Propagation of Red Data Proteaceae Species of tlie Agullias Plain

摘要

Propagation of Red Data Proteaceae on the Agulhas Plain remains limited. This study highlighted the threats of four Leucadendron species. Further emphasis is placed on the propagation of Leucadendron laxum which is harvested as a indigenous cut flower.The application of rooting hormone indoleacetic acid (lAA) in various rooting mediums in L. laxum was tested under greenhouse conditions and under shade house conditions. The treatments included: control, 500,10oo. 2000, and 4000 ppm, and four rooting mediums: (a) bark and polystyrene; (b) peat moss and polystyrene; (c) bark, river sand, and polystyrene; and (d) perlite and river sand. A randomised block design with three replicates was used. Compared with other media, bark and polystyrene had the highest significant results in root and shoot growth, and the percentage that callused, rooted, and survived. The lAA treatments at different concentrations had significant effects on rooting, cal-lusing, shoot growth, root lengths, and numbers of roots percutting. Evidence from this study was conclusive that the shade tunnel was more successful in rooting L. laxum than the environmentally controlled greenhouse environment.