Effect of Plant Growth Regulators on Cutting Rooting of Plukenetia volubilis L.

Key words: 
• Plukenetia volubilis /
• oil-bearing crop /
• plant growth regulator /
• cutting /
• rooting rate

Abstract: Cutting,a vegetative propagation method,has been widely used in propagation of economic crops,since it has numerous advantages,such as higher propagation rate,shorter growth cycle,stable genetic traits,lower cost,earlier flowering,etc. An experiment was conducted to study the effects of four plant growth regulators（ ABT1,IBA,GGR and IAA） at four different concentrations( 50,100,200 and 500 mg·L^-1) with three different dipping time（ 0. 5,1 and 2 h） on the rooting of one-year-old semi-wooden cutting of Plukenetia volubilis. The results showed that the most effective treatments for rooting were IBA 100 mg · L^-1（ dipping for 1hour）,ABT1 100 mg·L^-1（ dipping for 0. 5 hour） and IBA 50 mg·L^-1（ dipping for 1 hour）,under which the rooting rates of the cuttings were 66. 67 %,63. 33 % and 60. 00 %,respectively,significantly higher than those of the control and the other treatment. As for survival rate,the most effect effective treatments were IBA 50mg·L^-1（ dipping for 1 hour）,IBA 100 mg·L^-1（ dipping for 1 hour） and ABT1 50 mg·L^-1（ dipping for 0. 5hour）,under which the cutting survival rates were 70. 00%,66. 67% and 66. 67%,respectively. Taking into consideration the rooting rate,survival rate and growth condition after transplanting,dipping the cutting in 100mg·L^-1IBA for 1 hour could be the most suitable treatment for the rooting of P. volubilis cutting.