Akademik Veri Yönetim Sistemi
Plant Biosystems, cilt.159, sa.5, ss.1134-1148, 2025 (SCI-Expanded, Scopus)
There is limited knowledge regarding the reduction of boron(B)-induced stress/toxicity in Nicotiana tabacum caused by selenium (Se), particularly about the effects on root anatomy, photosynthetic functions, as well as antioxidative responses. This study aimed to evaluate the effect of Se on B toxicity and the related mechanisms. Various levels of boric acid were administered to the soil. Every B treatment consisted of two Se treatments, which included a control group and Se treatment. The findings of our study indicate that the presence of high B levels resulted in a reduction in the growth of roots, as well as in the areas of the cortical parenchyma (CP) and vascular cylinder (VC). This, in turn, affected the ratio of VC/CP, the dry weight of shoots, relative water content (RWC) of both leaves and roots and concentration of indole-3-acetic acid (IAA) in roots. Treatments also increased length of specific roots, shoot/root ratio, and levels of 1-aminocyclopropane-1-carboxylic acid (ACC) and abscisic acid (ABA) in roots. Se addition resulted in an increase in various plant growth parameters, including shoot/root ratio, relative water content (RWC), specific root length, VC and CP areas, total root area, and IAA/ACC and IAA/ABA ratios. Se enhanced structure of xylem, plant growth regulator IAA, and reduced ACC and ABA, which promote plant aging, hence promoting the growth in presence of B-induced stress. Se exhibited statistically significant alleviating effect on growth when applied at a concentration of 100 mg B kg−1. However, it did not exhibit a significant alleviating effect at a concentration of 300 mg B kg−1. Nevertheless, the administration of Se did not result in a decrease in the accumulation of plant tissue B. Net photosynthetic rates were not considerably affected by the presence of B or Se. Se did not appreciably ameliorate the oxidative damages induced by high B.