megaspore

简明释义

英[ˈmeɡəˌspɔː]美[ˈmeɡəˌspɔːr]

n. 大孢子；（种子植物的）胚囊

英英释义

单词用法

同义词

反义词

例句

1.Megaspore tetrad is linear. the chalazal megaspore develops into an embryo sac of polygonum type. Hypostase and special integument tapetum exist in the ovule.

大胞子四分体线形排列，合点端大孢子为功能大孢子，胚囊发育类型为蓼型，具有特化的珠被绒毡层和承珠盘。

2.Arrangement of megaspore is linear shaped, the megaspore of chalazal end is functional megaspore.

大孢子排列为直线型，合点端大孢子为功能大孢子。

3.This shows a synchronous development of megaspore and pollen chamber.

反映大孢子发育和贮粉室发生的同步性。

4.Megaspore tetrad is linear. The chalazal megaspore develops into an embryo sac of Polygonum type.

大孢子四分体为线形，合点端功能大孢子发育成为蓼型胚囊。

5.Megaspore tetrad is linear. the chalazal megaspore develops into an embryo sac of polygonum type. Hypostase and special integument tapetum exist in the ovule.

大胞子四分体线形排列，合点端大孢子为功能大孢子，胚囊发育类型为蓼型，具有特化的珠被绒毡层和承珠盘。

6.Development of megaspore and formation of embryo sac: the ovule has a layer of parietal cells at the sporogenous stage.

大孢子的发育及胚囊的形成：造孢时期，造孢细胞发育成大孢子母细胞。

7.As development goes on, callose fluorescence disappears in the chalazal wall of diplosporous functional megaspore .

二倍体功能大孢子的合点端细胞壁内的胼胝质荧光消失。

8.A single archesporium differentiates immediately below the nucellar epidermis, it functions directly the megaspore mother cell.

孢原细胞处于珠心表皮之下，直接起大孢子母细胞的功能。

9.The development of a megaspore 大孢子 is crucial for the reproductive cycle of many plants.

大多数植物的繁殖周期中，大孢子 megaspore 的发育至关重要。

10.In gymnosperms, the megaspore 大孢子 produces the female gametophyte.

在裸子植物中，大孢子 megaspore 产生雌配子体。

11.The megaspore 大孢子 is often found in the ovule of seed plants.

大孢子 megaspore 通常在种子植物的胚珠中发现。

12.Each megaspore 大孢子 can develop into a female gametophyte after fertilization.

每个 大孢子 megaspore 在受精后可以发育成雌配子体。

13.Scientists study the megaspore 大孢子 formation to understand plant evolution.

科学家研究 大孢子 megaspore 的形成以理解植物进化。

作文

In the study of plant biology, understanding the reproductive structures and processes is crucial for comprehending how plants propagate and evolve. One of the significant components in the life cycle of certain plants, particularly those in the group of seed plants, is the concept of the megaspore. A megaspore is defined as a large spore that develops into the female gametophyte, which is essential for reproduction in many vascular plants. This process is vital for the continuation of plant species and plays a key role in their evolutionary success.The formation of a megaspore occurs during a process called meiosis, where diploid cells undergo division to create haploid spores. In contrast to microspores, which are smaller and develop into male gametophytes, megaspores are larger and are typically produced in smaller quantities. This difference in size and quantity reflects the different roles they play in the reproductive cycle of plants. For example, while a single megaspore can give rise to a female gametophyte that produces eggs, numerous microspores will develop into pollen grains, which are responsible for fertilization.The significance of the megaspore extends beyond its immediate role in reproduction. It also highlights the intricate relationship between plants and their environments. The development of the megaspore is influenced by various environmental factors such as temperature, humidity, and light availability. These factors can affect the timing of spore release and the success of fertilization, which are critical for the survival of plant species. Furthermore, understanding the characteristics and behavior of megaspores can provide insights into plant adaptation and resilience in changing environments.Moreover, the study of megaspores is not limited to just academic interest; it has practical implications as well. For instance, in agriculture, knowledge about the reproductive mechanisms of plants can inform breeding programs aimed at enhancing crop yields and resistance to diseases. By manipulating the conditions under which megaspores develop, farmers and scientists can improve the efficiency of plant reproduction and ensure food security.In addition to agricultural applications, the exploration of megaspores also contributes to our understanding of biodiversity. As researchers investigate different plant species and their reproductive strategies, they uncover the vast diversity of life forms on Earth. This research underscores the importance of conserving habitats that support diverse plant communities, as these ecosystems rely heavily on the successful reproduction of plants through mechanisms involving megaspores and microspores.In conclusion, the megaspore represents a fascinating aspect of plant biology that encompasses reproductive strategies, environmental interactions, and broader ecological implications. By studying megaspores, we gain valuable insights into the complexities of plant life and the critical roles they play in our ecosystems. As we face challenges such as climate change and habitat destruction, understanding the mechanisms of plant reproduction, including the significance of megaspores, will be essential for preserving biodiversity and ensuring sustainable agricultural practices for future generations.

在植物生物学的研究中，理解生殖结构和过程对于理解植物如何繁殖和进化至关重要。某些植物，特别是种子植物群体中的一个重要组成部分，就是megaspore的概念。megaspore被定义为一种大型孢子，它发育成雌配子体，这对许多维管植物的繁殖至关重要。这个过程对于植物物种的延续至关重要，并在它们的进化成功中发挥了关键作用。megaspore的形成发生在一种称为减数分裂的过程中，二倍体细胞经历分裂以创建单倍体孢子。与微孢子相比，微孢子更小并发育成雄配子体，而megaspore则较大，通常以较少的数量产生。这种大小和数量的差异反映了它们在植物生殖周期中所扮演的不同角色。例如，单个megaspore可以产生一个产生卵子的雌配子体，而大量的微孢子将发展成花粉粒，负责受精。megaspore的重要性不仅限于其在繁殖中的直接作用。它还突显了植物与其环境之间的复杂关系。megaspore的发育受到温度、湿度和光照等各种环境因素的影响。这些因素可以影响孢子的释放时机和受精的成功，这对植物物种的生存至关重要。此外，理解megaspore的特征和行为可以提供有关植物适应性和在变化环境中韧性的见解。此外，研究megaspore的意义不仅限于学术兴趣；它也具有实际意义。例如，在农业中，了解植物的繁殖机制可以为提高作物产量和抗病能力的育种项目提供信息。通过操控megaspore发展的条件，农民和科学家可以提高植物繁殖的效率，并确保粮食安全。除了农业应用外，探索megaspore还促进了我们对生物多样性的理解。当研究人员调查不同植物物种及其繁殖策略时，他们揭示了地球上生命形式的巨大多样性。这项研究强调了保护支持多样植物群落的栖息地的重要性，因为这些生态系统在很大程度上依赖于通过涉及megaspore和微孢子的机制成功繁殖植物。总之，megaspore代表了植物生物学的一个迷人方面，涵盖了生殖策略、环境互动和更广泛的生态影响。通过研究megaspore，我们获得了对植物生命复杂性的宝贵见解，以及它们在生态系统中扮演的关键角色。随着我们面临气候变化和栖息地破坏等挑战，理解植物繁殖机制，包括megaspore的重要性，将对保护生物多样性和确保未来几代人的可持续农业实践至关重要。