First insight of exogenous addition of proline and glycinebetaine to mitigate fluorine toxicity effects on common bean seedlings

Abstract

To counteract fluoride (F) stress-induced adverse effects on plants, one approach is the application of exogenous potential osmoprotectants such as proline (Pro) and glycinebetaine (GB). This experiment was carried out to evaluate the effects of exogenous application of Pro and GB on germination and growth of common bean seeds after potassium fluoride (KF) and sodium fluoride (NaF) exposure. The study was replicated under two different temperatures: the normal temperature required for seeds growth (20°C) and a higher (25°C) favorable for bean cultivation in Africa, the region most polluted with F. The results indicated that the beneficial effects of external supply of Pro and GB varied depending on temperature and the source of salt stress. NaF showed a more toxic effect than KF on growth of Phaseolus vulgaris seeds. Overall, Pro was more effective than GB to alleviate the undesirable effect of salt stress on morphological attributes under NaF stress (improving by 50% and 39% the length and the number of lateral roots), and especially at higher temperature the recovery role of Pro and GB was more relevant reaching the same value found under control conditions for the length of hypocotyl (3.28 cm).

Endogenous calcium mediates seedling growth and fluoride stress tolerance in four bean genotypes

“…In this study, partial inhibition of germination was observed in African bean genotypes under KF200, while a stronger effect was observed under NaF200 where even germination was completely inhibited. Similar results describing a more toxic effect of NaF than KF on bean growth were reported by Chahine et al (2021). The higher toxicity of NaF than KF could be explained by a possible synergistic effect of Na and F together causing the inhibition of vital systems in plants.…”

Endogenous Calcium Mediated The Seedling Growth And Fluoride Stress Tolerance In Four Bean Genotypes

“…In this study, partial inhibition of germination was observed in African bean genotypes under KF200, while a stronger effect was observed under NaF200 where even germination was completely inhibited. Similar results about a more toxic effect of NaF than KF on bean growth have been reported by Chahine et al (2021). The higher toxicity of NaF than KF could be justi ed by a possible synergistic effect of Na and F together causing the inhibition of vital systems in plants.…”