Šípošová Kristína, Labancová Eva, Kučerová Danica, Kollárová Karin, Vivodová Zuzana
Institute of Botany, Plant Science and Biodiversity Centre, Slovak Academy of Sciences, Dúbravská cesta 9, 845 23 Bratislava, Slovakia.
Institute of Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38 Bratislava, Slovakia.
Plants (Basel). 2021 Nov 18;10(11):2503. doi: 10.3390/plants10112503.
Auxins are plant hormones that affect plant growth, development, and improve a plant's tolerance to stress. In this study, we found that the application of indole-3-butyric acid (IBA) had diverse effects on the growth of maize ( L.) roots treated without/with Cd. IBA caused changes in the growth and morphology of the roots under non-stress conditions; hence, we were able to select two concentrations of IBA (10 M as stimulatory and 10 M as inhibitory). IBA in stimulatory concentration did not affect the concentration of HO or the activity of antioxidant enzymes while IBA in inhibitory concentration increased only the concentration of HO (40.6%). The application of IBA also affected the concentrations of mineral nutrients. IBA in stimulatory concentration increased the concentration of N, K, Ca, S, and Zn (5.8-14.8%) and in inhibitory concentration decreased concentration of P, K, Ca, S, Fe, Mn, Zn, and Cu (5.5-36.6%). Moreover, IBA in the concentration 10 M had the most positive effects on the plants cultivated with Cd. It decreased the concentration of HO (34.3%), the activity of antioxidant enzymes (23.7-36.4%), and increased the concentration of all followed elements, except Mg (5.5-34.1%), when compared to the Cd.
生长素是一类植物激素，可影响植物的生长、发育，并提高植物对胁迫的耐受性。在本研究中，我们发现吲哚 - 3 - 丁酸（IBA）的施用对经镉处理/未经镉处理的玉米根生长具有不同影响。在非胁迫条件下，IBA导致根的生长和形态发生变化；因此，我们能够选择两种IBA浓度（10 μM为促进浓度，100 μM为抑制浓度）。促进浓度的IBA不影响过氧化氢（HO）浓度或抗氧化酶活性，而抑制浓度的IBA仅使HO浓度增加（40.6%）。IBA的施用还影响矿质营养元素的浓度。促进浓度的IBA使氮、钾、钙、硫和锌的浓度增加（5.8 - 14.8%），而抑制浓度的IBA使磷、钾、钙、硫、铁、锰、锌和铜的浓度降低（5.5 - 36.6%）。此外，10 μM浓度的IBA对镉处理的植株具有最积极的影响。与镉处理相比，它使HO浓度降低（34.3%），抗氧化酶活性降低（23.7 - 36.4%），并使除镁之外的所有后续元素浓度增加（5.5 - 34.1%）。
