The effects of organic inputs on growth, yield, and alkaloid content of Catharanthus roseus L. under defoliation stress
Journal Title: International Journal of Farming and Allied Sciences - Year 2016, Vol 5, Issue 4
Abstract
Madagascar periwinkle (Catharanthus roseus L., Apocynaceae) is an important medicinal plant, which is given much attention due to its valuable alkaloids. In order to study the effects of organic fertilisers (vermicompost [7 t/ha], arbuscular mycorrhizal fungus [Glomus mosseae L.] and control) and defoliation stress (removing of 0%, 25% and 50% of the leaves) on this plant, a factorial experiment based on randomised complete block design with three replications per treatment, was conducted at Research Station of Department of Horticultural Science, University of Tehran, Karaj, Iran, in 2014. Measured criteria were (1) growth parameters (plant height and diameter, leaf area, collar diameter, number of main stems and number of nodes per plant); (2) yield components (shoot fresh and dry weights); (3) root traits (fresh and dry weights and colonisation percentage); and (4) total alkaloid content. The results indicated significant effects of the treatments on many of the traits. Compared to the control plants, vermicompost-treated plants had a higher plant height, leaf area, collar diameter, number of main stems, number of nodes and leaf dry weight. Severe defoliation (50%) reduced most above traits in comparison with those of the controls. Furthermore, plant fresh and dry weights were the only parameters that were influenced by the interaction of these two treatments in which the highest fresh and dry weights were observed in the undefoliated plants that were treated with vermicompost. None of the treatments affected total leaf alkaloid. The mycorrhizal-treated plants displayed a root colonisation of 72%, compared to 5% for the control plants. Root fresh and dry weight was also higher in mycorrhizal plants than in every other plant.
Authors and Affiliations
Leila Tabrizi, Mohammad Hadi Mahdipour, Elham Azizi
Keywords
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