Hanson Brady, Garifullina Gulnara F, Lindblom Stormy Dawn, Wangeline Ami, Ackley Ashley, Kramer Karen, Norton Andrew P, Lawrence Christopher B, Pilon-Smits Elizabeth A H
Department of Biology, Colorado State University, Anatomy/Zoology Building, Fort Collins, CO 80523.
These authors contributed equally to this work.
New Phytol. 2003 Aug;159(2):461-469. doi: 10.1046/j.1469-8137.2003.00786.x.
• Certain plant species hyperaccumulate selenium (Se) up to 0.6% of their dry weight. It is not known whether Se hyperaccumulation offers the plants any advantage. In this study the hypothesis was tested that Se can protect plants from invertebrate herbivory or fungal infection. • Indian mustard (Brassica juncea) plants grown with or without Se were subjected to herbivory by caterpillars (Pieris rapae) and snails (Mesodon ferrissi), or to fungal infection by a root/stem pathogen (Fusarium sp.) and a leaf pathogen (Alternaria brassicicola). • When given a choice between leaves with or without Se (0.1% Se of leaf d. wt), the caterpillars strongly preferred leaves without Se (P < 0.01), while the snails preferred leaves containing Se (P < 0.015). When consumed, the Se leaves were lethal to the caterpillars. The snails showed no toxicity symptoms, even though their tissue Se concentrations were comparable with the caterpillars. Se-containing plants were less susceptible to infection by both fungi. • In conclusion, Se was shown to protect Indian mustard plants from fungal infection and from herbivory by caterpillars, but not by snails.
• 某些植物物种能超积累硒（Se），其含量可达干重的0.6%。目前尚不清楚硒的超积累是否能给植物带来任何优势。在本研究中，对硒能否保护植物免受无脊椎动物食草或真菌感染这一假设进行了检验。
• 用含硒或不含硒的方式种植印度芥菜（Brassica juncea），使其遭受毛虫（粉纹夜蛾）和蜗牛（Mesodon ferrissi）的食草行为，或遭受根/茎病原体（镰刀菌属）和叶病原体（芸苔链格孢）的真菌感染。
• 当在含硒（叶片干重的0.1%硒）和不含硒的叶片之间进行选择时，毛虫强烈偏好不含硒的叶片（P < 0.01），而蜗牛则偏好含硒的叶片（P < 0.015）。食用后，含硒叶片对毛虫是致命的。蜗牛没有表现出毒性症状，尽管它们的组织硒浓度与毛虫相当。含硒植物对两种真菌的感染都较不敏感。
• 总之，硒被证明可以保护印度芥菜植物免受真菌感染和毛虫的食草行为，但不能保护其免受蜗牛的侵害。
