Rooting of stem cuttings in Intsia bijuga (Colebr) O. Kuntze (Family Caesalpiniaceae)
2002
Edmiston, M.P.F. (De La Salle Univ. Manila, Taft Ave., Manila 1004 (Philippines). Biology Dept.)
Rooting responses in stem cuttings of Intsia bijuga (Colebr.) O. Kuntze (Family Caesalpiniaceae) with nodes 1-3 (young) and 4-5 (mature) from the shoot tip were variable with the formation of: (a) dot-like fissures with emerging roots less than 1 inch long; (b) 1-2 roots without laterals, and (c) 1-3 roots with laterals or profuse roots. Some did not root at all. Percent viability in young cuttings was slightly higher than in mature cuttings but for most treatments, these were not significantly different. Absence of rooting ranged from 0 to 40% in young cuttings and from 5 to 70% in mature cuttings. Rates of formation of dot-like fissures and emerging roots in both young and mature cuttings were not significantly different in almost all of the tretments. Young cuttings rooted 100% under three treatments: 1500 ppm IBA, 2000 ppm IBA and 500 ppm IBA + 500 ppm NAA. Total rooting percent in 0.1% Superthrive (a vitamin - hormone solution) was 78 and 17% in young and old cuttings, respectively. Young cuttings consistently performed better than old cuttings in all rooting responses observed. The study shows that the plant is an easy-to-root species since 91% of the young cuttings rooted under the control treatment. The ease of production of roots by even untreated cuttings indicates the low cost and commercial potential of producing I. bijuga clones
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