Induced resistance in maize is based on organ-specific defence responses
Induced resistance in maize is based on organ-specific defence responses
复制标题
DOI：
10.1111/tpj.12114
复制
发表时间：
2013-04-01
期刊：
影响因子：
7.2
通讯作者：
Mauch-Mani, Brigitte
中科院分区：
文献类型：
--
作者：
Balmer, Dirk;de Papajewski, Daniela Villacres;Mauch-Mani, Brigitte
为了进一步了解玉米(Zea Mays)与病原菌炭疽病菌(Colletotrichum Graminicola)之间复杂的相互作用，同时对玉米叶片和根的局部和系统分子和化学防御反应进行了研究和比较。在地上和地下器官中都发现了相似的基因表达和激素模式；然而，根的反应更快，积累了更高水平的防御相关激素。根和叶感染稻瘟病菌引发了叶片对同一真菌的系统抗性。这种系统性防御反应与系统性转录适应、水杨酸和脱落酸水平升高有关。代谢组学分析表明，叶和根中次生代谢物的组成存在显著差异，表明这些器官使用不同的化学防御系统。此外，较高的基础水平的抗菌黄酮类化合物表明，加强了基础防御状态的根。我们的发现揭示了玉米组织特有的局部和系统的抗真菌防御机制。
To obtain further insight into the intricate inter-play between maize (Zea mays) and the fungal pathogen Colletotrichum graminicola, the local and systemic molecular and chemical defence responses of maize leaves and roots were simultaneously investigated and compared. Similar gene expression and hormonal patterns were detected in both above- and below-ground organs; however, roots responded more rapidly and accumulated higher levels of defence-related hormones than leaves. Leaf and root infection with C. graminicola triggered systemic resistance in the foliage against the same fungus. This systemic defence response was associated with systemic transcriptional adaptations, and elevated levels of salicylic acid and abscisic acid. Metabolomic profiling revealed significant differences in the composition of secondary metabolites in leaves and roots, indicating that these organs employ distinct chemical defence systems. In addition, higher basal levels of antimicrobial flavonoids suggest an enhanced basal defensive state of roots. Our findings reveal tissue-specific local and systemic antifungal defence mechanisms in maize.