Double Fertilisation and Triple Fussion


 
 
Concept Explanation
 

Double Fertilisation and Triple Fussion

The process was demonstrated for the first time by Nawaschin in 1898 in Lilium and Fritillaria. The most important and unique characteristic feature of angiosperms is the participation of both male gametes in the act of fertilisation. The pollen tube releases the two male gametes into the cytoplasm of a synergid. One male gamete fuses with the egg cell to form a diploid zygote. This process is called syngamy or generative fertilisation.

The diploid zygote finally develops into the embryo. The second male gamete fuses with the two polar nuclei or secondary nucleus in the central cell to form the triploid Primary Endosperm Nucleus (PEN). The process is called triple fusion as three haploid nuclei are involved in the fusion.

After triple fusion, the central cell becomes the Primary Endosperm Cell (PEC) which gives rise to the endosperm while. the zygote develops into the embryo. As two fusions, syngamy and triple fusion occur in an embryo sac, the phenomenon is known as double fertilisation.

                         

 
 
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