Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, 1055 du PEPS, PO Box 10380, Stn Sainte-Foy, Québec, QC, G1V 4C7, Canada.
New Phytol. 2011 Feb;189(3):678-687. doi: 10.1111/j.1469-8137.2010.03544.x. Epub 2010 Nov 18.
The perennial plant model species Populus trichocarpa has received considerable attention in the last 5 yr because of its potential use as a bioenergy crop. The completion of its genome sequence revealed extensive homologies with the herbaceous annual species Arabidopsis thaliana. This review highlights the similarities and differences at the qualitative defence response components level, notably in putative NBS-LRR protein content and downstream defence regulators. With almost a twofold NBS-LRR gene complement compared with A. thaliana, P. trichocarpa also encodes some putative R-proteins with unusual architectures and possible DNA-binding capacity. P. trichocarpa also possesses all the known main components characteristic of TIR-NB-LRR and CC-NB-LRR signalling. However, very little has been done with regard to the components involved in the poplar qualitative response to pathogens. In addition, the relationship between plant-biotroph perception/signalling and the role of salicylic acid, an important defence compound, remains uncertain. This review aims to identify the genomic components present in poplar that could potentially participate in the qualitative response and highlights where efforts should be devoted to obtain a better understanding of the poplar qualitative defence response.
多年生植物模式物种杨树（Populus trichocarpa）因其可能被用作生物能源作物而在过去 5 年中受到了相当多的关注。其基因组序列的完成揭示了它与草本一年生植物拟南芥（Arabidopsis thaliana）之间广泛的同源性。本综述重点介绍了定性防御反应成分水平上的相似性和差异，特别是在假定的 NBS-LRR 蛋白含量和下游防御调节剂方面。与拟南芥相比，杨树的 NBS-LRR 基因组成几乎多了一倍，还编码了一些具有不寻常结构和可能具有 DNA 结合能力的假定 R 蛋白。杨树还具有 TIR-NB-LRR 和 CC-NB-LRR 信号的所有已知主要成分特征。然而，对于杨树对病原体的定性反应所涉及的成分，几乎没有做什么工作。此外，植物-生物寄生感知/信号转导与水杨酸（一种重要的防御化合物）的作用之间的关系仍然不确定。本综述旨在确定杨树中可能参与定性反应的基因组成分，并强调应该努力理解杨树的定性防御反应。
