Understanding Nucellar Polyembryony
Nucellar polyembryony is a fascinating phenomenon in plant reproduction where multiple embryos develop from a single ovule, specifically from the nucellar tissue. This process is particularly well-documented in certain plant species.
Key Species: Citrus
- Citrus species, such as oranges, lemons, and limes, are prime examples of nucellar polyembryony.
- In these species, the nucellus, which is a part of the ovule, can give rise to several embryos, leading to a single seed containing multiple embryos.
Mechanism of Nucellar Polyembryony
- During fertilization, the egg cell is fertilized, but the surrounding nucellar cells can also develop into embryos.
- This results in the presence of genetically identical embryos within the same seed, enhancing the chances of successful germination.
Significance in Agriculture
- Nucellar polyembryony is beneficial in agriculture as it can lead to uniformity in plants when propagated from seeds.
- It allows for the production of genetically identical offspring, which is desirable for maintaining specific traits in cultivated varieties.
Comparative Analysis
- Other species mentioned, such as Gossypium (cotton), Triticum (wheat), and Brassica (mustard), do not typically exhibit this phenomenon.
- While some may show forms of polyembryony, they do not predominantly rely on the nucellar tissue for the development of multiple embryos in the same seed.
In conclusion, the correct answer is option 'A', Citrus, as it is renowned for exhibiting nucellar polyembryony, making it a significant species for study in plant reproductive biology and agriculture.