cotyledon

简明释义

英[ˌkɒtɪˈliːdən]美[ˌkɑːtɪˈliːdən]

n. [植] 子叶

复 数 c o t y l e d o n s

英英释义

单词用法

同义词

反义词

例句

1.Rootstock cotyledon had a positive effect on success rate, while its sprouting axillary shoots had a negative effect on scion growth.

保留砧木子叶有利于提高嫁接成活率，但其萌发的腋生芽对接穗生长不利；

2.The NPR of green pods was very small, and that of cotyledon higher.

夏大豆绿色豆荚的光合速率很低，而子叶的光合速率却较高。

3.The protein bodies developed later than oil bodies. There were a few starch granules in pericarp, seed coat and cotyledon.

果皮，种皮，子叶都储存淀粉粒，但含量较油体和蛋白体少。

4.The paper studied effects of GA_3 and IAA on cellulase activity in abscission zone from petiole of primary leaves of bean, cotyledon petioles and boll petioles of cotton.

赤霉酸（GA_3）处理菜豆叶柄和棉苗子叶柄外植体，离区的纤维素酶活力增加，而吲哚乙酸（IAA）则抑制离区纤维索酶的活力。

5.Pistacia chinensis was woody oil plant. The oil bodies in the pericarp, seed coat and cotyledon were examined during the development of fruits of Pistacia chinensis.

黄连木是一种重要木本油料植物，其果实中储存有大量的油类物质，这些油类主要以油体的形式存在于果皮、种皮和子叶中。

6.The average resistance effect of the mycelial water extracts to the disease of cucumber scab reached 74.04% by spraying spore suspension on yellow cotyledon.

经黄化子叶喷雾接种法测定，姬松茸菌丝水体物对黄瓜黑星病的平均诱导抗病效果为74.04%。

7.The esterase isoenzyme bands were the most in cotyledon differentiatingembryoid, but the least in mature embryoid.

酯酶同工酶则以子叶分化期胚为最多，成熟胚为最少。

8.There was a big difference in the induction frequency from cotyledon culture to various genotypes of faba bean.

不同基因型对蚕豆子叶节诱导芽效果差异很大；

9.The first leaf that emerges from a seed is called the cotyledon, which is the plant's initial source of nutrients.

从种子中长出的第一片叶子被称为子叶，这是植物最初的营养来源。

10.A monocot has one cotyledon, while a dicot has two.

单子叶植物有一个子叶，而双子叶植物有两个。

11.During germination, the cotyledon provides essential energy for the developing plant.

在发芽过程中，子叶为正在发育的植物提供必要的能量。

12.The green color of the cotyledon indicates that it is ready to start photosynthesis.

子叶的绿色表明它准备开始光合作用。

13.In some plants, the cotyledon can photosynthesize, helping the seedling grow until true leaves develop.

在某些植物中，子叶可以进行光合作用，帮助幼苗生长，直到真正的叶子发育出来。

作文

In the world of botany, understanding the various parts of a plant is crucial for both students and enthusiasts alike. One of the most fascinating components of seed plants is the cotyledon, which plays a significant role in the early stages of a plant's life cycle. A cotyledon is essentially the first leaf or leaves that appear from a seed during germination. These leaves are not just ordinary leaves; they are vital for the initial growth and development of the plant, providing essential nutrients that the young seedling needs to thrive.When a seed germinates, it breaks open, and the cotyledon emerges from the soil. Depending on the type of plant, a seed can have one or two cotyledons. Plants with one cotyledon are known as monocots, while those with two cotyledons are referred to as dicots. This distinction is important in botany, as it helps scientists and gardeners categorize plants and understand their growth patterns.The primary function of the cotyledon is to store food for the young plant. As the seed develops, it accumulates nutrients, which are then transferred to the cotyledon. During the early days of a plant's life, when it is still establishing its roots and leaves, the cotyledon provides the necessary sustenance for growth. Once the plant begins to photosynthesize, the cotyledon may eventually wither and fall off, but its initial role is critical for survival.In addition to their nutritional role, cotyledons also help in the identification of plant species. Botanists often use the characteristics of cotyledons—such as their shape, size, and number—to classify and differentiate between various types of plants. For instance, the cotyledons of a sunflower are broad and oval-shaped, while those of a grass plant are narrow and linear. This morphological diversity is essential for understanding plant taxonomy and evolution.Moreover, studying cotyledons can provide insights into agricultural practices. Farmers and horticulturists can benefit from knowing how different plants utilize their cotyledons to optimize growing conditions. For example, understanding the germination process and the role of cotyledons can lead to better seedling management, ultimately improving crop yields.In conclusion, the cotyledon is more than just a simple leaf; it is a fundamental part of a plant's early life that serves multiple purposes. From providing nourishment to aiding in plant classification, cotyledons are essential for understanding plant biology. Whether you are a student of botany, a gardener, or simply someone interested in the natural world, recognizing the importance of cotyledons can deepen your appreciation for the intricate processes that sustain plant life. As we continue to explore the wonders of nature, let us not overlook the humble yet significant cotyledon and its contributions to the ecosystem.

在植物学的世界中，理解植物的各个部分对学生和爱好者来说都是至关重要的。种子植物最迷人的组成部分之一是子叶，它在植物生命周期的早期阶段发挥着重要作用。子叶本质上是种子发芽时出现的第一片叶子或叶子。这些叶子不仅仅是普通的叶子；它们对植物的初始生长和发育至关重要，提供年轻幼苗所需的基本营养。当种子发芽时，它会破裂，子叶从土壤中冒出。根据植物的类型，种子可以有一个或两个子叶。具有一个子叶的植物称为单子叶植物，而具有两个子叶的植物则被称为双子叶植物。这一区分在植物学中非常重要，因为它有助于科学家和园丁对植物进行分类并了解其生长模式。子叶的主要功能是为年轻植物储存食物。当种子发育时，它会积累养分，然后转移到子叶中。在植物生命的早期阶段，当它仍在建立根系和叶子时，子叶提供了生长所需的营养。一旦植物开始进行光合作用，子叶可能最终会枯萎并掉落，但它的初始作用对生存至关重要。除了营养作用外，子叶还有助于植物种类的识别。植物学家常常利用子叶的特征——如形状、大小和数量——来分类和区分各种植物。例如，向日葵的子叶宽大而呈椭圆形，而草植物的子叶则狭窄且线性。这种形态多样性对于理解植物分类学和进化至关重要。此外，研究子叶可以为农业实践提供见解。农民和园艺师可以通过了解不同植物如何利用其子叶来优化生长条件。例如，了解发芽过程和子叶的作用可以导致更好的幼苗管理，从而最终提高作物产量。总之，子叶不仅仅是一片简单的叶子；它是植物早期生命中的一个基本部分，具有多重功能。从提供营养到帮助植物分类，子叶对于理解植物生物学至关重要。无论你是植物学的学生、园丁，还是仅仅对自然界感兴趣的人，认识到子叶的重要性都可以加深你对维持植物生命的复杂过程的欣赏。当我们继续探索自然的奇迹时，让我们不要忽视谦逊而又重要的子叶及其对生态系统的贡献。