Double fertilization and triple fusion were discovered by

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In angiosperms, one male gamete fuses with the oosphere (egg) to produce diloid zygote or oospore. It is as generative fertilization. The other male gamete fuses with the diploid secondary nucleus (fusion product of two polar nuclei). It is known as vegetative fertilization or triple fusion because it involves fusion of one male nucleus and two polar nuclei. These two ways of fertilization which involves the fusion of two male gametes with two different structures, ie, egg and secondary nucleus, in the same female gametophyte to produce two different structures, ie embryo and endosperm respectively is known as double fertilization. Double fertilization was discovered by Nawaschin (1898) in Fritilaria and Lilium. It was confirmed by Guignard (1899).

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