Maize Tolerance against Drought and Chilling Stresses Varied with Root Morphology and Antioxidative Defense System
Open Access
- 6 June 2020
- Vol. 9 (6), 720
- https://doi.org/10.3390/plants9060720
Abstract
Maize belongs to a tropical environment and is extremely sensitive to drought and chilling stress, particularly at early developmental stages. The present study investigated the individual and combined effects of drought (15% PEG-Solution) and chilling stress (15/12 °C) on morpho-physiological growth, osmolyte accumulation, production of reactive oxygen species (ROS), and activities/levels of enzymatic and non-enzymatic antioxidants in two maize hybrids (i.e., “XD889” and “XD319”) and two inbred cultivars (i.e., “Yu13” and “Yu37”). Results revealed that individual and combined exposure of drought and chilling stresses hampered the morpho-physiological growth and oxidative status of maize cultivars, nevertheless, the interactive damage caused by drought + chilling was found to be more severe for all the studied traits. Between two individual stress factors, chilling-induced reductions in seedling length and biomass of maize cultivars were more compared with drought stress alone. Greater decrease in root length and biomass under chilling stress ultimately decreased the volume and surface area of the root system, and restricted the shoot growth. All the stress treatments, particularly chilling and drought + chilling, triggered the oxidative stress by higher accumulation of superoxide anion, hydrogen peroxide, hydroxyl ion, and malondialdehyde contents compared with the control. Variations in response of maize cultivars were also apparent against different stress treatments, and XD889 performed comparatively better than the rest of the cultivars. The better growth and greater stress tolerance of this cultivar was attributed to the vigorous root system architecture, as indicated by higher root biomass, root surface area, and root volume under drought and chilling stresses. Moreover, efficient antioxidant defense system in terms of higher total antioxidant capability, superoxide dismutase, peroxidase, catalase, and glutathione reductase activities also contributed in greater stress tolerance of XD889 over other cultivars.Keywords
This publication has 42 references indexed in Scilit:
- Low temperature impact on photosynthetic parameters of coffee genotypesPesquisa Agropecuária Brasileira, 2009
- Chilling tolerance in maize: agronomic and physiological approachesCrop and Pasture Science, 2009
- Dehydrin gene expression provides an indicator of low temperature and drought stress: transcriptome-based analysis of Barley (Hordeum vulgare L.)Functional & Integrative Genomics, 2008
- An early response regulatory cluster induced by low temperature and hydrogen peroxide in seedlings of chilling-tolerant japonica riceBMC Genomics, 2007
- Reactive oxygen species and temperature stresses: A delicate balance between signaling and destructionPhysiologia Plantarum, 2005
- Yellow Stripe1. Expanded Roles for the Maize Iron-Phytosiderophore TransporterPlant Physiology, 2004
- Antioxidative defense system in an upland rice cultivar subjected to increasing intensity of water stress followed by recoveryPhysiologia Plantarum, 2003
- Drought enhances chilling tolerance in a chilling‐sensitive maize (Zea mays) varietyNew Phytologist, 1996
- Changes in Leaf Water Relations and Injuries in Maize Seedlings Induced by Different Chilling ConditionsJournal of Agronomy and Crop Science, 1994
- EFFECT OF SOIL WATER AND TEMPERATURE ON CORN (Zea mays L.) ROOT GROWTH DURING EMERGENCECanadian Journal of Soil Science, 1986