Unité de Recherche d'Ecologie Végétale, Faculté des Sciences de Tunis, Université de Tunis El Manar, Campus Universitaire Farhat Hached, Tunis, Tunisia.
UMR INRAE 1355, CNRS 7254, Université Côte d'Azur, Institut Sophia Agrobiotech, Sophia Antipolis, France.
Planta. 2020 Jul 16;252(2):22. doi: 10.1007/s00425-020-03422-1.
In Medicago sativa nodulated roots, NR-dependent NO production is involved in maintaining energy state, presumably through phytoglobin NO respiration, under both salinity and hypoxia stress. The response to low and average salinity stress and to a 5 day-long flooding period was analyzed in M. sativa nodulated roots. The two treatments result in a decrease in the biological nitrogen fixation capacity and the energy state (evaluated by the ATP/ADP ratio), and conversely in an increase nitric oxide (NO) production. Under salinity and hypoxia treatments, the use of either sodium tungstate, an inhibitor of nitrate reductase (NR), or carboxy-PTIO, a NO scavenger, results in a decrease in NO production and ATP/ADP ratio, meaning that NR-dependent NO production participates to the maintenance of the nodulated roots energy state.
在紫花苜蓿根瘤中，NR 依赖性的 NO 产生参与在盐胁迫和缺氧胁迫下维持能量状态，可能是通过植物血球素的 NO 呼吸作用。在紫花苜蓿根瘤中分析了对低盐和中等盐胁迫以及 5 天的水淹处理的响应。这两种处理导致生物固氮能力和能量状态（通过 ATP/ADP 比评估）降低，而一氧化氮（NO）的产生增加。在盐和缺氧处理下，使用钨酸钠（硝酸还原酶（NR）的抑制剂）或羧基-PTIO（NO 清除剂）会导致 NO 产生和 ATP/ADP 比降低，这意味着 NR 依赖性的 NO 产生参与维持根瘤的能量状态。
