[Effects of CdCl2 on grape root mitochondrial characteristics and root activity]

Area of Science:

• Plant Physiology
• Environmental Toxicology
• Biochemistry

Context:

• Cadmium (Cd) contamination poses a significant threat to agricultural productivity, particularly affecting vital crop species like grapes.
• Understanding the physiological and biochemical responses of different grape cultivars to cadmium stress is crucial for developing mitigation strategies.

Purpose:

• To investigate the impact of cadmium chloride (CdCl2) on root mitochondrial functions and activity in four distinct grape cultivars.
• To compare the sensitivity and tolerance levels of Kyoho, Muscat Hamburg, Long Yan, and Ze Xiang grape cultivars to cadmium exposure.

Summary:

• Exposure to 0.5 mmol CdCl2/L increased root mitochondrial hydrogen peroxide (H2O2) and membrane permeability transition pore (MPTP) opening, while decreasing membrane potential (Deltapsi) and cytochrome C (Cyt c) content across all cultivars.
• Significant variations in H2O2, Cyt c, root activity, MPTP, and Deltapsi were observed among the cultivars, with Kyoho showing higher sensitivity and Long Yan demonstrating greater tolerance to Cd stress.
• CdCl2 treatment led to a dose-dependent decrease in root activity and mitochondrial integrity, with cultivar-specific differences in susceptibility.

Impact:

• Identifies Long Yan as a potentially more cadmium-resilient grape cultivar, offering insights for breeding programs and agricultural management in contaminated areas.
• Provides a detailed molecular-level understanding of cadmium-induced oxidative stress and mitochondrial dysfunction in grapevines.
• Highlights the importance of cultivar selection in mitigating the negative effects of heavy metal contamination on grape production.