化历史至关重要。此外，子叶还可以提供植物环境适应性的见解。例如，生长在干燥环境中的植物可能拥有更厚的子叶，以储存更多的水分，而生长在湿润环境中的植物可能拥有更薄的子叶，以便更快地吸收养分。通过研究这些适应性，科学家可以更好地理解植物如何应对其周围环境以及哪些因素影响它们的生长和发育。总之，子叶是植物生物学的重要方面，对植物的初始生长和生存至关重要。它们作为重要的营养来源，并在植物物种的识别和分类中发挥重要作用。理解子叶不仅增强了我们对植物学的知识，而且有助于在各种生态系统中培养和保护植物。随着我们继续探索植物的迷人世界，子叶的研究无疑将仍然是一个关键的研究领域，为我们提供植物与其环境之间复杂相互作用的见解。