Conclusion and the Future

Abstract

The transformations of proplastid to chloroplast and subsequently chloroplast to gerontoplast are tightly coupled to the leaf development. The assembly and organization of chloroplast occur during leaf growth and expansion whereas the process of disassembly of the organelle starts when leaf turns yellow during senescence. Both assembly and disassembly processes are controlled by several factors with active participation of both plastid and nuclear genes. In both the cases the nuclear genome plays a major regulatory role although the role of a plastid factor in controlling some of the events has been suggested.