In a number of angiosperm species, maternal inheritance is brought about by degradation of paternal plastids. During male gametophyte development in species belonging to the Solanum type of maternal inheritance, plastids in the generative cells are selectively destructed whereas plastids in the vegetative cell remain intact (Fig. 2). Consequently, as in the Lycopersicon type, the two sperm cells carrying out the double fertilization are free of plastids.
The examples of species utilizing the plastid exclusion mechanism of the Ly-copersicon type and those utilizing the plastid degradation mechanism of the So-lanum type (Table 2) illustrate that even closely related species can differ in the cytological mechanisms conferring maternal plastid inheritance: tomato (Solanum lycopersicum, formerly Lycopersicon esculentum) and potato (Solanum tubero-sum) belong to the same genus of Solanaceae, but yet exhibit different modes of maternal plastid inheritance.
Was this article helpful?