Billard Vincent, Maillard Anne, Coquet Laurent, Jouenne Thierry, Cruz Florence, Garcia-Mina José-Maria, Yvin Jean-Claude, Ourry Alain, Etienne Philippe
Normandie Université, Caen, France; UNICAEN, UMR 950 Ecophysiologie Végétale, Agronomie et Nutritions N, C, S, Esplanade de la Paix, CS14032, 14032, Caen Cedex 5, France; INRA, UMR 950 Ecophysiologie Végétale, Agronomie et Nutritions N, C, S, Esplanade de la Paix, CS14032, 14032, Caen Cedex 5, France.
Plateforme de Protéomique PISSARO, UMR6270 CNRS Faculté des Sciences de Rouen, 76821, Mont-Saint-Aignan, France.
Plant Physiol Biochem. 2016 Oct;107:337-343. doi: 10.1016/j.plaphy.2016.06.025. Epub 2016 Jun 18.
In order to cope with variable mineral nutrient availability, higher plants have developed numerous strategies including the remobilization of nutrients from source to sink tissues. However, such processes remain relatively unknown for magnesium (Mg), which is the third most important cation in plant tissues. Using Mg depletion of Brassica napus, we have demonstrated that Mg is remobilized from old leaves to young shoot tissues. Moreover, this study showed that Mg depletion induces modification of nutrient uptake, especially Zn and Mn. Finally, comparative proteomic analysis of old leaves (source of Mg) revealed amongst other results that some proteins requiring Mg for their functionality (isocitrate dehydrogenase for example) were up-regulated. Moreover, down-regulation of proteases suggested that mobilization of Mg from old leaves was not associated with senescence.
为了应对可变的矿质养分有效性，高等植物已发展出多种策略，包括将养分从源组织转运到库组织。然而，对于植物组织中第三重要的阳离子镁（Mg）而言，此类过程仍相对未知。利用甘蓝型油菜的镁亏缺，我们已证明镁从老叶转运至幼嫩茎组织。此外，该研究表明镁亏缺会诱导养分吸收的改变，尤其是锌和锰。最后，对老叶（镁源）的比较蛋白质组学分析揭示，除其他结果外，一些功能上需要镁的蛋白质（例如异柠檬酸脱氢酶）被上调。此外，蛋白酶的下调表明从老叶中转运镁与衰老无关。
