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Steviol Glycoside Content Dynamics during the Growth Cycle of Stevia rebaudiana Bert

American Journal of Plant Sciences 2018年第4期9卷 892-901页

作者： Ana Belen Guerrero Leticia San Emeterio itziar domeno Ignacio Irigoyen Julio Muro Departamento de Produccion Agrícola Universidad Publica de NavarraCampus de ArrosadiaPamplonaSpain Research Institute on Innovation&Sustainable Development in Food Chain(ISFood) Universidad Pública de NavarraCampus de ArrosadiaPamplonaSpain

The sweetener compounds in Stevia, steviol glycosides (SG), are mainly found in the leaves. The SG content depends on the plant’s growth stage and is usually highest just before flowering. In temperate areas, Stevia is a polyannual crop (5 - 7 years) with a vegetative period lasting from April-May until October, during which time the crop can be harvested two or three times. This research focuses on the need for knowledge about Stevia’s response to temperate climates in Southern Europe. Two field assays were established from June to October 2013 at two sites in Navarra (Spain). The biomass and content of the two major SG, stevioside (ST) and rebaudioside A (RA), were measured using High Performance Liquid Chromatography (HPLC) in 66 cloned plants, at different developmental stages. Although the results from the two sites showed different SG leaf content dynamics during the plant growth, the optimum harvest date at both sites coincided with the bud-flowering stage at the beginning of September (around 96 days after planting), when a ST yield of 27 g·m-2 was reached. These results show Stevia’s potential as a commercial crop for stevioside production in northern Spain.

关键词： Stevia rebaudiana Bert. Crop Stevioside Rebaudioside A Photoperiod

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Turning, Microbial Inoculation and Use of Eisenia foetida in Household Organic Waste Composting

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Journal of Agricultural Science and Technology(A) 2011年第5期1卷 734-738页

作者： I. lrigoyen F. Pacheco M. Sesma I. domeno F. Storino J. Muro B. Yaben S. Blazquez A. Amorena Department of Produccion Agraria Universidad Publica de Navarra Pamplona 31006 Spain Servicios de la Comarca de Pamplona SCPSA c/General Chinchilla n7 Pamplona 31002 Spain

On site composting of organic household wastes is an economical and environmentally tiiendly way to manage municipal wastes. In this manuscript authors evaluated the importance of turning the wastes and of inoculating microorganisms and worms in order to unprove the composting process at domestic scale. Four treatments （Control without turning- C-, Control with Turning- CT- inoculated Mountain Microorganism with turning- MM- and Worms without turning- W-） were tested in a random experiment with tour replicates. Sixteen composting bins were fed with 300 kg of organic wastes from a local street market. The process of compostnig lasted 13 weeks after which all the composts were sifted and submitted to a range of chemical, physical and biological analysis. According to the results MM slightly increased the initial temperature and enzymatic activiry. This investigation outcome don＇t provide of sufficient grounds for a precise recommendation about worms inoculation in compost bins. A decrease between 75% and 80% in the fresh weight of the organic waste was found in the first thirteen weeks after starting the composting process in all the treatments. The quality level of the compost was acceptable, with very low heavy metal content. Turn over helps to keep the product hygienic especially after the inoculation with MM microbial starts. In conclusion and according to the results of this investigation, the use of 320 L compost bins for the organic waste management is strongly advisable.

关键词： Home composting microbial inoculation vermicompost worms compost.

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