Two new species of Plectranthus L

Abstract

Vegetative propagation studies were carried out at Maseno University, Kenya in the year 2004 and 2005 using stem cuttings on three endangered indigenous tree species namely Asystasia schimperi, Carissa edulis and Toddalia asiatica to test the effect of IBA on rooting of the stem cuttings of these plant species. Juvenile stem cuttings of these plant species were dipped in different concentrations of auxin (indole Butyric Acid (IBA) of 0, 100 ppm, 200ppm, 400ppm and 500ppm. Completely, randomized design (C.R.D) was used and the treatments replicated three times in a non mist polypropagator. The treated cuttings were planted in polythene pots. The duration of the experiment was four months. Data taken were plant height, number of leaves and number of rooted cuttings every 2 weeks. Data was subjected to analysis of variance (ANOVA) and means separated by L.S.D at 5% significance level. The results showed that hormone concentration, species and date of sampling affected the number of rooted plants, plant height and number of leaves Asystasia schimperi had the best rooting and subsequent plant growth followed by Carissa edulis and lastly Toddalia asiatica, . It can be concluded that Asystasia schimperi and Toddalia asiatica can be propagated by stem cuttings easily hence farmers can cultivate them.