Stimulation of axillary shoot formation of cuttings of Hylocereus trigonus (Cactaceae) by pre-soaking in benzyl-adenine solution
1980
Shimomura, T. | Fujihara, K. (Osaka Univ. (Japan). College of Agriculture, Lab. of Floriclture)
Either before or after curing their cut surfaces for 5 days, 7 cm- and 15-cm-long decapitated Hylocereus trigonus cuttings were treated by soaking their apical or basal ends in benzyladenine (BA) solution. They were then planted and grown in a greenhouse. For the 7 cm-long cuttings, BA (25-100 mg l('-1)) applied to the apical ends for 24 h, increased the ratio of cuttings with sprouted buds to 64-100%, the number of sprouted buds to 1.9-3.1 and of shoots to 1.6-2.8, and the shoot length to 35-60 mm, compared to the water control which showed 13%, 1.0, 1.0 and 12.5 mm, respectively. Soaking the basal part had only a small effect. Naphthylacetic acid (NAA) applied to the basal ends of cuttings immediately after cutting increased the number of sprouted buds and shoots by inducing early rooting. The number and length of BA-induced axillary shoots in the longer cuttings was greater than those in the shorter ones. In the 15-cm-long cuttings, increasing the soaking time from 5 min to 24 h resulted in a greater promotive effect of BA on shoot formation. BA applied before curing showed the same effect as that given after curing but caused necrosis of the tissue just under the cut surface. Enlarging the are soaked in BA solution from 5 cm to 10 cm decreased the number of sprouting buds and shoots
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