Differential growth at the apical hook: all roads lead to auxin.
Differential growth at the apical hook: all roads lead to auxin.
复制标题
DOI：
10.3389/fpls.2013.00441
复制
发表时间：
2013-11-05
影响因子：
5.6
通讯作者：
Blázquez MA
中科院分区：
文献类型：
--
作者：
Abbas M;Alabadí D;Blázquez MA
顶钩是双子叶植物种子埋于土壤中萌发时出现的一种受发育调控的结构。它是由下胚轴上部两侧的细胞差异性膨胀形成的，在幼苗向上生长寻求光照时，保护茎尖分生组织和子叶免受损伤。它明显的简单性和事实上，它是在试管中生长的幼苗时，已经转换的顶钩在一个最喜欢的实验模型，以研究差异生长的调节。在早期的研究中已经证明了激素-特别是生长素-在这个过程中的参与。值得注意的是，这种激素在钩状弯曲处的梯度有助于完成其发育，类似于已经提出的涉及器官弯曲的其他过程，如向性反应。与此一致，其他植物主要是赤霉素和乙烯和光，调节生长素梯度，以及时和相互关联的方式，以促进钩的发展和开放，分别。在这里，我们回顾了最新的研究结果，主要是与拟南芥的顶端钩，特别注意的分子机制之间的交叉调节不同的激素信号通路的基础，这一发展过程。
The apical hook is a developmentally regulated structure that appears in dicotyledonous seedlings when seeds germinate buried in the soil. It protects the shoot apical meristem and cotyledons from damage while the seedling is pushing upwards seeking for light, and it is formed by differential cell expansion between both sides of the upper part of the hypocotyl. Its apparent simplicity and the fact that it is dispensable when seedlings are grown in vitro have converted the apical hook in one of the favorite experimental models to study the regulation of differential growth. The involvement of hormones –especially auxin—in this process was manifested already in the early studies. Remarkably, a gradient of this hormone across the hook curvature is instrumental to complete its development, similar to what has been proposed for other processes involving the bending of an organ, such as tropic responses. In agreement with this, other hormones—mainly gibberellins and ethylene—and the light, regulate in a timely and interconnected manner the auxin gradient to promote hook development and its opening, respectively. Here, we review the latest findings obtained mainly with the apical hook of Arabidopsis thaliana, paying special attention to the molecular mechanisms for the cross-regulation between the different hormone signaling pathways that underlie this developmental process.
登录
查看更多内容
DOI：
10.1073/pnas.1011066108
发表时间：
2011-01-25
影响因子：
11.1
作者：
Kim, Keunhwa;Shin, Jieun;Choi, Giltsu
通讯作者：
Choi, Giltsu
影响因子：
56.9
作者：
BLEECKER, AB;ESTELLE, MA;KENDE, H
通讯作者：
KENDE, H
影响因子：
7.4
作者：
LISCUM, E;HANGARTER, RP
通讯作者：
HANGARTER, RP
DOI：
10.1073/pnas.0507127103
发表时间：
2006-01-03
影响因子：
11.1
作者：
Esmon, CA;Tinsley, AG;Liscum, E
通讯作者：
Liscum, E
影响因子：
11.6
作者：
Khanna, Rajnish;Shen, Yu;Quail, Peter H.
通讯作者：
Quail, Peter H.