The research aims were to study salicylic acid (SA) effects on mycorrhiza [hyphal width (HW), vesicle diameter (VD) and mycorrhizal colonization (MC)] and interaction between them on greenness index (GI), drought tolerance index (DTI), antioxidant enzymes activities, and seed yield of linseed under drought. A factorial experiment was conducted in an open-field place with mycorrhiza [non-inoculation, Funneliformis mosseae (FM), and Rhizoglomus intraradices (RI)], SA (250 μM and non-SA), and irrigation levels [100%, 70%, and 40% field capacity (FC)] as treatments. Severe drought increased VD, MC, superoxide dismutase (SOD), ascorbate peroxidase (APX), and peroxidase activities while decreased GI, DTI, and yield. The RI-linseed had higher MC, GI, SOD, and glutathione reductase (GR) activities, but FM-linseed had greater VD and yield under drought. Inoculated linseed with both mycorrhiza showed a reduction in DTI and yield under SA than non-SA. In RI-linseed, SA increased GI, MC, HW, VD, catalase and GR, but decreased in FM-plants. Mycorrhiza (particularly RI) alleviated drought (40% FC)-caused negative effects on linseed via the improvement of SOD, APX, and GI. Regardless of other treatments, SA had negative effects on HW and VD, but SA effects varied depending on mycorrhizal species so that SA increased HW, VD, and MC in RI. Due to the positive correlation between MC and HW, SA reduces FM colonization by reducing the HW of FM. Totally, SA along with RI species can mitigate the harmful effects of drought and improve tolerance via increasing MC, HW, VD, catalase, peroxidase, and GR activities.

研究目的是研究水杨酸 (SA) 对菌根 [菌丝宽度 (HW)、囊泡直径 (VD) 和菌根定植 (MC)] 的影响以及它们之间对绿色指数 (GI)、耐旱指数 (DTI) 的相互作用、抗氧化酶活性和干旱条件下亚麻籽的产量。在开阔场地用菌根 [非接种、Funneliformis mosseae (FM) 和Rhizoglomus intraradices(RI)]、SA（250 μM 和非 SA）和灌溉水平 [100%、70% 和 40% 田间持水量 (FC)] 作为处理。严重干旱增加了 VD、MC、超氧化物歧化酶 (SOD)、抗坏血酸过氧化物酶 (APX) 和过氧化物酶的活性，同时降低了 GI、DTI 和产量。RI-亚麻籽具有较高的MC、GI、SOD和谷胱甘肽还原酶（GR）活性，而FM-亚麻籽在干旱条件下具有较高的VD和产量。接种两种菌根的亚麻籽在 SA 下的 DTI 和产量均低于非 SA。在 RI-亚麻籽中，SA 增加 GI、MC、HW、VD、过氧化氢酶和 GR，但在 FM-植物中降低。菌根（特别是 RI）通过改善 SOD、APX 和 GI 减轻了干旱（40% FC）对亚麻籽的负面影响。无论其他治疗如何，SA 对 HW 和 VD 都有负面影响，但 SA 效应因菌根种类而异，因此 SA 增加了 RI 中的 HW、VD 和 MC。由于 MC 与 HW 呈正相关，SA 通过降低 FM 的 HW 来减少 FM 的定植。总的来说，SA 和 RI 物种可以通过增加 MC、HW、VD、过氧化氢酶、过氧化物酶和 GR 活性来减轻干旱的有害影响并提高耐受性。