Floral development at multiple spatial scales in Polygonum jucundum (Polygonaceae), a distylous species with broadly open flowers.
Floral development at multiple spatial scales in Polygonum jucundum (Polygonaceae), a distylous species with broadly open flowers.
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蓼科 (Polygonaceae) 花大开放的二柱物种的多空间尺度的花发育
DOI：
10.1371/journal.pone.0102802
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Wang XF
中科院分区：
文献类型：
--
作者：
Huang LJ;Fu WL;Wang XF
双花柱是被子植物中一种特殊的多型体，自达尔文时代起就引起了人们的注意。对二柱分类群的发育研究有助于我们理解这种多型体的进化过程，但这些研究大多集中在具有狭管状花冠的物种上。在这里，我们研究了花发育的蓼，一个二型物种，广泛开放的花朵，在多个空间尺度。结果表明，在整个花发育过程中，花柱生长的差异是导致两种类型花柱头高度差异的主要原因。观察到的差异花药高度之间的两个变种是因为在花发育后期的花丝生长速度在短花柱（SS）比长花柱（LS）。此外，LS花的花柱比SS花的长是因为在花发育的早期阶段细胞分裂快。然而，SS花有较长的花丝比LS花，主要是因为更大的细胞伸长。这些结果表明，胡枝子花的发育不同于以往研究中的具有花管的二端类群。此外，我们的结论是，存在的distyly在物种与开放的花朵是收敛进化的结果。
Distyly, a special polymorph, has evolved in many groups of angiosperms and has attracted attention since Darwin’s time. Development studies on distylous taxa have helped us to understand the evolutionary process of this polymorph, but most of these studies focus on species with narrowly tubular corolla. Here, we studied the floral development of Polygonum jucundum, a distylous species with broadly open flowers, at multiple spatial scales. Results showed that the difference in stigma height between flowers of the two morphs was caused by differences in style growth throughout the entire floral development process. The observed difference in anther heights between the two morphs was because the filaments grew faster in short-styled (SS) than in long-styled (LS) flowers in the later stages of floral development. In addition, the longer styles in LS flowers than in SS flowers was because of faster cell division in the early stages of floral development. However, SS flowers had longer filaments than LS flowers primarily because of greater cell elongation. These results indicate that floral development in P. jucundum differs from that of distylous taxa with floral tubes shown in previous studies. Further, we conclude that the presence of distyly in species with open flowers is a result of convergent evolution.
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影响因子：
2.9
作者：
CHARLESWORTH, D;CHARLESWORTH, B
通讯作者：
CHARLESWORTH, B
影响因子：
1.9
作者：
Chen, Ming Lin
通讯作者：
Chen, Ming Lin
影响因子：
3
作者：
RICHARDS, JH;BARRETT, SCH
通讯作者：
BARRETT, SCH
影响因子：
3
作者：
RICHARDS, JH;BARRETT, SCH
通讯作者：
BARRETT, SCH
影响因子：
1.9
作者：
RIVEROS, GM;BARRIA, OR;HUMANA, PAM
通讯作者：
HUMANA, PAM