Abstract
Humic and oxalic acids have the effects of promoting plant growth. We test whether they are able to positively impact wheat yield under newly reclaimed sandy soil, where water deficiency negatively influences yield. Foliar application of humic acid and oxalic acid on two wheat cultivars, Gemiza-9 and Sakha-93, leads to overall better performance of the plants and increases the yield significantly, irrespective of the cultivar genetic background. However, Gemiza-9 surpassed Sak- ha-93 in grain yield parameters. The highest values of grain and protein yields/ha were obtained in both cultivars, when the plants were sprayed with a combination of 17 mg/L humic acid and (300 mg/L) oxalic acid. Humic and oxalic acid showed accumulative yield-promoting effect. To understand the mechanism by which humic and oxalic acids promoted grain yield, we performed SDS-PAGE followed by MS-MS-LC analyses. We identified a unique humic acid-induced 52 KDa band in Gemiza-9. The band contained three major proteins, Ribulose bisphosphate carboxylase large chain, ADP-glucose synthase and NADP-dependent glyceraldehyde-3-phosphate dehydrogenase (GAPN). Thus humic acid increased the activity of plastid enzymes involved in photosynthesis, sucrose biosynthesis and starched accumulation to improve the overall performance of the plant.
Highlights
How to cite this paper: El-Shabrawi, H.M., et al (2015) Humic and Oxalic Acid Stimulates Grain Yield and Induces Accumulation of Plastidial Carbohydrate Metabolism Enzymes in Wheat Grown under Sandy Soil Conditions
The activity and content of the key enzyme of carbon metabolism, Ribulose bisphosphate carboxylase/oxygenase (Rubisco; EC 4.1.1.39), is a major factor determining the inhibition of photosynthetic carbon dioxide assimilation under water stress [2]-[5]
During the initial stages of photosynthetic metabolism, the ratio of carbohydrate and non-carbohydrate pathways of metabolism are determined by the activity of nicotinamide adenine dinucleotide phosphate (NADP), glyceraldehyde-phosphate dehydrogenase (GAPDH) and phosphoenolpyruvate carboxylase (PEPK)
Summary
How to cite this paper: El-Shabrawi, H.M., et al (2015) Humic and Oxalic Acid Stimulates Grain Yield and Induces Accumulation of Plastidial Carbohydrate Metabolism Enzymes in Wheat Grown under Sandy Soil Conditions. The water is the major limiting factor for plant growth Such stress may lead to reduce plant growth by affecting various physiological and biochemical processes, such as photosynthesis, respiration, translocation, ion uptake, carbohydrates, nutrient metabolism and growth promoters [1]. The advantages of bio-stimulants, such as humic acid, lie in their ability to promote hormonal activity in plants as well as promote antioxidant production in plants which, in turn, reduces free radicals It is involved in increasing root vitality, chlorophyll biosynthesis, and seed germination rate, and improve nutrients uptake [11]. Gemiza-9 and Sakha-93 varieties to improve growth, yield and grain quality under drought stress
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