Comparison of Effects of Potassium Iodide and Iodosalicylates on the Antioxidant Potential and Iodine Accumulation in Young Tomato Plants
Mariya Halka , Sylwester Smoleń , Iwona Ledwożyw-Smoleń , Włodzimierz Sady
AbstractIodine (I) is classifed as a benefcial element for plants. Until now, there have been only hypotheses regarding the uptakes of organic iodine compounds by plant roots. The purpose of our research was to compare the uptakes and efects of the application of the following mineral and organic iodine compounds on young tomato plants: KI, 5-iodosalicylic (5-ISA), and 3,5-diiodosalicylic (3,5-diISA) acids. An additional control combination included the treatment with salicylic acid (SA) alone. All compounds were introduced into the nutrient solution in 5, 10, 25, and 50 μM I concentrations. It was established that after the application of 5-ISA and 3,5-diISA, iodine is taken up to a smaller extent than from KI. The tested KI, 3,5-diISA, and 5-ISA doses had no negative impact on the growth and development of plants, apart from the reduction of shoot biomass after the application of 3,5-diISA in 10 and 25 µM I doses. All applied compounds, except for SA, caused a reduction of ascorbic acid (AA) content and increase of dehydroascorbic acid (DHA) content in leaves. A signifcant increase of APX activity was noted only for the highest doses of KI and 5-ISA. None of the iodine compounds, in most tested doses, have substantially increased the CAT and POX activities in tomato leaves. Application of KI decreased the levels of all analyzed sugars in tomato leaves. The efect of iodosalicylates on sugar content varied depending on the compound: when applied in the highest dose 5-ISA increased, while 3,5-diISA decreased the sugar accumulation in tomato plants. In all tested treatments, a reduction of SA content in leaves was noted. We conclude that organic iodine compounds, i.e., 3,5-diISA and 5-ISA, can be taken up by the roots of tomato plants at an early stage of development.
|Journal series||Journal of Plant Growth Regulation, ISSN 0721-7595, e-ISSN 1435-8107, (N/A 70 pkt)|
|Publication size in sheets||0.65|
|Keywords in English||Iodine biofortifcation, Organic and mineral iodine, Iodosalicylates, Oxidative stress|
|License||Journal (articles only); author's original; ; after publication|
|Publication indicators||= 0; : 2018 = 1.043; : 2018 = 2.179 (2) - 2018=2.893 (5)|
|Finansowanie||This work was supported by the Ministry of Science and Higher Education of the Republic of Poland. The organic form of iodine applied into plants was taken from our patented solution: Sady, W., Smoleń S., Ledwożyw-Smoleń, I. Methods of biofortifcation of vegetables with iodine. Patent No. P.410806, Polish Patent Ofce 20.11.2017.|
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