Nagata Maki, Hashimoto Masahito, Murakami Ei-ichi, Shimoda Yoshikazu, Shimoda-Sasakura Fuyuko, Kucho Ken-ichi, Suzuki Akihiro, Abe Mikiko, Higashi Shiro, Uchiumi Toshiki
Graduate School of Science and Technology, Kagoshima University, Kagoshima, Japan.
Plant Signal Behav. 2009 Mar;4(3):202-4. doi: 10.4161/psb.4.3.7796.
Leguminous plants form root nodules, in which symbiotic rhizobia fix atmospheric nitrogen and supply the fixation products to their host plants as a nitrogen source. On the process of establishing the symbiosis, rhizobia induce genes involved in the defense system of their host plants. However, the host defense responses will be cancelled by unknown mechanism. We focused on nitric oxide (NO) as a key molecule of plant defense system and class 1 plant hemoglobin (Hb) as a scavenger of NO. The inoculation of a symbiotic rhizobium, MAFF303099, induced transiently NO production and expression of a class 1 Hb gene in the roots of a model legume . In this addendum, we show that the lipopolysaccharide of induces NO production and expression of in , and we propose the role of NO and Hb at the early stage of symbiosis.
豆科植物形成根瘤，共生根瘤菌在其中固定大气中的氮，并将固定产物作为氮源提供给宿主植物。在建立共生关系的过程中，根瘤菌诱导宿主植物防御系统中的相关基因。然而，宿主的防御反应会通过未知机制被消除。我们将一氧化氮（NO）作为植物防御系统的关键分子，将1类植物血红蛋白（Hb）作为NO的清除剂进行了研究。接种共生根瘤菌MAFF303099可在模式豆科植物的根中瞬时诱导NO的产生和1类Hb基因的表达。在本附录中，我们表明[根瘤菌的]脂多糖可诱导[模式豆科植物]中NO的产生和[1类Hb基因的]表达，并提出了NO和Hb在共生早期的作用。
