Vol.44, No.4, 2020, pp.713-730, doi:10.32604/biocell.2020.011812
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ARTICLE
Insight into 5-aminolevulinic acid-induced modulation of cellular antioxidant metabolism to confer salinity and drought tolerance in maize
  • MD. ROBYUL ISLAM1,4, TAHIA NAZNIN2, DIPALI RANI GUPTA3, MD. ASHRAFUL HAQUE1, MIRZA HASANUZZAMAN3,*, MD. MOTIAR ROHMAN4,*
1 Institute of Biotechnology and Genetic Engineering (IBGE), Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, 1706, Bangladesh
2 Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, 1706, Bangladesh
3 Department of Agronomy, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, 1207, Bangladesh
4 Molecular Breeding Laboratory, Plant Breeding Division, Bangladesh Agricultural Research Institute, Gazipur, 1701, Bangladesh
* Address correspondence to: Mirza Hasanuzzaman, ; Motiar Rohman,
(This article belongs to this Special Issue: )
Received 30 May 2020; Accepted 24 August 2020; Issue published 24 December 2020
Abstract
The current study investigated the comparative oxidative damage in two maize seedlings induced by saline, drought, and combined stress and the ameliorative role of two different doses (20 and 80 µM) of 5-aminolevulinic acid (ALA) against the above-mentioned stresses. Hydroponically grown 10-day-old maize (Zea mays, var. BARI Hybrid Maize-7 (BHM-7) and BARI Hybrid Maize-9 (BHM-9)) seedlings were exposed to 12 dS/m of saline solution, 200 mM mannitol-induced drought stress alone and their combined stress for 7 days. Result revealed that individual stresses retard the plant growth to some degrees; however, their combined stress has more detrimental effects, which might be correlated with lipid peroxidation (MDA)-induced oxidative stress in seedlings, enhanced Na+ /K+ ratio, and augmented generation of superoxide (O2•− ) and hydrogen peroxide (H2O2). In contrast, exogenous ALA supplementation at 20 µM concentration markedly recovered from chlorosis and growth inhibition, substantially scavenged reactive oxygen species (ROS) and MDA by preserving ionhomeostasis and relaxing oxidative stress; also, by boosting catalase (CAT) and glutathione S-transferase (GST), and exclusively via depressing the activity of lipoxygenase (LOX) antioxidant enzyme. On the contrary, 80 µM ALA made things worse; nevertheless, higher activities shown by other antioxidant enzymes; like, superoxide dismutase (SOD), ascorbate peroxidase (APX), peroxidase (POD), and glutathione peroxidase (GPX), which were related to lessen the oxidative damage by highly produced O2•− and H2O2 under combined stress. Non-denaturing gel electrophoresis was done for further confirmation. However, ALA importantly increased the photosynthetic pigment contents in both genotypes irrespective of doses. Nevertheless, GST might have assisted the plants to escape from the herbicidal effect by detoxification. However, in the combined stress condition, high ALA concentration may have some positive role to play. Our findings also showed that BHM-9 performed better than BHM-7. Therefore, ALA at lower concentration was effective for single stress of saline and drought, while higher concentration can improve plant survival under combined stress.
Keywords
Maize, Combined stress, Salinity, Drought, 5-aminolevulinic acid, Oxidative stress
Cite This Article
ISLAM, M. R., NAZNIN, T., GUPTA, D. R., HAQUE, M. A., HASANUZZAMAN, M. et al. (2020). Insight into 5-aminolevulinic acid-induced modulation of cellular antioxidant metabolism to confer salinity and drought tolerance in maize. BIOCELL, 44(4), 713–730.
Citations
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