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One role is to separate different cell groups, for example the differentiating cells of a leaf primordium from the pluripotent cells of the apical meristem. Boundary zones are also established during compound leaf development, to separate young leaflets from each other, and in many other positions of the plant body. Recent studies have demonstrated that different boundary zones share similar properties. They are characterized by a low rate of cell divisions and specific patterns of gene expression. In addition, the levels of the plant hormones auxin and brassinosteroids are down\u2010regulated in boundary zones, resulting in a low differentiation level of boundary cells. This feature seems to be crucial for a second important role of boundary zones, the formation of new meristems. The primary shoot meristem, as well as secondary and ectopic shoot meristems, initiate from boundary cells that exhibit competence for meristem formation.<\/jats:p><jats:p><jats:table-wrap position=\"anchor\">\n\n<jats:table frame=\"void\">\n<jats:col\/>\n<jats:col\/>\n<jats:col\/>\n<jats:thead>\n<jats:tr>\n<jats:th\/>\n<jats:th>Contents<\/jats:th>\n<jats:th\/>\n<\/jats:tr>\n<\/jats:thead>\n<jats:tbody>\n<jats:tr>\n<jats:td\/>\n<jats:td>Summary<\/jats:td>\n<jats:td>485<\/jats:td>\n<\/jats:tr>\n<jats:tr>\n<jats:td>I.<\/jats:td>\n<jats:td><jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"#nph13641-sec-0002\">Introduction<\/jats:ext-link><\/jats:td>\n<jats:td>485<\/jats:td>\n<\/jats:tr>\n<jats:tr>\n<jats:td>II.<\/jats:td>\n<jats:td><jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"#nph13641-sec-0003\">Development of boundary zones<\/jats:ext-link><\/jats:td>\n<jats:td>486<\/jats:td>\n<\/jats:tr>\n<jats:tr>\n<jats:td>III.<\/jats:td>\n<jats:td><jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"#nph13641-sec-0008\">Boundaries shape the leaf<\/jats:ext-link><\/jats:td>\n<jats:td>491<\/jats:td>\n<\/jats:tr>\n<jats:tr>\n<jats:td>IV.<\/jats:td>\n<jats:td><jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"#nph13641-sec-0009\">Boundary zones are launching pads for meristem formation<\/jats:ext-link><\/jats:td>\n<jats:td>491<\/jats:td>\n<\/jats:tr>\n<jats:tr>\n<jats:td>V.<\/jats:td>\n<jats:td><jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"#nph13641-sec-0013\">Conclusions\/future perspectives<\/jats:ext-link><\/jats:td>\n<jats:td>495<\/jats:td>\n<\/jats:tr>\n<jats:tr>\n<jats:td\/>\n<jats:td><jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"#nph13641-sec-0014\">Acknowledgements<\/jats:ext-link><\/jats:td>\n<jats:td>495<\/jats:td>\n<\/jats:tr>\n<jats:tr>\n<jats:td\/>\n<jats:td><jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"#nph13641-bibl-0001\">References<\/jats:ext-link><\/jats:td>\n<jats:td>495<\/jats:td>\n<\/jats:tr>\n<\/jats:tbody>\n<\/jats:table>\n\n<\/jats:table-wrap><\/jats:p>","DOI":"10.1111\/nph.13641","type":"journal-article","created":{"date-parts":[[2015,9,22]],"date-time":"2015-09-22T11:55:40Z","timestamp":1442922940000},"page":"485-498","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":106,"title":["<i>Divide et impera<\/i>: boundaries shape the plant body and initiate new meristems"],"prefix":"10.1111","volume":"209","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2912-1263","authenticated-orcid":false,"given":"Quan","family":"Wang","sequence":"first","affiliation":[{"name":"Department of Plant Breeding 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