Humic acid application alleviate salinity stress of bean (Phaseolus vulgaris L.) plants decreasing membrane leakage

Abstract

The effect of varying humic acid supplies (0, 0.05 and 0.1% w/w) on some agro-physiological properties and ionic balance of bean plants in different salt source and doses were investigated. Plants were treated with eight salt sources [sodium chloride (NaCl), sodium sulphate (Na 2 SO 4), calcium chloride (CaCl 2), calcium sulphate (CaSO 4), potassium chloride (KCl), potassium sulphate (K 2 SO 4), magnesium chloride (MgCl 2) and magnesium sulphate (MgSO 4)] in four different concentrations (0, 30, 60, and 120 mM doses) for 60 days in a growth media. The highest salt doses; 120 mM of NaCl, CaCl 2 , MgCl 2 and KCl 2 at no humic acid applications caused plant death, but no plant death was obtained in humic acid application (0.05 and 0.1%) doses in all of the salt types and doses except for CaCl 2. Total chlorophyll and nitrate contents of plants decreased with increasing salt doses, but were negatively related to humic acid application doses. Proline contents of plant were increased with increasing salt doses and the highest value was obtained for NaCl application. The effects of salt concentrations in nitrogen and phosphorus content of plants were significant. Humic acid added to saline soil significantly improved the variables affected by high salinity and also increased plant nitrate, nitrogen and phosphorus, reduced soil electricity conductivity, proline and electrolyte leakage of plant, enhanced plant root and shoot dry weight by allowing nutrients and water to be released to the plant as needed. The result suggested that humic acid have great potential in alleviating salinity stress on plant growth and growth parameter in saline soils of arid and semi-arid areas. This humic acid appeared to be highly effective for soil conditioners in vegetable growth, to improve crop tolerance and growth saline conditions.

Biostimulants Application in Horticultural Crops under Abiotic Stress Conditions

“…It is known that humic acids have a lot of beneficial effect stimulating shoot and root growth and improving environmental stress tolerance even if the exact mechanism of action is not completely clear. These activities were confirmed in several vegetable crops like sweet pepper [170], beans [171] and cucumber [172] grown under different salt stress conditions. Bioactive compounds present in seaweed extracts are able to improve plant tolerance against abiotic stresses too.…”

Papaya seedlings irrigation with saline water in soil with bovine biofertilizer

“…This fact results in decreased intensity of salt toxic effects on growth (Aydin et al, 2012) and increased absorption efficiency of water and essential nutrients (Morard et al, 2011), stimulating plants to grow (Dordas et al, 2008;Matsi et al, 2015).…”

Variation in yield and biochemical factors of German chamomile (Matricaria recutita L.) under foliar application of osmolytes and drought stress conditions

“…HA can play a role as a growth regulator, regulating hormonal levels, improving plant growth, and increasing stress tolerance (15). Humic substances are well known as plant growth stimulants by enhancing absorbance and transport of nutrients, reducing uptake of toxic elements, increasing membrane permeability, respiration, photosynthesis, and phosphate uptake and acting as growth hormones (16). HA foliar application due to increased rubisco activity, photosynthesis and carbohydrate increases tolerance to stress conditions (17) MeJA is considered as a plant hormone.…”