Ultrastructural changes in the root tip cells developed from artificially aged seeds of three cultivars of pigeonpea (Cajanus cajan (L.) Millsp.) cultivars ICPL 87, T21 and PDM1 were studied. Ageing was induced using accelerated ageing technique by exposure to 40 *C and relative humidity of 100% for a period of eight days. Ageing of seeds resulted in damages to cell walls, cell membranes and cell organelles of root tip cells. The decrease in oxygen uptake and dehydrogenase activity due to accelerated ageing reflected on the mitochondrial damage as evidenced by the electron microscopic studies of root tip cells. All these changes lead to decreased seed viability. The cultivar T 21 exhibited highest seed viability and storage potential.
