Insight into 5-aminolevulinic acid-induced modulation of cellular antioxidant metabolism to confer salinity and drought tolerance in maize

Biocell

article

MD. ROBYUL ISLAM¹  TAHIA NAZNIN³  DIPALI RANI GUPTA¹  MD. ASHRAFUL HAQUE¹  MIRZA HASANUZZAMAN⁴  MD. MOTIAR ROHMAN² 

[1] Institute of Biotechnology and Genetic Engineering (IBGE), Bangabandhu Sheikh Mujibur Rahman Agricultural University;Molecular Breeding Laboratory, Plant Breeding Division, Bangladesh Agricultural Research Institute;Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University;Department of Agronomy, Faculty of Agriculture, Sher-e-Bangla Agricultural University

关键词: Maize;    Combined stress;    Salinity;    Drought;    5-aminolevulinic acid;    Oxidative stress;   

DOI  :  10.32604/biocell.2020.011812

学科分类：仪器

来源: Biocell

【 摘 要 】

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 (O 2 •− ) and hydrogen peroxide (H 2 O 2 ). 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 O 2 •− and H 2 O 2 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.

【 授权许可】

CC BY