Plant Productions

Effect of Gamma-Amino-Butyric Acid (GABA) Foliar Application on Chilling and Postharvest Quality of Tomato (cv. Newton)

Lolav Zarei; Mahmoud Koushesh Saba; Yavar Vafaee

Volume 43, Issue 2 , September 2020, , Pages 199-212

https://doi.org/10.22055/ppd.2020.27796.1681

Abstract

Abstract Background and Objectives Tomatoes are considered the favorite and most widely consumed vegetables in the world since their fruit is rich in minerals, vitamins and antioxidant ... Read More Abstract Background and Objectives Tomatoes are considered the favorite and most widely consumed vegetables in the world since their fruit is rich in minerals, vitamins and antioxidant compounds. Tomato fruit is harvested after physiological maturity at different color stages based on consumption type. Mature unripe tomato fruit could be stored for long time and be ripened according to market demand, but this tropical product is susceptible to low temperature, which imposes serious constraints in postharvest period and supply chains. Several techniques or chemical treatments have been used to decrease low temperature deleterious effects. Gamma-mino butyric acid (GABA), as an efficient tool, could increase plant resistance to chilling injury (CI) during postharvest life. This study was carried out to evaluate the effect of pre-harvest GABA spray on postharvest quality changes and chilling of tomato fruit during cold storage. Materials and Methods In this study, the effect of pre-harvest application of GABA at three concentrations (0, 5 and 10 mM) on postharvest quality and chilling of tomato cv. Newton was evaluated. The spray was carried out 2 weeks before harvest. Fruits were harvested after physiological maturity when the fruit color changed from pink to red. During storage period at 4 °C and 90-95% relative humidity, some fruit quality attributes such as weight loss, firmness, chilling injury of tomato fruit, soluble solid content (SSC), titratable acidity (TA) and fruit bioactive constituent were analyzed at days 0, 5, 10, 15 and 20. Results Chilling in control fruit was 25% at final assessment, while in 10 mM GABA treatment it was only 8.33% at the same time. GABA treatments decreased the rate of weight loss and retained fruit firmness during storage. Also, vitamin C and titratable acidity in GABA treatments were higher than those of untreated fruit. Fruit lycopene content increased during fruit storage in both treated and untreated fruit, but the value was greater in GABA treatments than the control. SSC increased during fruit storage, but it was greater in control than the treatments. While superoxide dismutase enzyme activity decreased in both treated and untreated fruit, the rate of decline in control fruit was greater than GABA treatments. Discussion Pre-harvest foliar application of GABA ameliorated chilling injury induced by cold storage, maintained quality properties of tomato fruit, and increased lycopene content. GABA treatments probably lessened deteriorate effect of low temperature through keeping fruit cell integrity and higher bioactive constituent levels.

Effect of Gamma-Amino-Butyric Acid Foliar Application on Physiological Characters of Tomato (cv. Namib) under Salinity Stress

L. Zarei; M. Koushesh Saba; Y. Vafaee; T. Javadi

Volume 41, Issue 1 , June 2018, , Pages 15-28

https://doi.org/10.22055/ppd.2018.13547

Abstract

Abstract Background and Objectives Salinity and salt accumulation in the soil surface is one of the most important abiotic stresses that limit agricultural crop production in ... Read More Abstract Background and Objectives Salinity and salt accumulation in the soil surface is one of the most important abiotic stresses that limit agricultural crop production in the arid and semi-arid regions of Iran. Thus, finding an alternative production technique or materials to alleviate stress condition is a research priority. One way to decrease the harmful effects of salinity is the foliar application of some chemicals such as Gamma-amino butyric acid (GABA) to increase plant tolerance to salinity. GABA is often accumulated in plants in response to live and non-live stresses such as drought, salinity, oxygen deficit, heat shocks and contamination of pathogens. Materials and Methods The current study was carried out to monitor the GABA effects on tomato physiological changes under salinity stress. The plants were grown in hydroponic system and received 0 and 50 mM NaCl as control and salinity stress, respectively. GABA at three concentrations 0, 10 and 20 mM was applied as a foliar application in either control or salinity treatments. Physiological characteristics of relative water content (RWC), membrane stability index (MSI), proline, total soluble protein (TSP) and enzymes activity, chlorophyll a, chlorophyll b, total chlorophyll and total soluble carbohydrates (TSC) were measured. Results The results showed that salinity stress and GABA were effective on the physiological characteristics of tomato. GABA can increase the tolerance of plants to environmental stresses, including salinity stress. MSI, chlorophyll a, total chlorophyll, carotenoids in salinity treatments were lower than control while TSC, proline, peroxidase and SOD increased. RWC, MSI, proline, TSC of GABA treated plant were greater than untreated in either salinity or control conditions. Also, SOD and peroxidase activity elevated in GABA treated plant under salinity stress. Discussion GABA increased antioxidant capacity in the plant and thus might eliminate radicals and prevents the destruction of cell membrane tissue, including the chloroplast membrane. In general, the results showed that in salinity stress conditions, GABA application as a compatible osmolytes might improve the tomatoes physiological performance and alleviate salinity stress.

Study the relation of regular bearing fruit schedule with Catecholase and Cresolase enzyme activity in mango (Mangifera indica L.)

M. Shamili; A. Talaii; M.R. Fatahi Moghadam

Volume 36, Issue 3 , December 2013, , Pages 65-75

Abstract

Mango is one of the important fruits in tropical regions of the world. A basic problem of its production is alternate bearing. Observation of phenotypic behaviors at maturity phase ... Read More

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Keywords = Enzyme activity

Effect of Gamma-Amino-Butyric Acid (GABA) Foliar Application on Chilling and Postharvest Quality of Tomato (cv. Newton)

Abstract

Effect of Gamma-Amino-Butyric Acid Foliar Application on Physiological Characters of Tomato (cv. Namib) under Salinity Stress

Abstract

Study the relation of regular bearing fruit schedule with Catecholase and Cresolase enzyme activity in mango (Mangifera indica L.)

Abstract