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Salicylic acid confers resistance against broomrape in tomato through modulation of C and N metabolism.
Plant Physiology and Biochemistry ( IF 6.1 ) Pub Date : 2019-12-24 , DOI: 10.1016/j.plaphy.2019.12.028 Mahmoud M Y Madany 1 , Wael A Obaid 2 , Wael Hozien 3 , Hamada AbdElgawad 4 , Badreldin A Hamed 5 , Ahmed M Saleh 6
Plant Physiology and Biochemistry ( IF 6.1 ) Pub Date : 2019-12-24 , DOI: 10.1016/j.plaphy.2019.12.028 Mahmoud M Y Madany 1 , Wael A Obaid 2 , Wael Hozien 3 , Hamada AbdElgawad 4 , Badreldin A Hamed 5 , Ahmed M Saleh 6
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It is well known that parasitic weeds such as Orobanche (broomrape) significantly decrease crop growth and yield. Although hormonal priming is a well-known inducer of plant resistance against broomrapes (Orobanche spp.), the metabolic events associated with such resistance are poorly understood. Therefore, the current work was undertaken to elucidate the role of SA in inducing tomato resistance against Orobanche, considering its impact on carbon and nitrogen metabolism of the host. Total carbon and nitrogen and levels of carbon (sugars, organic acids and fatty acids) and nitrogen (amino acids and polyamines)-containing metabolites as well as the activities of some key enzymes involved in their metabolic pathways were evaluated. Broomrape infection significantly disrupted C/N ratio in the host roots. On contrary, SA treatment markedly induced accumulation of sugars, organic acids, fatty acids, amino acids as well as polyamines in healthy plants. Under broomrape challenge, SA mitigated the infection-induced growth inhibition by improving the level of nitrogen-containing osmoprotectants (proline, arginine and some polyamines). However, a decrease was observed in some C and N assimilates which are well known to be potentially transferred to the parasite, such as sucrose, asparagine, alanine, serine and glutamate. Interestingly, SA treatment induced the catapolism of polyamines and fatty acids in the host root. Accordingly, our study suggests that SA-induced resistance against broomrape relies on the rational utilization of C and N assimilates in a manner that disturbs the sink strength of the parasite and/or activates the defense pool of the host.
中文翻译：
水杨酸通过调节C和N代谢赋予番茄抗扫帚的能力。
众所周知，寄生杂草（如Orobanche（扫帚））会大大降低作物的生长和单产。尽管激素引发是植物对扫帚的抗性的众所周知的诱导物（Orobanche spp。），但是与这种抗性相关的代谢事件知之甚少。因此，考虑到SA对寄主碳和氮代谢的影响，目前正在进行的工作旨在阐明SA在诱导番茄对Orobanche的抗性中的作用。评估了总碳和氮以及碳（糖，有机酸和脂肪酸）和氮（氨基酸和多胺）的代谢物的含量，以及参与其代谢途径的一些关键酶的活性。扫帚感染严重破坏了寄主根中的C / N比。恰恰相反，SA处理显着诱导了健康植物中糖，有机酸，脂肪酸，氨基酸以及多胺的积累。在扫帚的挑战下，SA通过提高含氮渗透保护剂（脯氨酸，精氨酸和某些多胺）的含量来减轻感染引起的生长抑制。然而，在某些已知可能转移至寄生虫的C和N同化物中观察到减少，例如蔗糖，天冬酰胺，丙氨酸，丝氨酸和谷氨酸。有趣的是，SA处理在宿主根部诱导了多胺和脂肪酸的分解。因此，我们的研究表明，SA诱导的对扫帚的抗性依赖于C和N同化物的合理利用，其方式会干扰寄生虫的汇合强度和/或激活宿主的防御库。
更新日期：2019-12-25
中文翻译：
水杨酸通过调节C和N代谢赋予番茄抗扫帚的能力。
众所周知，寄生杂草（如Orobanche（扫帚））会大大降低作物的生长和单产。尽管激素引发是植物对扫帚的抗性的众所周知的诱导物（Orobanche spp。），但是与这种抗性相关的代谢事件知之甚少。因此，考虑到SA对寄主碳和氮代谢的影响，目前正在进行的工作旨在阐明SA在诱导番茄对Orobanche的抗性中的作用。评估了总碳和氮以及碳（糖，有机酸和脂肪酸）和氮（氨基酸和多胺）的代谢物的含量，以及参与其代谢途径的一些关键酶的活性。扫帚感染严重破坏了寄主根中的C / N比。恰恰相反，SA处理显着诱导了健康植物中糖，有机酸，脂肪酸，氨基酸以及多胺的积累。在扫帚的挑战下，SA通过提高含氮渗透保护剂（脯氨酸，精氨酸和某些多胺）的含量来减轻感染引起的生长抑制。然而，在某些已知可能转移至寄生虫的C和N同化物中观察到减少，例如蔗糖，天冬酰胺，丙氨酸，丝氨酸和谷氨酸。有趣的是，SA处理在宿主根部诱导了多胺和脂肪酸的分解。因此，我们的研究表明，SA诱导的对扫帚的抗性依赖于C和N同化物的合理利用，其方式会干扰寄生虫的汇合强度和/或激活宿主的防御库。
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