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. 2016 Aug 11;17:606. doi: 10.1186/s12864-016-2857-1

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Anatomical analysis of peanut pegs from four developmental stages. a Younger pegs with 2–3 mm in length (S0 pegs); b and c longitudinal section of S0 pegs (amplification: 40× and 400×, respectively); d green or purple aerial-grown pegs (S1 peg); e and f longitudinal section of S1 peg (amplification: 40× and 400×, respectively); g white pegs after soil penetration without pod enlargement (S2 peg); h and i longitudinal section of S2 peg (amplification: 40× and 400×, respectively); j pegs after soil penetration and pod enlargement (S3 peg); k and l longitudinal section of the swelling pod (amplification: 40× and 400×, respectively)