Horizontal gene transfer in the evolution of photosynthetic eukaryotes EFFECT OF IMBIBITION UNDER SALT STRESS ON MERISTEMATIC CELL ULTRASTRUCTURE IN ROOT TIPS OF BARLEY Ultrastructure of Protein Bodies and Plastids in Cotyledon of Nelumbo nucifera Gaertn.at Seed Germination A Study on Ultrastructure, Development and Function of Plastids of Cuscuta australis R.Br