{"id":1261,"date":"2024-10-20T19:47:47","date_gmt":"2024-10-20T10:47:47","guid":{"rendered":"https:\/\/www.nibb.ac.jp\/plantdic\/blog\/?p=1261"},"modified":"2024-10-20T19:50:53","modified_gmt":"2024-10-20T10:50:53","slug":"%e3%83%9e%e3%83%ab%e3%83%90%e3%83%9e%e3%83%b3%e3%83%8d%e3%83%b3%e3%82%b0%e3%82%b5%e3%81%ae%e5%a5%87%e5%a6%99%e3%81%aa%e3%82%b7%e3%83%a5%e3%83%bc%e3%83%88%e6%a7%8b%e9%80%a0-curious-shoot-structure-of-s","status":"publish","type":"post","link":"http:\/\/www.nibb.ac.jp\/plantdic\/blog\/?p=1261","title":{"rendered":"\u30de\u30eb\u30d0\u30de\u30f3\u30cd\u30f3\u30b0\u30b5\u306e\u5947\u5999\u306a\u30b7\u30e5\u30fc\u30c8\u69cb\u9020 Curious shoot structure of Sedum makinoi"},"content":{"rendered":"\n
\"\"<\/a>
\u30de\u30eb\u30d0\u30de\u30f3\u30cd\u30f3\u30b0\u30b5\u306e\u30b7\u30e5\u30fc\u30c8\u3068\u82b1\u5e8f\u69cb\u9020
Shoot and inflorescence structure of Sedum makinoi<\/em><\/figcaption><\/figure>\n\n\n\n

\u30de\u30eb\u30d0\u30de\u30f3\u30cd\u30f3\u30b0\u30b5\u306e\u82b1\u5e8f\u306f\u5947\u5999\u306a\u69cb\u9020\u3092\u3057\u3066\u3044\u308b\uff08\u9091\u7530 2024)\u3002\u6804\u990a\u6210\u9577\u671f\u306f\u8449\u3092\u5341\u5b57\u5bfe\u751f\u3059\u308b\uff081\uff09\u3002\u751f\u6b96\u671f\u306b\u306a\u308b\u3068\u3001\u830e\u9802\u5206\u88c2\u7d44\u7e54\u306f\u82b1\u539f\u57fa\u3068\u306a\u308a\u82b1\uff082\uff09\u3092\u5f62\u6210\u3059\u308b\u3002\u305d\u3057\u3066\u3001\u82b1\u306e\u4e0b\u5074\u304b\u3064\u3001\u82b1\u306e\u76f4\u4e0b\u306e\u5bfe\u751f\u8449\uff083\uff09\u306890\u5ea6\u305a\u308c\u305f\u5341\u5b57\u5bfe\u751f\u306b\u306a\u308b\u65b9\u5411\u3078\uff12\u672c\u306e\u679d\uff084\uff09\u3092\u51fa\u3059\u3002\u679d\u306e\u5148\u306b\u306f\u8449\uff085\uff09\u304c\uff11\u679a\u3042\u308a\u3001\u305d\u306e\u8449\u814b\u306b\u82b1\uff086\uff09\u304c\u3067\u304d\u308b\u3002\u3053\u306e\u8449\uff085\uff09\u3068\u82b1\uff086\uff09\u306e\u9593\u304b\u3089\u8449\uff085\uff09\u3068\u5341\u5b57\u5bfe\u751f\u306e\u65b9\u5411\u306b\u679d\uff087\uff09\u304c\u51fa\u308b\u3002\u4ee5\u4e0a\u3092\u6b21\u3005\u306b\u7e70\u308a\u8fd4\u3057\u3001\u82b1\u5e8f\u304c\u3067\u304d\u3066\u3044\u304f\u3002<\/p>\n\n\n\n

