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Stress Sensitivity Is Associated with Differential Accumulation of Reactive Oxygen and Nitrogen Species in Maize Genotypes with Contrasting Levels of Drought Tolerance
- Source :
- International Journal of Molecular Sciences, Volume 16, Issue 10, Pages 24791-24819, International Journal of Molecular Sciences, Vol 16, Iss 10, Pp 24791-24819 (2015)
- Publication Year :
- 2015
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2015.
-
Abstract
- Drought stress decreases crop growth, yield, and can further exacerbate pre-harvest aflatoxin contamination. Tolerance and adaptation to drought stress is an important trait of agricultural crops like maize. However, maize genotypes with contrasting drought tolerances have been shown to possess both common and genotype-specific adaptations to cope with drought stress. In this research, the physiological and metabolic response patterns in the leaves of maize seedlings subjected to drought stress were investigated using six maize genotypes including: A638, B73, Grace-E5, Lo964, Lo1016, and Va35. During drought treatments, drought-sensitive maize seedlings displayed more severe symptoms such as chlorosis and wilting, exhibited significant decreases in photosynthetic parameters, and accumulated significantly more reactive oxygen species (ROS) and reactive nitrogen species (RNS) than tolerant genotypes. Sensitive genotypes also showed rapid increases in enzyme activities involved in ROS and RNS metabolism. However, the measured antioxidant enzyme activities were higher in the tolerant genotypes than in the sensitive genotypes in which increased rapidly following drought stress. The results suggest that drought stress causes differential responses to oxidative and nitrosative stress in maize genotypes with tolerant genotypes with slower reaction and less ROS and RNS production than sensitive ones. These differential patterns may be utilized as potential biological markers for use in marker assisted breeding.
- Subjects :
- Antioxidant
medicine.medical_treatment
maize seedlings
Drought tolerance
Biology
Photosynthesis
Zea mays
Article
Catalysis
Inorganic Chemistry
lcsh:Chemistry
chemistry.chemical_compound
medicine
Physical and Theoretical Chemistry
Molecular Biology
lcsh:QH301-705.5
Spectroscopy
Reactive nitrogen species
chemistry.chemical_classification
reactive oxygen species
Reactive oxygen species
Chlorosis
Organic Chemistry
fungi
drought stress
Wilting
food and beverages
General Medicine
Droughts
Computer Science Applications
reactive nitrogen species
chemistry
Agronomy
lcsh:Biology (General)
lcsh:QD1-999
Seedlings
Adaptation
Subjects
Details
- Language :
- English
- ISSN :
- 14220067
- Database :
- OpenAIRE
- Journal :
- International Journal of Molecular Sciences
- Accession number :
- edsair.doi.dedup.....3081fb3c556c12762cf87cc51618bc6a
- Full Text :
- https://doi.org/10.3390/ijms161024791