ISHS Acta Horticulturae 769: XXVII International Horticultural Congress - IHC2006: International Symposium on Asian Plants with Unique Horticultural Potential
PROPAGATION BY SOFTWOOD CUTTINGS FOR JAPANESE CHESTNUT |
| Authors: | T. Tetsumura, C. Honsho, K. Yamashita |
| Keywords: | Castanea crenata, IBA, micromist, mist, rooting, rooting medium |
| Abstract:
Japanese chestnut (Castanea crenata Sieb. et Zucc.) is one of the difficult-to-root species. An optimal condition for rooting of softwood cuttings collected from micropropagated seedling hedges was investigated in order to propagate elite rootstocks and to produce own-rooted trees. After dipping in 3000 ppm IBA solution, 5-, 10-, and 20-cm long softwood cuttings with terminal leaves of 50 cm2 were planted in rooting medium under intermittent mist in a greenhouse in late June. All four genotypes tested showed higher rooting percentages in the 5- and 10-cm long cuttings than that in the 20-cm cuttings, while differences in rooting percentages between the genotypes were also observed. The cuttings rooted better in Metro-Mix® than in Bora-tsuchi (volcanic tuff). After the IBA treatment, 10-cm long cuttings were inserted in late June, July and August. The cuttings inserted in late June and July rooted better than those inserted in late August. The cuttings irrigated by micromist, which improved the survival of cuttings planted in Bora-tsuchi, rooted better than those irrigated by mist. All cuttings of the tested genotypes with the highest rooting ability rooted in Metro-Mix® when taken in late June, while only 40% cuttings with the lowest rooting ability rooted under the same condition. Further improvements in rooting of the difficult-to-root genotypes are necessary. | |
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