Difference WikiBiology

Difference Between Double Fertilization and Triple Fusion

Main Difference

The main difference between Double Fertilization and Triple Fusion is that Double Fertilization is the fusion of one sperm with one egg cell, whereas Triple Fusion is the combination of one fused nucleus with one sperm cell in the embryonic sac.

Double Fertilization vs. Triple Fusion

Double fertilization is the process of fertilization in angiosperm, whereas triple fusion is the process of fertilization in which one fused nucleus combines with two polar nuclei. In double fertilization, there is a combination of one sperm and one egg cell; on the other hand, triple fusion is the combination of one already fused nucleus with two polar nuclei.

In double fertilization, the diploid nucleus is formed, whereas, in triple fusion, the triple endos nucleus is produced. In double fertilization, both double and triple endosperm is produced, whereas, in triple fusion, the only triple endosperm is produced; in plants, the only reproductive structures are flowers.

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In the process of producing angiosperm where the male reproductive structure is stamen, and the female reproductive structure is pistols, double fertilization of male and female spores produces the zygote, whereas fertilization of male spore and fertilized zygote called triple fusion.

Comparison Chart

Double FertilizationTriple Fusion
It is defined as the fertilization of one male spore and one female spore to produce one zygote.It is defined as the fusion of one complete zygote and one male spore.
Combining Ability
In this fertilization, one male spore and one female egg spore is fertilized.It is the combination of one sperm nuclei and a fertilized egg.
Endosperm
In this fertilization, only two endosperms are produced.In this fusion, both double and triple endosperm is produced.
Formations
In this fertilization, fertilization of both spores produced a zygote.In this type of fusion, fertilized zygote combines with two nuclei to produce endosperm.
Presence
It is present in all types of plants.It is present in all the plants but mostly present in seed-producing plants.
Result
The double fertilization is done through a combination of the embryonic sac with two sperm.Triple fusion is produced by the endosperm in the plants.
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What is Double Fertilization?

It is defined as the combination of sperm and egg cell in plants and produces a fertilized zygote. It happens inside the plant body. It produces the two endosperms inside the plant body. It is present in all types of plants. During double fertilization, the male spore form at the filament. In plants, the reproducing structure is the flower. All the reproduction is completed in flower.

The male spores are produced at the end of the filament rod than it becomes mature — the male spore than traveled from the filament to the female producing structure pistils. Spores are reached by pollination methods. Pollination is done in many ways, like through water, air, etc.

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When microsporangium reached the stigma, one of two spores forms a long tube, which is called the pollen tube for the passage of sperm. When one of the sperm reached the bottom, then it fused with egg and formed a fertilized zygote. Then zygote changes into ovule and then becomes into seed or fruit. Then it changes into new plants.

What is Triple Fusion?

It is defined as the fusion of one spore with the fertilized zygote. It is also called the next step of double fertilization. The ovule is formed after the triple fusion. In this step, the ovule is formed from the triple endosperm. The sperm reached at the end of the pollen tube fused with the two sperm zygote, and triple endosperm is produced.

The spore reached stigma contains both nuclei, i.e., generative and tube nucleus. The tube nucleus is used to form a long tube that can carry the pollen grain to the end of the tube. When sperm reached the bottom, then the generative nucleus is fused with the female egg cell, then it forms a zygote. Another sperm followed the same path and reached the bottom; they try to fuse with the zygote and then formed endosperm of the triple nucleus.

The two sperm form zygote and one of three spores form a covering to provide protection and food. This zygote inside the covering grows into ovule and then fruits and seeds. The outer covering or seed coat protects the harms of the dangers surrounding and protect the zygote to not to completely dry out from the surrounding heat.

Key Differences

  1. Double fertilization is the combination of one male and one female spore, which form a zygote, whereas triple fusion is the combination of spore with the fertilized egg.
  2. In double fertilization, only one spore and one egg are combined; on the other hand, in triple fusion, there is the combination of one fertilized zygote with the spore.
  3. Double fertilization is done by two endosperms; conversely, triple fusion is done by both triple and double endosperms.
  4. Double fertilization is present in all the types of plants that have flowers; on the flip side, triple fusion is present in seed or fruit-producing plants.
  5. Double fertilization is the process of angiosperm, whereas triple fusion is the process of fusion of fertilized egg with the single sperm in the embryonic sac.

Conclusion

Double fertilization is the combination of spores of two different types, whereas triple fusion is the combination of one spore and fertilized egg.

Janet White

Janet White is a writer and blogger for Difference Wiki since 2015. She has a master's degree in science and medical journalism from Boston University. Apart from work, she enjoys exercising, reading, and spending time with her friends and family. Connect with her on Twitter @Janet__White