Foliage applications of jasmonic acid modulate the antioxidant defense under water deficit growth in sugar beet

Hamideh Ghaffari,Muhammad Nadeem,Mumtaz Cheema,Jamshid Razmjoo,Mahmoud R Tadayon

doi:10.5424/sjar/2019174-15380

Abstract

Aims of study: Water deficit (WD) is becoming an alarming problem in many regions of the world. Jasmonic acid (JA) is considered an important intracellular plant growth regulator. The aim of the current research was to investigate the important role of JA in mitigating the negative effects of WD on plant growth.Area of study: Sugar beet production systems of two locations in Chaharmahal-Bakhtiari province, Iran.Material and methods: A field trial was conducted to assess the foliar applications of JA (0, 5 µM and 10 µM) and WD (50%, 75%, 100% plant water requirements) effects on physiological yield components of sugar beet (Beta vulgaris L.) plants.Main results: WD significantly (p<0.05) increased catalase, ascorbate and peroxidase activities, and malondialdehyde, hydrogen peroxide and white sugar content (WSC); however, it caused a reduction in white sugar yield and root yield (RY). JA foliage applications further enhanced the enzymes activity in WD treated plants resulting in higher WSC, potassium concentrations, white sugar and final RY. Interestingly the effects of JA applications were more pronounced under severe WD (50%) compared to mild (75%) or well-watered plants (100%). JA (10 µM) foliage applications increased the RY and white sugar production by 21% and 24% under severe WD.Research highlights: JA can ameliorate the adverse effects of WD and increase the WD tolerance of sugar beet crop by upregulating the antioxidant enzyme activities to withstand adverse environmental conditions.

Highlights

Crop plants face different abiotic stresses during their growth cycle (Leufen et al, 2016); water deficit (WD) is considered the most deleterious among all abiotic stresses, that limits the plant growth and final productivity in agricultural crop systems worldwide (Leufen et al, 2016; Liu et al, 2018; Ghaffari et al., 2019)
The estimated MDA value is commonly utilized to measure the lipid peroxidation as an index of the membrane damage caused by drought (Lin & Kao, 2000)
Index is a consequence of higher oxidative stress under drought stress (Nazarli et al, 2014)

Summary

Introduction

Crop plants face different abiotic stresses during their growth cycle (Leufen et al, 2016); water deficit (WD) is considered the most deleterious among all abiotic stresses, that limits the plant growth and final productivity in agricultural crop systems worldwide (Leufen et al, 2016; Liu et al, 2018; Ghaffari et al., 2019). Such adverse changes cause cell membrane damages in plants (Moussa & AbdelAziz, 2008; Cunhua et al, 2010), resulting in lower final productivity in agricultural systems. Oxidative defense systems include enzymatic antioxidants such as catalase (CAT), ascorbate peroxidase (APX), superoxidase dismutase (SOD) and peroxidase (POX), whereas non-enzymatic antioxidants include lower mo

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Conclusion