 \u88ab\u5b50\u690d\u7269\u306f\u80da\u767a\u751f\u521d\u671f\u306b\u830e\u9802\u5206\u88c2\u7d44\u7e54\u304c\u3067\u304d\u3001\u305d\u306e\u5f8c\u306f\u3001\u8449\u814b\u306b\u65b0\u3057\u3044\u830e\u9802\u5206\u88c2\u7d44\u7e54\u304c\u3067\u304d\u3001\u679d\u3068\u306a\u308b\u3002\u8449\u814b\u306b\u3067\u304d\u308b\u65b0\u3057\u3044\u5206\u88c2\u7d44\u7e54\uff08\u814b\u82bd\u539f\u57fa\uff09\u306f\u3001\u830e\u9802\u5206\u88c2\u7d44\u7e54\u3068\u8449\u306e\u76f8\u4e92\u4f5c\u7528\u306b\u3088\u3063\u3066\u3067\u304d\u308b\uff08\u7dcf\u8aac\u3068\u3057\u3066Wang and Jiao 2018, Nicolas and Laufs 2022\uff09\u3002\u305d\u306e\u305f\u3081\u304b\u3001\u88ab\u5b50\u690d\u7269\u306e99%\u4ee5\u4e0a\u306e\u7a2e\u3067\u3001\u6210\u9577\u9014\u4e2d\u306b\u50b7\u5bb3\u306a\u3069\u3092\u53d7\u3051\u306a\u3051\u308c\u3070\u3001\u8449\u814b\u4ee5\u5916\u306b\u65b0\u3057\u3044\u830e\u9802\u5206\u88c2\u7d44\u7e54\u304c\u5f62\u6210\u3055\u308c\u308b\u3053\u3068\u306f\u306a\u3044\u3002\u30de\u30eb\u30d0\u30de\u30f3\u30cd\u30f3\u30b0\u30b5\u306e\u5834\u5408\u3001\u8449\u306e\u7121\u3044\u3068\u3053\u308d\u304b\u3089\u679d\uff084\u3084\uff17\uff09\u304c\u51fa\u3066\u3044\u308b\u70b9\u304c\u5947\u5999\u3067\u3042\u308b\u3002<\/p>\n\n\n\n

The inflorescences of Sedum makinoi<\/em> have a peculiar structure (Murata 2024 in Japanese). During the vegetative phase, the leaves are arranged in an opposite decussate phyllotaxis (1). When entering the reproductive phase, the apical meristem differentiates into a floral primordium and forms a flower (2). Between the flower and immediately below opposite leaves (3), branches (4) emerge oppositely to the leaves. At the tip of the branch, there is a single leaf (5), and in the axil of this leaf, a flower (6) forms. From between this leaf (5) and the flower (6), branches (7) grow out in the opposite decussate direction relative to the leaf (5). This process is repeated sequentially, forming the curious inflorescence. <\/p>\n\n\n\n

In angiosperms, a shoot apical meristem is formed during early embryogenesis, and later, new shoot apical meristems are formed in the leaf axils, giving rise to branches. The new meristem that forms in the leaf axils (axillary meristem primordia) is generated through the interaction between the shoot apical meristem and the leaves (reviewed in Wang and Jiao 2018, Nicolas and Laufs 2022). As a result, in over 99% of angiosperm species, new apical meristems are not formed outside of leaf axils unless the plant is damaged during growth. In the case of Sedum makinoi<\/em>, it is peculiar that branches (4 and 7) emerge from areas where there are no leaves.<\/p>\n\n\n\n

\"\"<\/a>
\u30de\u30eb\u30d0\u30de\u30f3\u30cd\u30f3\u30b0\u30b5\u306e\u82b1\u5e8f\u5f62\u6210\u6a5f\u69cb\u306e\u4eee\u8aac
Hypothesis on the inflorescence development of Sedum makinoi<\/em><\/figcaption><\/figure>\n\n\n\n

