期刊
APPLIED SOIL ECOLOGY
卷 72, 期 -, 页码 187-194出版社
ELSEVIER
DOI: 10.1016/j.apsoil.2013.07.003
关键词
Stevia rebaudiana; Arbuscular mycorrhizal fungi; Stevioside and rebaudioside-A; Phosphorus fertiliser; Jasmonic acid
类别
资金
- Department of Biotechnology, New Delhi
- Council of Scientific and Industrial Research (CSIR)
The sweet herb of Paraguay, Stevia rebaudiana (Bertoni), is becoming more important worldwide in herbal care for diabetes, as it produces the zero-calorie sweeteners steviol glycosides (SGs) stevioside and rebaudioside-A. While arbuscular mycorrhizal fungi (AMF) have been shown to enhance production of secondary metabolites in many plant species, their effect on S. rebaudiana has not been studied. Moreover, relatively little is known about the mechanisms that may be involved in the increased accumulation of phytochemicals in mycorrhizal plants. Therefore, this study was performed to test the ability of Rhizophagus fasciculatus (Thaxt.) C. Walker & A. Schaler to improve the yield of SGs in S. rebaudiana and to relate this with some AMF-induced physiological changes in addition to improved phosphorus (P) uptake. The performance of plants inoculated with R. fasciculatus was compared with that of non-mycorrhizal plants with similar P concentrations. Mycorrhizal (M) and non-mycorrhizal plants with P-supplementation (NM + P) produced higher concentrations of SGs compared with control plants. However, M plants had more SGs than did NM + P plants. The higher content of SGs in M plants is due to increased concentrations of SGs and to the enhanced biomass of the shoots. The increase in biomass is directly due to the improved uptake of nutrients (N, K, Mg, Cu, Fe, Mn and Zn), and chlorophyll and carbohydrate concentrations in M plants. Higher concentrations of total carbohydrates and jasmonic acid in M plants than in NM + P plants contribute to more biosynthesis of SGs via the methyl erythritol phosphate pathway. This study suggests that AMF-mediated increases in SGs involve both nutritionally and non-nutritionally linked mechanisms. (C) 2013 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据