Drought Tolerance Increases with Age in Plants: Evidence from MDA Accumulation and EBL Mitigation of Lipid Peroxidation

This study reveals an age-dependent response to drought stress in plants, with older plants exhibiting greater tolerance. The extent of membrane lipid peroxidation, measured by malondialdehyde (MDA) accumulation, was used as an indicator of drought-induced damage. Results demonstrate that under drought conditions, 7-month-old plants showed a lower increase in MDA levels compared to 5-month-old plants, which in turn exhibited a lower increase than 3-month-old plants. This suggests that older plants possess enhanced mechanisms to combat drought-induced oxidative stress.

Furthermore, the application of exogenous betaine aldehyde (EBL) effectively mitigated membrane lipid peroxidation in all age groups, highlighting its potential as a protective agent against drought stress. Interestingly, the degree of EBL-mediated alleviation also exhibited an age-dependent pattern, with older plants showing greater responsiveness to EBL treatment. This suggests that the age-dependent drought tolerance in plants might be associated with an increased ability to utilize exogenous protectants like EBL.

These findings contribute to our understanding of plant responses to drought stress and highlight the importance of considering plant age in developing effective strategies for mitigating the impacts of drought on agricultural productivity.