Department of Soil Microbiology and Symbiotic Systems, Estación Experimental del Zaidín (CSIC), Professor Albareda 1, 18008 Granada, Spain.
J Plant Physiol. 2011 Feb 15;168(3):294-7. doi: 10.1016/j.jplph.2010.08.011.
Strigolactones are a new class of plant hormones emerging as important signals in the control of plant architecture. In addition, they are key elements in plant communication with several rhizosphere organisms. Strigolactones are exuded into the soil, where they act as host detection signals for arbuscular mycorrhizal (AM) fungi, but also as germination stimulants for root parasitic plant seeds. Under phosphate limiting conditions, plants up-regulate the secretion of strigolactones into the rhizosphere to promote the formation of AM symbiosis. Using tomato as a model plant, we have recently shown that AM symbiosis induces changes in transcriptional and hormonal profiles. Using the same model system, here we analytically demonstrate, using liquid chromatography-tandem mass spectrometry, that strigolactone production is also significantly reduced upon AM symbiosis. Considering the dual role of the strigolactones in the rhizosphere as signals for AM fungi and parasitic plants, we discuss the potential implications of these changes in the plant interaction with both organisms.
独脚金内酯是一类新的植物激素，作为控制植物结构的重要信号而出现。此外，它们还是植物与几种根际生物进行交流的关键要素。独脚金内酯被分泌到土壤中，在土壤中它们作为丛枝菌根（AM）真菌的宿主检测信号，但也作为根寄生植物种子的萌发刺激物。在磷酸盐限制条件下，植物上调独脚金内酯分泌到根际，以促进 AM 共生的形成。我们最近使用番茄作为模式植物，表明 AM 共生诱导转录和激素特征的变化。使用相同的模型系统，我们在这里通过液相色谱-串联质谱分析证明，在 AM 共生时，独脚金内酯的产生也显著减少。考虑到独脚金内酯在根际中作为 AM 真菌和寄生植物信号的双重作用，我们讨论了这些变化对植物与这两种生物相互作用的潜在影响。
