Fusarium head blight (FHB) is one of the most devastating fungal diseases affecting grain crops and Fusarium graminearum is the most aggressive causal species. Several evidences shown that stomatal closure is involved in the first line of defence against plant pathogens. However, there is very little evidence to show that photosynthetic parameters change in inoculated plants. The aim of the present study was to study the role of stomatal regulation in wheat after F. graminearum inoculation and explore its possible involvement in FHB resistance. RT-qPCR revealed that genes involved in stomatal regulation are induced in the resistant Sumai3 cultivar but not in the susceptible Rebelde cultivar. Seven genes involved in the positive regulation of stomatal closure were up-regulated in Sumai3, but it is most likely, that two genes, TaBG and TaCYP450, involved in the negative regulation of stomatal closure, were strongly induced, suggesting that FHB response is linked to cross-talk between the genes promoting and inhibiting stomatal closure. Increasing temperature of spikes in the wheat genotypes and a decrease in photosynthetic efficiency in Rebelde but not in Sumai3, were observed, confirming the hypothesis that photosynthetic parameters are related to FHB resistance.

赤霉病 (FHB) 是影响粮食作物的最具破坏性的真菌病害之一，而禾谷镰刀菌是最具侵袭性的致病菌种。一些证据表明，气孔关闭涉及植物病原体的第一道防线。然而，几乎没有证据表明接种植物的光合参数发生变化。本研究的目的是研究F后小麦气孔调节的作用。接种禾谷镰刀菌并探讨其可能参与 FHB 耐药性。 RT- q PCR 显示，参与气孔调节的基因在抗性 Sumai3 品种中被诱导，但在易感 Rebelde 品种中则不然。 Sumai3 中参与气孔关闭正向调节的 7 个基因上调，但最有可能的是，涉及气孔关闭负向调节的两个基因TaBG和TaCYP450被强烈诱导，表明 FHB 反应是相关的促进和抑制气孔关闭的基因之间的串扰。在 Rebelde 中观察到小麦基因型穗部温度升高，并且光合效率降低，但在 Sumai3 中未观察到，这证实了光合参数与 FHB 抗性相关的假设。