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A Visual Guide to Collecting Plant Tissues for DNA

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A Visual Guide to Collecting Plant Tissues for DNA A visual guide to collecting plant tissues for DNA Collecting kit checklist Silica gel1 Permanent marker and pencil Resealable bags, airtight plastic container Razor blade / Surgical scissors Empty tea bags or coffee filters Ethanol and paper tissue or ethanol wipes Tags or jewellers tags Plant press and collecting book 1. Selection and preparation of fresh plant tissue: Sampling avoided. Breaking up leaf material will bruise the plant tissue, which will result in enzymes being released From a single plant, harvest 3 – 5 mature leaves, or that cause DNA degradation. Ideally, leaf material sample a piece of a leaf, if large (Picture A). Ideally should be cut into smaller fragments with thick a leaf area of 5 – 10 cm2 should be enough, but this midribs being removed (Picture C). If sampling robust amount should be adjusted if the plant material is leaf tissue (e.g. cycads, palms), use a razor blade or rich in water (e.g. a succulent plant). If leaves are surgical scissors (Picture D). small (e.g. ericoid leaves), sample enough material to equate a leaf area of 5 – 10 cm2. If no leaves are Succulent plants available, other parts can be sampled such as leaf buds, flowers, bracts, seeds or even fresh bark. If the If the leaves are succulent, use a razor blade to plant is small, select the biggest specimen, but never remove epidermal slices or scoop out parenchyma combine tissues from different individuals. tissue (Picture E). Cleaning Ideally, collect clean fresh tissues, however if the leaf or plant material is dirty or shows potential contamination (e.g. aphids, mycelium etc.), clean it using an ethanol wipe (Picture B). Preparing material The leaf material must be dried as quickly as possible to preserve the quality of the DNA. If leaves are large or very fleshy, cutting them into smaller fragments will speed up the drying process. On the other hand if the leaves are not big or fleshy, fragmentation should be C D A B E A quick and visual collecting protocol for plant tissue sampling 2. Drying out the plant tissue Several methods using silica gel have proven to be gel (Picture G). When a tea bag or coffee filter is not efficient at drying plant tissue in a short time. Here used, recovering leaves from the silica gel back in the we present two alternatives using silica gel: (1) in laboratory may be difficult if the leaves are fragmented single airtight bags or (2) in airtight plastic containers. during transport/storage. In both cases we recommend the use of tea bags or coffee filters to make downstream handling easier. Method 2 (airtight plastic container) Leaves or leaf fragments placed within a tea bag or Method 1 (resealable bag) coffee filter should be closed using a paper clip to One resealable bag is filled with approximately ensure that the plant material remains in the filter. 30 – 60g of the silica gel mixture described1. Tissues The filter is then transferred into an airtight plastic previously prepared are placed in a tea bag or coffee container filled with silica gel (Picture H). The silica gel filter (Picture F) and then transferred into the plastic should at least partially cover the bag(s) which can be bag. Leaves can also be directly placed into the silica achieved easily by turning the box upside down. F G H 3. Storing plant tissue Whichever method is used, resealable bags and glassine envelopes or kept in the tea bag or coffee airtight plastic containers must remain open for as filter, then transferred into individual resealable bags short a time as possible so that the silica gel does with a small amount of indicator silica gel, which will not lose its desiccating properties. Silica gel indicator keep the material dry and enable one to monitor the will change colour when rendered inefficient, alerting collections. the user to the fact that the silica gel will need to be replaced, especially if samples are not yet dry. Labelling and tracking the collections Proper labelling of the collections is critical. Here Long-term storage we suggest that a tag with a pencil-written collecting When the plant material is fully dried (i.e. has number is included in each resealable bag or filter, become brittle), generally after 24 to a maximum and that the same reference is annotated on the final of 48 hours, it can be transferred into un-buffered resealable bag. 4. Additional information to be 1 Ideal properties/composition of silica mix: below 22A° (28 – 200 mesh) silica gel mixed with moisture-indicating associated with the tissue collection: silica gel, containing a moisture indicator dye changing from coloured (generally blue and orange) to colourless. Herbarium sample Note: Silica gel can be re-used but it requires caution in An herbarium voucher should always be collected in order to avoid contamination from fragments remaining from association with each tissue collection using the same previously collected tissue. reference number used above. In some cases, one or For further details and storage of Cucurbitales squash Dipsacales SU Fagales honeysuckles PE S oaks RA ID Paracryphiales S S Rosales Apiales T a series of photographs highlighting the various plant O carrots E your collected material please roses R R I R D E Bruniales S P Fabales Aquifoliales U Brassicales beans holly S cabbages Asterales daisies Solanales identification features may be sufficient. contact a member of the DNA tomatoes Malvales Sapindales maples Oxalidales hibiscus wood sorrel Escalloniales Lamiales Metteniusales mints and Tissue Bank team – Crossosomatales Malpighiales Vahliales violets Ericales Huerteales primulas Gentianales Picramniales Celastrales Garryales coffee Caryophyllales Additional collection information Myrtales Icacinales [email protected]. cacti Boraginales pomegranates Vitales Zygophyllales forget-me-nots grapes Berberidopsidales Geraniales Cornales geraniums Saxifragales hydrangeas peonies Any additional data related to a collection should be Santalales Cite as: Maurin, O. , Epitawalage, N., mistletoes OTS OC Zingiberales Dilleniales N bananas recorded in a collecting book and/or digitally. The Eiserhardt, W., Forest, F., Fulcher, T. O Commelinales EARLY DI M day flowers VERGING EUDICO Arecales Gunnerales TS palms gunnera Buxales box Poales and Baker, W.J. 2017. A visual guide Trochodendrales grasses minimum data required are: Proteales lotus Asparagales Ranunculales to collecting plant tissues for DNA. Liliales irises poppies lilies Ceratophyllales Dioscoreales yams Royal Botanic Gardens, Kew. Chloranthales Petrosaviales Austrobaileyales Pandanales Field identification or final taxonomic identification Acorales Nymphaeales screw pines Alismatales waterlilies • aroids Amborellales Magnoliales magnolias Collector’s name and number Ginkgoales ginkgo Cycadales Pinales Canellales cycads pines • M Laurales Cupressales A laurels Piperales redwoods S G M N black pepper Lycophyta Date of collection R Text and Photographs: Olivier Maurin, OL lycopods Araucariales IIDS monkey puzzles E • Monilophyta P ferns Gnetales S tree tumbo O Niroshini Epitawalage, Wolf Eiserhardt, N Locality information, including GPS data if available Bryophyta GYM mosses Zygnematales • Marchantiophyta green algae Felix Forest, Tim Fulcher and the DNA and liverworts Anthocerotophyta • Type of material sampled Tissue Bank team, William Baker. hornworts Design: RBG Kew Design Studio THE PLANT TREE OF LIFE.
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