\u88ab\u5b50\u690d\u7269\u306e\u4e00\u898b\u5947\u5999\u306b\u898b\u3048\u308b\u5f62\u614b\u306f\u3001\u591a\u304f\u306e\u5834\u5408\u3001\u504f\u5dee\u6210\u9577\u3067\u8aac\u660e\u3067\u304d\u308b\u3002\u504f\u5dee\u6210\u9577\u3068\u306f\u3001\u4f53\u3068\u7279\u5b9a\u306e\u5834\u6240\u304c\u4ed6\u306e\u5834\u6240\u3068\u7570\u306a\u3063\u3066\u6210\u9577\u3059\u308b\u3053\u3068\u3067\u3042\u308b\u3002\u30de\u30eb\u30d0\u30de\u30f3\u30cd\u30f3\u30b0\u30b5\u306e\u5947\u5999\u306a\u82b1\u5e8f\u3082\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3001\u8449\u539f\u57fa\u3068\u305d\u306e\u814b\u82bd\u3092\u3042\u308f\u305b\u3066\u4ed8\u3051\u6839\u90e8\u5206\u304c\u504f\u5dee\u6210\u9577\u3057\u3066\u3044\u308b\u3068\u8003\u3048\u308b\u3068\u3046\u307e\u304f\u8aac\u660e\u3067\u304d\u308b\u3002<\/p>\n\n\n\n

\u901a\u5e38\u306e\u88ab\u5b50\u690d\u7269\u306f\u3001\u830e\u9802\u304c\u307b\u307c\u5747\u7b49\u306b\u6210\u9577\u3059\u308b\u3068\u8003\u3048\u3089\u308c\u308b\uff08a\uff09\u3002\u4e00\u65b9\u3001\u30de\u30eb\u30d0\u30de\u30f3\u30cd\u30f3\u30b0\u30b5\u3067\u306f\u3001\u8449\u3068\u814b\u82bd\u306e\u4ed8\u3051\u6839\u90e8\u5206\u304c\u4ed6\u306e\u90e8\u5206\u3088\u308a\u3082\u4f38\u9577\u3059\u308b\u305f\u3081\uff08b\uff09\u3001\uff11\u679a\u306e\u8449\u539f\u57fa\uff08c\uff09\u3068\u305d\u306e\u814b\u82bd\uff08d\uff09\u3092\u542b\u3093\u3060\u90e8\u5206\u304c\u679d\u3068\u306a\u3063\u3066\u4f38\u3073\u3060\u3059\uff08e\uff09\u3002\u8449\u539f\u57fa\u306f\u8449\uff08\u201dC\u201d\uff09\u3068\u306a\u308b\u3002\u814b\u82bd\uff08d\uff09\u306f\u3001\u524d\u306e\u30b7\u30e5\u30fc\u30c8\u3068\u540c\u3058\u3088\u3046\u306b\u3001\u672b\u7aef\u306b\u82b1\uff08f\uff09\u3092\u4ed8\u3051\u3001\u305d\u306e\u4e0b\u306e\u5bfe\u751f\u3059\u308b\u8449\u539f\u57fa\uff08g\uff09\u3068\u814b\u82bd\uff08h\uff09\u306e\u4ed8\u3051\u6839\uff08i\uff09\u304c\u4f38\u9577\u3059\u308b\uff08D\uff09\u3002\u3053\u308c\u3092\u7e70\u308a\u8fd4\u3059\u3068\u3001\u30de\u30eb\u30d0\u30de\u30f3\u30cd\u30f3\u30b0\u30b5\u306e\u82b1\u5e8f\u5f62\u614b\u3068\u540c\u3058\u5f62\u614b\u304c\u3067\u304d\u308b\u3002\u4e00\u898b\u3001\u5947\u5999\u306a\u30de\u30eb\u30d0\u30de\u30f3\u30cd\u30f3\u30b0\u30b5\u306e\u82b1\u5e8f\u3067\u3042\u308b\u304c\u3001\u8449\u539f\u57fa\u3068\u8449\u814b\u306e\u4ed8\u3051\u6839\u304c\u504f\u5dee\u6210\u9577\u3059\u308b\u3068\u3044\u3046\u3001\u5358\u7d14\u306a\u5909\u5316\u306b\u3088\u3063\u3066\u3001\u9032\u5316\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u306a\u3088\u3046\u306b\u601d\u308f\u308c\u308b\u3002\u82b1\u5e8f\u5f62\u6210\u6642\u306b\u3069\u3053\u3067\u504f\u5dee\u6210\u9577\u304c\u8d77\u3053\u3063\u3066\u3044\u308b\u304b\u3092\u8abf\u3079\u308c\u3070\u3001\u3053\u306e\u4eee\u8aac\u3092\u691c\u8a3c\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3060\u308d\u3046\u3002<\/p>\n\n\n\n

