Preprint Article Version 2 This version is not peer-reviewed

Foliar Application of Y-Aminobutyric Acid (GABA) Improves Vegetative Growth, and the Physiological and Antioxidative Potential of Daucus Carota L. under Water Deficit Conditions

Version 1 : Received: 23 March 2019 / Approved: 25 March 2019 / Online: 25 March 2019 (11:51:41 CET)
Version 2 : Received: 27 March 2019 / Approved: 28 March 2019 / Online: 28 March 2019 (11:15:50 CET)

How to cite: Bashir, R.; Riaz, H.N.; Shafiq, M.; Parveen, N.; Alenazi, M.M.; Anwar, S.; Alebidi, A.I. Foliar Application of Y-Aminobutyric Acid (GABA) Improves Vegetative Growth, and the Physiological and Antioxidative Potential of Daucus Carota L. under Water Deficit Conditions. Preprints 2019, 2019030227 (doi: 10.20944/preprints201903.0227.v2). Bashir, R.; Riaz, H.N.; Shafiq, M.; Parveen, N.; Alenazi, M.M.; Anwar, S.; Alebidi, A.I. Foliar Application of Y-Aminobutyric Acid (GABA) Improves Vegetative Growth, and the Physiological and Antioxidative Potential of Daucus Carota L. under Water Deficit Conditions. Preprints 2019, 2019030227 (doi: 10.20944/preprints201903.0227.v2).

Abstract

Scarcity of water is one of the most serious concerns in plant biology with diverse implications at all the levels of molecular, biochemical, and physiological phenomena of plant growth, development, and consequently the productivity. Most of the strategies to induce or enhance drought tolerance in plants are unreasonably expensive and/or time-consuming. Some studies conducted in the recent past have shown that plant growth regulators (PGRs) may induce/improve physiological tolerance in plants to cope with adverse environmental conditions including drought. The present study was aimed at investigating the effects of foliar spray of GABA (0, 1, 2, and 4 mM) applied 20 days following the germination of seeds, on vegetative growth, morphological characteristics, integrity of cell-membrane, and the levels of photosynthetic pigments and enzymatic antioxidants in carrot cvs. Supertaj and Bharat, grown under 100% and 50% field capacity of soil moisture. The treated and untreated (control) carrot plants were harvested and analyzed 2 weeks following the GABA application. The results revealed that foliar application of GABA improved the vegetative growth and significantly increased the levels of free amino acids, plastid pigments, enzymatic antioxidants, and the relative water content in the root crop grown under 50% field capacity of soil moisture, compared to control. Additionally, the GABA application decreased the electrolyte leakage of ions and melondialdehyde (MDA) content in carrot leaves. The carrots harvested from GABA-treated or untreated (control) plants were not significantly different for their protein contents. In conclusion, the incorporation of GABA in the production management of carrots may help plants to mitigate the adverse effects of water deficit stress.

Subject Areas

oxidative stress; enzymatic antioxidants; malondialdehyde; membrane permeability; chlorophyll

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