Organ identity and environmental conditions determine the effectiveness of nonhost resistance in the interaction between Arabidopsis thaliana and Magnaporthe oryzae
Organ identity and environmental conditions determine the effectiveness of nonhost resistance in the interaction between Arabidopsis thaliana and Magnaporthe oryzae
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DOI：
10.1111/j.1364-3703.2010.00682.x
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发表时间：
2011-05-01
影响因子：
4.9
通讯作者：
Schaffrath, Ulrich
中科院分区：
文献类型：
--
作者：
Schreiber, Christine;Slusarenko, Alan J.;Schaffrath, Ulrich
导致植物对非适应性病原体产生非寄主抗性的机制被认为对未来重要农业疾病的管理具有巨大的潜力。在这篇文章中，我们报告了一项研究非寄主抗性的优势，研究两种模式生物，即拟南芥和稻瘟病菌之间的相互作用。然而，在我们的研究过程中，我们发现拟南芥对这种表面上非宿主病原体的反应具有意想不到的可塑性。因此，我们阐明了某些实验条件，如植物在持续高湿的长时间生长和使用高接种浓度的M. oryzae分生孢子，迫使一些拟南芥生态型叶片的相互作用朝着增加相容性的方向发展。然而，从未观察到孢子形成。此外，我们观察到根普遍对M. oryzae敏感，而叶、茎和下胚轴不受感染。因此，必须得出结论，拟南芥的根缺乏对m.o ryzae的有效防御能力，而其叶片具有这种非寄主防御机制。总之，我们的研究结果指出了影响植物非寄主抗性有效性的器官特异性决定因素和环境条件。
P>Mechanisms leading to nonhost resistance of plants against nonadapted pathogens are thought to have great potential for the future management of agriculturally important diseases. In this article, we report an investigation of nonhost resistance motivated by the advantages of studying an interaction between two model organisms, namely Arabidopsis thaliana and Magnaporthe oryzae. During the course of our studies, however, we discovered an unexpected plasticity in the responses of Arabidopsis against this ostensibly nonhost pathogen. Thus, we elucidated that certain experimental conditions, such as the growth of plants under long days at constantly high humidity and the use of high inoculum concentrations of M. oryzae conidia, forced the interaction in leaves of some Arabidopsis ecotypes towards increased compatibility. However, sporulation was never observed. Furthermore, we observed that roots were generally susceptible to M. oryzae, whereas leaves, stems and hypocotyls were not infected. It must be concluded, therefore, that Arabidopsis roots lack an effective defence repertoire against M. oryzae, whereas its leaves possess such nonhost defence mechanisms. In summary, our findings point to organ-specific determinants and environmental conditions influencing the effectiveness of nonhost resistance in plants.