Molecular features of secondary vascular tissue regeneration after bark girdling in Populus.-猫眼课题宝

杨树树皮环剥后次生维管组织再生的分子特征。

DOI：

10.1111/j.1469-8137.2011.03855.x

发表时间：

2011-12

期刊：

The New phytologist

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

再生是植物在受到其他生物体攻击或物理攻击后修复组织损伤的常见策略。然而，分化细胞如何获得再生能力并重建新组织的模式仍然很大程度上未知。通过解剖观察和微阵列分析，我们研究了树木环剥后次生维管组织再生的形态过程和分子特征。树皮环剥后，新的韧皮部和形成层从分化的木质部细胞中再生出来，并在1个月内重建次生维管组织模式。分化的木质部细胞通过表观遗传调控和细胞周期重新进入获得再生能力。木质部发育程序被阻断，而韧皮部或形成层程序被激活，导致次生维管组织模式重建。植物激素在血管组织再生中发挥重要作用。我们提出了一个模型，描述树皮环剥后次生维管组织再生的分子特征。它为了解植物次生维管组织的组织再生和模式形成机制提供了信息。

Regeneration is a common strategy for plants to repair damage to their tissue after attacks from other organisms or physical assaults. However, how differentiating cells acquire regenerative competence and rebuild the pattern of new tissues remains largely unknown. Using anatomical observation and microarray analysis, we investigated the morphological process and molecular features of secondary vascular tissue regeneration after bark girdling in trees. After bark girdling, new phloem and cambium regenerate from differentiating xylem cells and rebuild secondary vascular tissue pattern within 1 month. Differentiating xylem cells acquire regenerative competence through epigenetic regulation and cell cycle re-entry. The xylem developmental program was blocked, whereas the phloem or cambium program was activated, resulting in the secondary vascular tissue pattern re-establishment. Phytohormones play important roles in vascular tissue regeneration. We propose a model describing the molecular features of secondary vascular tissue regeneration after bark girdling in trees. It provides information for understanding mechanisms of tissue regeneration and pattern formation of the secondary vascular tissues in plants.