Abstract:
Salinity becomes a serious threat when soluble salts occur in excessive concentrations in the soil or water and can severely effect plant growth and yield. This adverse effect of salt stress appears on whole plant level at almost all growth stages including germination, seedling, vegetative and maturity stages. The aim of this study was to investigate the effect of gibberellic acid and indole acetic acid in terms of morpho-physiological characters of dill (Anethum graveolens L.) under salt stress. Although plant response to salinity depends on several factors; however, PGR are important substances that are critical in modulating plant responses that eventually lead to adaptation to salinity. Both GA and IAA has positive impact on plant growth through the effect on cell division and elongation. Dill (Anethum graveolens L.) is an aromatic plant has a potential value as a medicinal herb and spice vegetable used extensively in food and pharmacology. The trial was designed as CRD (completely randomized design) with four factors (NaCl, NaCl + IAA, NaCl + GA, NaCl +IAA+GA).The pot experiment was conducted which consist of 60 pots with three replicates and five treatments.Five different levels of sodium chloride with growth regulator level (IAA, 15 µM; GA, 15µM) were used in this trail. The salt treatment included, control, 50mM, 100mM, 150mM and 200mM level. Results indicated that Anethum graveolens have shown the better tolerance under salinity stress at moderate level and under high salt levels causes a slight reduction in growth parameters (plant height, shoot length, root length and no of leaves) and showed that plant adaptive behavior against stress. With the application of IAA under saline soil showed better results by elevating plant fresh and dry matter than untreated plants under salinity. Results showed that salt caused remarkable changes in some anatomical parameters. Microscopic studies showed that anatomical characters like stem epidermal thickness and vascular bundle area negatively impacted by salinity as compared to IAA and combine dose of GA and IAA that showed enhancement in several anatomical parameters. Root anatomical characters indicated expansion in cortical thickness (enhancing water storage) and vascular bundles (elevating water conduction). Physiological parameters like photosynthetic pigments exhibited marked reduction under salinity as compared to plants treated with PGRs.
Page(s):
139-139
DOI:
DOI not available
Published:
Journal: Abstract Book on Global Science Technology and Management Conference, Volume: 0, Issue: 0, Year: 2023
Keywords:
Salt stress
,
Gibberellic acid
,
indole acetic acid
,
Anethum graveolens