The dragon’s head (Lallemantia iberica L.) and lady's mantle (L. royleana L.) are potential sources of plant oil, mucilage, and omega-3 fatty acid. An effective plant-arbuscular mycorrhizal fungi (AMF) symbiosis can improve plant growth and development, especially under drought stress. This study aimed to evaluate the effects of AMF inoculation on the growth, yield, fatty acid compositions, and physiological processes of L. iberica and L. royleana under various irrigation intervals (i.e., irrigation after 30 % (I30), 60 % (I60), and 90 % (I90) of soil available water depletion). The results showed improved growth parameters, seed yield, chlorophyll concentration, stomatal movement, antioxidant enzyme activities, and radical scavenging activity in AMF-inoculated plants in both species compared to control plants (without AMF inoculation). Moreover, the seed of AMF-inoculated plants had higher phosphor uptake, mucilage, and oil content. Interestingly, AMF application modified the profile of seed fatty acids such as eicosenoic, arachidic, linolenic, and linoleic acids. Although water deficit drastically affected control plants, AMF-inoculated plants under I60 treatment showed relatively more incredible performance in both species. On the other hand, inoculated plants showed higher antioxidant activity and less reactive oxygen species accumulation than control plants. The results suggested that irrigation after 60 % of soil available water depletion coupled with AMF inoculation can lead to optimized production of L. iberica and L. royleana in semi-arid environments.

龙头 ( Lallemantia iberica L.) 和女士披风 ( L. royleana L.) 是植物油、粘液和 omega-3 脂肪酸的潜在来源。有效的植物丛枝菌根真菌 (AMF) 共生可以改善植物的生长发育，尤其是在干旱胁迫下。本研究旨在评估接种 AMF 对L. iberica和L. royleana的生长、产量、脂肪酸组成和生理过程的影响在不同的灌溉间隔下（即，在土壤可用水耗竭的 30% (I30)、60% (I60) 和 90% (I90) 后进行灌溉）。结果表明，与对照植物（未接种 AMF）相比，两个物种中接种 AMF 的植物的生长参数、种子产量、叶绿素浓度、气孔运动、抗氧化酶活性和自由基清除活性都有所改善。此外，接种 AMF 的植物种子具有更高的磷吸收、粘液和含油量。有趣的是，AMF 应用改变了种子脂肪酸的分布，例如二十碳烯酸、花生酸、亚麻酸和亚油酸。尽管缺水严重影响了对照植物，但在 I60 处理下接种 AMF 的植物在两个物种中都表现出相对更令人难以置信的表现。另一方面，与对照植物相比，接种的植物表现出更高的抗氧化活性和更少的活性氧积累。结果表明，在土壤有效水消耗 60% 后进行灌溉，再加上接种 AMF 可以优化产量。L. iberica和L. royleana在半干旱环境中。