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Identification of Poisonous Plants by DNA Barcoding Approach

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Identification of Poisonous Plants by DNA Barcoding Approach Int J Legal Med (2010) 124:595–603 DOI 10.1007/s00414-010-0447-3 ORIGINAL ARTICLE Identification of poisonous plants by DNA barcoding approach Ilaria Bruni & Fabrizio De Mattia & Andrea Galimberti & Gabriele Galasso & Enrico Banfi & Maurizio Casiraghi & Massimo Labra Received: 22 January 2010 /Accepted: 9 March 2010 /Published online: 31 March 2010 # Springer-Verlag 2010 Abstract The plant exposures are one of the most agreement with CBOL Plant Working Group, we selected frequent poisonings reported to poison control centres. matK as the best marker, because trnH-psbA showed some The diagnosis of intoxicated patients is usually based on problems in sequences sizes and alignments. As a final and the morphological analysis of ingested plant portions; relevant observation, we also propose the combination of this procedure requires experience in systematic botany, matK with a nuclear marker such as At103 to distinguish toxic because the plant identification is based on few evident hybrids form parental species. In conclusion, our data support traits. The objective of this research is to test DNA the claim that DNA barcoding is a powerful tool for poisonous barcoding approach as a new universal tool to identify plant identifications. toxic plants univocally and rapidly. Five DNA barcode regions were evaluated: three cpDNA sequences (trnH- Keywords DNA barcoding . Poisonous plants . matK . psbA, rpoB and matK) and two nuclear regions (At103 trnH-psbA . rpoB . At103 . sqd1 and sqd1). The performance of these markers was evaluated in three plant groups: (1) a large collection of angiosperms containing different toxic substances, (2) Introduction congeneric species showing different degrees of toxicity and (3) congeneric edible and poisonous plants. Based The human diet includes a lot of domesticated plant species on assessments of PCR, sequence quality and resolution (for instance Hordeum vulgare L., Zea mays L., Oryza power in species discrimination, we recommend the sativa L., etc.) derived from an evolutionary continuum of combination of plastidial and nuclear markers to identify people–plants interactions, leading to plants showing higher toxic plants. Concerning plastidial markers, matK and trnH- yield, easier cultivation and detoxification from natural psbA showed consistent genetic variability. However, in poisonous metabolites [37]. Since the beginning of the domestication, around 10,000 years ago, plants and derived Electronic supplementary material The online version of this article were also used in medicine, and in the last years, the (doi:10.1007/s00414-010-0447-3) contains supplementary material, nutritional therapies and phytotherapy have emerged as new which is available to authorized users. concepts and healing systems. However, several spontane- I. Bruni : F. De Mattia : A. Galimberti : M. Casiraghi : ous plants are potentially toxic for human beings [27, 32, M. Labra (*) 34, 36]. The accidental ingestion of toxic plant portions (for ZooPlantLab, Dipartimento di Biotecnologie e Bioscienze, instance seed, fruit, root, etc.) can cause severe poisoning or Università degli Studi di Milano-Bicocca, even death [24, 34]. In the last years, the plant exposures Piazza della Scienza 2, 20126 Milan, Italy are among the most frequent poisoning cases reported by e-mail: [email protected] poison control centres [25]. Exposures to plants containing : oxalate crystals, such as Philodendron and Dieffenbachia, G. Galasso E. Banfi are one of the most common toxic plant exposures reported Museo di Storia Naturale di Milano, Corso Venezia 55, in the USA [1]. The same toxic compounds were also 20121 Milan, Italy present in several African species such as Dieffenbachia 596 Int J Legal Med (2010) 124:595–603 amoena, Alocasia macrorrhiza and Monstera deliciosa [8] identify the ingested plants univocally and to define the and in spontaneous or ornamental plant from other suitable medical treatments rapidly. countries. To further complicate the picture, the amount of poison in a plant tends to vary with location, age of the plant, season and weather conditions [10, 18, 35]. Materials and methods The clinical diagnosis of intoxicated patients is typically based on the morphological analysis of plant fragments in Taxonomic sampling the stomach contents [20]. This method is very tedious to perform, requires a considerable amount of training and A total of 50 land-plant species showing different poisonous usually a variable proportion of plant fragments remains substances was selected to test the performance of different unidentifiable. In addition, the plant species identifications candidate genomic regions for DNA barcoding analyses can be