Department of Horticulture, Faculty of Agriculture, University of Tabriz , Tabriz, Iran.
Leibniz Institute for Vegetable and Ornamental Crops. Theodor-Echtermeyer-Weg 1, 14979 Großbeeren, Germany.
J Agric Food Chem. 2016 Jan 13;64(1):71-7. doi: 10.1021/acs.jafc.5b04791. Epub 2016 Jan 4.
The objective of this study was to investigate the impact of mycorrhizal symbiosis on qualitative characteristics of onion (Allium cepa L.). For this reason, five onion cultivars with different scale color and three different strains of arbuscular mycorrhizal fungi (Diversispora versiformis, Rhizophagus intraradices, Funneliformis mosseae) were used. Red cultivars, mainly 'Red Azar-shahr', showed the highest content in vitamin C, flavonols, and antioxidant enzymes. Mycorrhizal inoculation increased total phenolic, pyruvic acid, and vitamin C of onion plants. Considerable increase was observed in quercetin-4'-O-monoglucoside and isorhamnetin-4'-O-monoglucoside content in plants inoculated with Diversispora versiformis, but quercetin-3,4'-O-diglucoside was not significantly influenced. Analyses for phenylalanine ammonia-lyase (PAL) and antioxiodant enzyme activities such as polyphenol oxidase (PPO), catalase (CAT), and peroxidase (POD) revealed that all except PPO were enhanced by mycorrhizal inoculation. Overall, these findings suggested that mycorrhizal inoculation influenced biosynthesis of flavonol glucosides and antioxidant enzymes by increasing nutrient uptake or by induction of the plant defense system.
本研究旨在探讨菌根共生对洋葱（Allium cepa L.）品质特性的影响。为此，使用了 5 个具有不同鳞茎颜色的洋葱品种和 3 种不同的丛枝菌根真菌（Diversispora versiformis、Rhizophagus intraradices、Funneliformis mosseae）。红色品种，主要是‘Red Azar-shahr’，表现出最高的维生素 C、类黄酮和抗氧化酶含量。菌根接种增加了洋葱植物的总酚、丙酮酸和维生素 C。接种 Diversispora versiformis 的植物中观察到槲皮素-4'-O-单葡萄糖苷和异鼠李素-4'-O-单葡萄糖苷含量显著增加，但槲皮素-3,4'-O-二葡萄糖苷没有明显影响。苯丙氨酸解氨酶（PAL）和抗氧化酶活性（如多酚氧化酶（PPO）、过氧化氢酶（CAT）和过氧化物酶（POD））的分析表明，除了 PPO 之外，所有这些酶都被菌根接种所增强。总的来说，这些发现表明，菌根接种通过增加养分吸收或诱导植物防御系统来影响类黄酮葡萄糖苷和抗氧化酶的生物合成。
