Lines and cultivars resistant to mechanical damage with white and colored seeds germinated 60–80% compared to under 20% for several major cultivars. Seed damage resistance was associated with transverse cotyledon cracking (TVC) resistance, r = .649, seed coat shattering (SH) resistance, r = .488, and seed coat weight, r = .373. The SH test indicates whether the seed coat is tightly or loosely adhered to the cotyledons. If % seed coat as a proportion of seed weight exceeded 10% and TVC and SH were under 10%, then damage resistance was almost always good. Weakness in any one character resulted in damage susceptibility. Damage resistant lines produced more vigorous seedlings than susceptible lines following seed maltreatment. Damage resistance was correlated, r = .722, with seedling vigor following seed impaction.
Received for publication March 24, 1976. Approved by the Director of the New York State Agricultural Experiment Station, Geneva, NY 14456, as Journal Paper No. 2210.
Associate Professor and Experimentalist, respectively.