Studies on Variability in Seed Longevity of Castor (Ricinus communis L.) in Relation to Seed Morphological Characters

The castor secds under the present investigation showed wide variation in the seed morphological characteristics viz.. seed size, length and breadth ratio. caruncle size, mottling, colour and thickness of the seed coat and seed surface. Presence of caruncle did not show any additive effect on seed germination. Based on the size, the seeds were c1assitied into three categories viz. small, medium and bold. Different sized seeds showed significant differences in their seed viability and vigour pattern during storage. The desiccated seeds of medium size at 4.0% moisture on fresh weight basis showed maximum survival of 65–70 percent after storage of tive years at ambient temperature.