Laboratoire d'Ecophysiologie des Plantes sous Stress Environnementaux, INRA-AGRO-M, UMR 759, 2 Place Viala, 34060 Montpellier Cedex 1, France.
Ann Bot. 2011 Jul;108(1):159-68. doi: 10.1093/aob/mcr091. Epub 2011 May 17.
ERECTA has been identified as a pleiotropic regulator of developmental and physiological processes in Arabidopsis thaliana. Previous work demonstrated a role for ERECTA in the control of compensation between epidermal cell expansion and division in leaves.
In this work, spatial and temporal analyses of epidermal cell division and expansion were performed on successive developing vegetative leaves of Arabidopsis thaliana in both ERECTA and erecta lines, LER and Ler, respectively, to understand how the ERECTA gene regulates compensation between these two processes.
The loss of ERECTA function leads to a low cell expansion rate in all zones of a leaf and in all successive leaves of a plant. This low cell expansion rate is counterbalanced by an increase in the duration of cell division. As a consequence, the ERECTA mutation eliminates the tip to base cellular gradient generally observed in the leaf epidermis and also flattens the heteroblastic changes in epidermal cell area and number within a rosette. Ablation of floral buds eliminates the heteroblastic changes in cellular patterns in an ERECTA-dependent manner.
The results provide a detailed description of changes in leaf growth dynamics and cellular variables in both LER and Ler. Altogether they suggest that ERECTA influences leaf cellular development in relation to whole plant ontogeny.
Erecta 已被鉴定为拟南芥发育和生理过程中的多效调节因子。先前的工作表明，Erecta 在控制叶片表皮细胞扩张和分裂之间的补偿中起作用。
在这项工作中，对拟南芥连续发育的营养叶的表皮细胞分裂和扩张进行了时空分析，分别在 ERECTA 和 erecta 系 LER 和 Ler 中进行，以了解 ERECTA 基因如何调节这两个过程之间的补偿。
Erecta 功能的丧失导致叶片所有区域和植物所有连续叶片的细胞扩张率降低。细胞分裂持续时间的增加抵消了这一低细胞扩张率。因此，Erecta 突变消除了通常在叶片表皮中观察到的顶端到基部的细胞梯度，也使表皮细胞面积和数量在玫瑰结内的异态变化变平。花芽的切除以 Erecta 依赖的方式消除了细胞模式的异态变化。
这些结果提供了 LER 和 Ler 中叶片生长动态和细胞变量变化的详细描述。总的来说，它们表明 Erecta 影响与整个植物个体发生有关的叶片细胞发育。
