Ivanov Yury V, Ivanova Alexandra I, Kartashov Alexander V, Kuznetsov Vladimir V
K.A. Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya Street 35, 127276 Moscow, Russia.
Plants (Basel). 2024 Aug 11;13(16):2227. doi: 10.3390/plants13162227.
We studied the recovery of the growth and physiological parameters of Scots pine seedlings after long-term zinc toxicity. The removal of excess zinc from the nutrient solution resulted in the rapid recovery of primary root growth but did not promote the initiation and growth of lateral roots. The recovery of root growth was accompanied by the rapid uptake of manganese, magnesium, and copper. Despite the maximum rate of manganese uptake by the roots, the manganese content in the needles of the recovering plants did not reach control values during the 28 days of the experiment, unlike magnesium, iron, and copper. In general, the recovery of ion homeostasis eliminated all of the negative effects on the photosynthetic pigment content in the needles. However, these changes, along with recovery of the water content in the needles, were not accompanied by an increase in the weight gain of the recovering seedlings compared with that of the Zn-stressed seedlings. The increased accumulation of phenolic compounds in the needles persisted for a long period after excess zinc was removed from the nutrient solution. The decreased lignin content in the roots and needles is a characteristic feature of Zn-stressed plants. Moreover, the removal of excess zinc from the nutrient solution did not lead to an increase in the lignin content in the organs.
我们研究了长期锌毒性作用后欧洲赤松幼苗生长和生理参数的恢复情况。从营养液中去除过量锌导致主根生长迅速恢复，但并未促进侧根的起始和生长。根生长的恢复伴随着锰、镁和铜的快速吸收。尽管根部对锰的吸收速率达到最大值，但与镁、铁和铜不同，在实验的28天内，恢复生长的植株针叶中的锰含量未达到对照值。总体而言，离子稳态的恢复消除了对针叶光合色素含量的所有负面影响。然而，这些变化以及针叶中水分含量的恢复，并未伴随恢复生长的幼苗与锌胁迫幼苗相比重量增加。从营养液中去除过量锌后，针叶中酚类化合物的积累增加持续了很长一段时间。根和针叶中木质素含量降低是锌胁迫植物的一个特征。此外，从营养液中去除过量锌并未导致器官中木质素含量增加。
