Difference Between Microspore and Pollen Grain

Thekey differencebetween microspore and pollen grain is thatmicrospore is the small孢子that develops into the malegametophyte在植物中，花粉谷物是含有男配子体的小谷物。

Plant reproduction takes place both sexually and asexually, showing the alternation of generation. There are two generations known assporophyticgeneration and gametophytic generation. Microspore and pollen grain are two structures that develop during these two generations. Microspore is a structure of sporophytic generation, whereas pollen grain is a structure of gametophytic generation. Also, the microscope is not a gametophyte while pollen grain is a gametophyte.

内容

1.Overview and Key Difference
2.What is Microspore
3.What is Pollen Grain
4.Similarities Between Microspore and Pollen Grain
5.Side by Side Comparison – Microspore vs Pollen Grain in Tabular Form
6.概括

什么是微孢子？

有两种类型的孢子在heterosp生产orous land plants. They are megaspores and microspores. The megaspore develops into the female gametophyte, whereas the microspore develops into the male gametophyte. Thus, microspores, link sporophytic generation and gametophytic generation during the alternation of generations. The gametophyte developed through microspore then produces themale gametes. The male gametes participate in sexual reproduction of plants. Finally, the microspore develops into the pollen grain, which is the actual male gametophyte.

Haploid microspores are present in the microsporangia inside the modified leaves called microsporophylls. The diploid microsporocytes produce microspores through meiosis. The structure of the microspore consists of three layers. They are the outer cover layer called the perispore, the middle layer called the exospore, and the inner layer is called the endospore.

What is Pollen Grain?

The pollen grain is the actual male gametophyte. Therefore, it develops from the microspore. Actually, it is the reduced form of male gametophyte. It is present only in seed plants: angiosperms and gymnosperms. The development of pollen grains from microspores takes place through the process of microgametogenesis. Meiosis is the principle phenomenon in pollen grain development.

每个花粉颗粒由四个细胞和外部位于外部的一对空气囊组成。在开花植物中，花药中的囊中存在花粉颗粒。它们是单倍体细胞。他们在授粉期间转移到女配子体。因此，这导致了受精过程。

微孢子和花粉谷物之间有什么相似之处？

• Microspore and pollen grain are produced by the process of meiosis.
• Both produce via microsporocytes.
• 此外，两者都在异质植物中发现。
• Also, both result in forming the male part (male gametangia) of the plant during sexual reproduction.
• Besides, they are haploid in nature.
• Additionally, both are small structures.

微孢子和花粉谷物有什么区别？

The key difference between microspore and pollen grain is based on the gametophyte. That is; the microspore develops into the male gametophyte while the pollen grain contains the male gametophyte. Furthermore, microspores develop only via meiosis, whereas pollen grains develop via meiosis and then undergo mitosis. In this regard, this is also a difference between microspore and pollen grain.

Moreover, a further difference between microspore and pollen grain is that even though both cells are haploid in nature, microspore is unicellular, whereas pollen grains are multicellular.

The below infographic presents more information regarding the difference between microspore and pollen grain.

概括– Microspore vs Pollen Grain

微孢子和花粉颗粒是血管植物繁殖过程中的重要结构。微孢子通过微孢子形成发展。当条件最佳时，微孢子会发展成被称为花粉粒的雄性配子体。在这方面，花粉谷物是雄性配子体，其中包含有性繁殖的男配子。因此，微孢子是植物中性和无性繁殖之间的主要联系。因此，这总结了微孢子和花粉谷物之间的差异。

Reference:

1. “FLOWERING PLANT REPRODUCTION: Fertilization and Fruits.”Flowering Plant Reproduction II,Available here.

Image Courtesy:

1. Ladyofhats Mariana Ruiz创作的“ Angiosperm生命周期图” - 我自己是基于至少5个插图，但主要是由Judd，Walter S.，Campbell，Charkbell，Christopher S.，Kellog S.，Kellog，Kellog，Elizabeth A. Andstevens，Peter的图像。F.1999。植物系统学：系统发育范围。（公共领域）通过Commons Wikimedia
2. “Passiflora Pollen Grains” By Asja Radja – Own work(CC BY-SA 4.0)viaCommons Wikimedia