difficult without residuals showing distinctive empirically. A complete list of investigated species is given taxonomic elements. Recently, a new technique for plant in Table 1. Our sampling strategy was designed to have identification based on the analysis of a short, standardised sufficient density of sampling within angiosperm, such that DNA region known as “DNA barcoding” ([13]; www. sets of closely related species are included as well as plants barcoding.si.edu) has been proposed. The basic idea of the of divergent genera or families. Our taxon set was divided in discrimination system is simple: the sequence variation of three groups. the DNA barcode must be high enough between species, so that they can be discriminated from one another. In practice, Group I: Hornamental plants as well as spontaneous plants a DNA sequence from such a standardised DNA region can containing different toxic substances (Table 1) Several of be generated from a small tissue sample taken from an these show attractive poisonous portions such as fruits or unidentified organism and can be compared to a library of flowers, and these are accidentally eaten, mainly by reference sequences from described species. A match of the children. If the amount of ingested poisonous substance sequence from the unknown organism to one of the reaches significant levels in the body, clear symptoms of reference sequences can provide a rapid and reproducible poisoning were highlighted. These samples were selected, identification [2, 13]. because they represent a diverse set of species across the However, the selection of a barcode locus is complicated angiosperms (including monocots and eudicots) with by the trade-off that arises between the need for universal various levels of phylogenetic distance. This provides a application and maximal rates of sequence divergence [17]. sound assessment of universality of the tested DNA A portion of the mitochondrial coxI (cytochrome c oxidase barcoding markers. subunit 1) gene was largely applied as DNA barcode Considering that the goal of our work is to set up a sequence for animal identification [13], but in land plants, practical DNA barcoding approach suitable to identify this sequence is highly invariant and therefore unsuitable poisonous plants starting from a small portion accidentally for use as DNA barcodes. Several alternative regions have eaten, in this group, DNA was extracted from standard been proposed, such as the plastidial conserved rpoB, materials, such as leaves, and also from fruits-seeds that rpoC1, rbcL and matK genes, several intergenic plastidial represented the accidentally eaten poisonous structures spacers (trnH-psbA, atpF-atpH and psbK-psbI) and the (Table 1). nuclear internal transcribed spacers [3, 9, 17]. A lot of research groups have proposed different combinations of Group II: Phylogenetically related plants showing different these loci to increase the efficiency in species identification, poisonous portions and degrees of toxicity were selected to especially for the critical groups [30]. However, both the evaluate the discriminating power of different DNA identity and the number of the most appropriate regions for barcoding markers among closely related taxa In this plant DNA barcoding remain contentious [14, 15]. group, species of the genera Aconitum (IIa) and Sambucus The objective of the current study is to evaluate the (IIb) were included. universal application of DNA barcoding approach to univocally identify toxic plants starting from different plant Group III: Congeneric edible and poisonous plant species In portions. In this study, we provide an evaluation of the the clinical diagnosis of intoxicated patients, it is very performance of five candidate barcoding loci on a selected important to distinguish fragments of edible plants from the group of poisonous plant species. The final objective is to poisonous species elements. For this reason, some species develop a rapid molecular tool for toxic plants identification of Solanum (group IIIa) and Prunus (group IIIb), two large starting from a small portion of plant tissue from different angiosperm genera constituted by edible and poisonous biological samples such as stomach contents and/or faeces plants, were analysed by different DNA barcoding markers. of patients. This tool could be useful for poison centres to The final goal was to test the power of DNA barcoding to Int J Legal Med (2010) 124:595 Table 1 List of analysed plants divided in different groups (Gr) (see “Materials and methods”) No. Gr V. N. Species Family Common name Poisonous organ Toxic substances DNA from 1 I MIB:zpl:01657 Nandina domestica Thunb. Berberidaceae Sacred Bamboo Fruit and other part Hydrocyanic acid and nandenine L–F 2 I MIB:zpl:01658 Ilex aquifolium L. Aquifoliaceae Holly Fruit, leaves and seed Theobromine, alkaloid and glucoside
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