Provenance variation in rooting ability of juvenile stem cuttings from Racosperma auriculiforme and R. mangium.
Khasa P.D. | Vallee G. | Bousquet J.
Provenance variation in rooting ability was examined in Racosperma spp. using leafy stem cuttings of 11 provenances of R. auriculiforme and 12 of R. mangium taken from 5-month-old ortets. The cuttings were set in a 1:1 peat moss and vermiculite mixture and were rooted in a "bouturatheque" propagator. The application of 0.8% indole butyric acid (IBA) hormone significantly increased (P < 0.05) number of roots per cutting, root length, root dry weight, and rooting percentage, but marginally decreased number of shoots. However, significant hormone x species interactions were noted for mean root length, root dry weight, and rooting percentage, which were greater in R. mangium than in R. auriculiforme. Hormone x provenance within species interaction was also significant for the number of roots, rooting percentage, and shoot height. The differences among provenances within species were greater when hormone treatment was used. In principal components analysis of plot means, we identified the first factor as a rooting ability index of cuttings (RAIC). We further show how this index can be used, in conjunction with field growth data, for selection of provenances, families, or genotypes that both root and perform well after outplanting. In all cases, selection appeared more efficient following hormone treatment.
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