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Abstract
T he purpose of the present work was to study the effects of auxin, boron, caffeic acid, and paclobutrazol alone or together on the rooting of herbaceous cuttings of Eucalyptus grandis W. Hill ex Maiden. Herbaceus stems from the clone G0269 Eucalyptus grandis were collected from 3- year-old stock plants which were 10 cm in length and had 2 leaves on the apex portion. Two centimeters of the cutting bases were immersed for 18 hours in the following treatments: 1 – water; 2 – Boron (B) a 150 mg.L ¹; + T3 – NAA (naphtaleneacetic acid) a 200 mg. L¹; T4 – paclobutrazol a 100 mg. L¹; T5 caffeic acid 100 mg L-¹; T6 – NAA 200 mg.L-¹ + B 150 mg. L-¹; T8- caffeic acid 100 mg.L-¹ + B 150 mg.L -¹; T10 – NAA 200 mg.L-¹ + caffeic acid 100 mg-¹ + B 150 mg. L-¹; T11 – NAA 200 mg.L -¹ + caffeic acid 100 mg.L-¹ + paclobutrazol 100 mg.L -¹ + B 150 mg. L-¹; T12 – caffeic acid 100 mg.L -¹ + paclobutrazol 100 mg.L -¹ + B 150 mg.L After treatment, the cuttings were planted in beds for rooting, using carbonized rice coat as the rooting medium. They were then kept in the mist chaber tor 40 days until collection. The evaluation of the treatments of Eucalyptus grandis cuttings was carried and callusing of stem cuttings, was carried out on the basis of the following observations: degree of rooting and callusing of stem cuttings, survival of cuttings, and percentage of dead stem cuttings. The results showed that boron, caffeic acid, and NAA + B treatments were the best to promote the rooting of Eucalyptus grandis cuttings. Therefore, boron and caffeic acid rooting co-factors stimulante the root formation in Eucalyptus grandis cuttings.
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Copyright (c) 2003 Fábio Scachetti Ciciliato, Elizabeth Orika Ono, João Domingos Rodrigues
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