Spirina Ulyana N, Voronkova Tatiana V, Ignatov Michael S
Faculty of Biology, Tver State University, Tver, Russia.
Tsitsin Main Botanical Garden, Russian Academy of Sciences, Moscow, Russia.
Front Plant Sci. 2020 Jun 19;11:858. doi: 10.3389/fpls.2020.00858. eCollection 2020.
Moss paraphyllia, the trichome-like or foliose structures on moss stem surfaces, are usually treated as epidermal outgrowths. However, in some taxa of the moss families Leskeaceae, Neckeraceae, and Amblystegiaceae their distribution along the stem is consistently correlated with parts of the stem surface near branch primordia. In other moss families, Climaciaceae, Hylocomiaceae, and Pseudoleskeaceae the specific paraphyllia-generating epidermal layer produces paraphyllia evenly all along the stem. These results suggest that there are at least two different types of regulation of paraphyllia development; however, both of them may be involved in the morphogenesis of paraphyllia in some families, for example in the Thuidiaceae. Exogenous abscisic acid treatment consistently increases the number of paraphyllia of the -type, and it also induces the development of proximal branch leaves that normally do not develop a lamina above the stem surface. This fact supports conclusions regarding the homology of the -type of paraphyllia with leaves.
藓类叶状体，即藓类茎表面的毛状体状或叶状结构，通常被视为表皮的衍生物。然而，在藓类植物科、平藓科和柳叶藓科的一些分类群中，它们沿茎的分布始终与靠近枝原基的茎表面部分相关。在其他藓类植物科，如万年藓科、塔藓科和拟平藓科中，特定产生叶状体的表皮层沿茎均匀地产生叶状体。这些结果表明，叶状体发育至少存在两种不同类型的调控；然而，在某些科，例如羽藓科中，这两种调控可能都参与了叶状体的形态发生。外源脱落酸处理持续增加 - 型叶状体的数量，并且还诱导近端枝叶的发育，这些枝叶通常在茎表面上方不会发育出叶片。这一事实支持了关于 - 型叶状体与叶同源性的结论。