The seemingly peculiar morphology of angiosperms can often be explained by anisotropic growth. Anisotropic growth refers to the growth of specific regions of the plant at a rate or manner different from other regions. The unusual inflorescence of Sedum makinoi<\/em> can be effectively explained by considering that the base region, including the leaf primordium and its axillary meristem, undergoes differential growth as described below. <\/p>\n\n\n\n

In regular angiosperms, it appears that the apical region grows almost uniformly (a). However, in Sedum makinoi<\/em>, the base of the leaf and its axillary meristem primordium elongates more than other regions (b), causing the portion that includes a single leaf primordium (c) and its axillary meristem (d) to extend and forms a branch (e). The leaf primordium develops into a leaf (“C”). The axillary meristem (d) forms\u00a0 opposite leaf primordia, their axillary meristem, and a terminal flower (f) just like in the previous shoot. The base (i) of the leaf primordia (g) and axillary meristem primordia (h) elongates (D). Repeating this process results in the inflorescence morphology characteristic of <\/em><\/strong>Sedum makinoi<\/em>. Although the inflorescence of Sedum makinoi<\/em> may seem peculiar at first glance, it appears that this morphology could have evolved through a simple modification\u2014anisotropic growth at the base of the leaf primordia and the axillary region. Investigating where anisotropic growth occurs during inflorescence formation would allow us to test this hypothesis.<\/p>\n\n\n\n

\u5f15\u7528\u6587\u732e Reference<\/p>\n\n\n\n

\u9091\u7530\u4ec1. 2024. \u3044\u308d\u3044\u308d\u306a\u690d\u7269\u3067\u898b\u3089\u308c\u308b\u30de\u30f3\u30cd\u30f3\u30b0\u30b5\u578b\u306e\u82b1\u5e8f\u5f62\u614b. \u690d\u7269\u306e\u53cb 8: 3-4.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u30de\u30eb\u30d0\u30de\u30f3\u30cd\u30f3\u30b0\u30b5\u306e\u82b1\u5e8f\u306f\u5947\u5999\u306a\u69cb\u9020\u3092\u3057\u3066\u3044\u308b\uff08\u9091\u7530 2024)\u3002\u6804\u990a\u6210\u9577\u671f\u306f\u8449 … \u7d9a\u304d\u3092\u8aad\u3080 →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[61,124,1],"tags":[],"_links":{"self":[{"href":"http:\/\/www.nibb.ac.jp\/plantdic\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1261"}],"collection":[{"href":"http:\/\/www.nibb.ac.jp\/plantdic\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.nibb.ac.jp\/plantdic\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.nibb.ac.jp\/plantdic\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.nibb.ac.jp\/plantdic\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1261"}],"version-history":[{"count":2,"href":"http:\/\/www.nibb.ac.jp\/plantdic\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1261\/revisions"}],"predecessor-version":[{"id":1266,"href":"http:\/\/www.nibb.ac.jp\/plantdic\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1261\/revisions\/1266"}],"wp:attachment":[{"href":"http:\/\/www.nibb.ac.jp\/plantdic\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1261"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.nibb.ac.jp\/plantdic\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1261"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.nibb.ac.jp\/plantdic\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1261"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}