Incompatibility is the natural barrier in the fusion of gamete”. Justify this statement.
Pollen grains of a plant species cannot germinate on the stigma of other non-related species as both the species are incompatible and the process is called pollen – pistil incompatibility. In many angiosperms plants, it is observed that pollen grains germinate on the stigma of non-related species but male gametes produced in pollen tubes cannot fertilize eggs. This is called gametic incompatibility. Self-incompatibility can be attained by utilizing any of the following ways:- 1. Pollen Stigma interaction: - In this phenomenon, pollen grains fail to germinate on Stigma because of incompatibility. 2. Pollen tube style interaction: - In this phenomenon, pollen grains become able to germinate on stigma & pollen tube penetrate stigmatic surface but due to incompatibility growth of pollen tube within stigma & style is inhibited. 3. Pollen – ovule interaction: - pollen tube successfully pierces & grows within style & its growth is inhibited at micropyle of ovule
