Effect of pre-treatments on Holarrhe1va antidysenterica (Linn) wall seeds with chemicals and growth regulator on its germination

During the laboratory germination testing of one year old seeds of Holarrihena antidysenterica (Linn) Wall at times failed to germinate. This failure in germination is probably related to the state of seed dormancy. The exogenous application of hormones such as gibberellic acid (GA₃) has been reported to break the seed dormancy (Khan 1980). However, precise information regarding breaking of dormancy in Holarrihena antidysenterica (Linn) wall is not available. In the present investigation an atternpt has been made to find out a suitable method of breaking the dormancy. Among the chemicals KNO₃ followed by thiourea was the most effective in breaking the seed dormancy.