Contrasting temporal responses of growth, photosynthesis and antioxidant defence to nitrogen supply in two table grape cultivars.
- Open access
Red Globe maintains stable growth, photosynthesis, and antioxidant defenses across nitrogen levels, while Crimson Seedless shows stress responses and growth suppression at high nitrogen.
- Why it matters: Understanding cultivar-specific nitrogen responses is essential for optimizing grapevine nutrition and preventing stress-related damage, yet detailed temporal dynamics remain unclear.
- What they did: The study compared growth, photosynthesis, and biochemical responses of 'Red Globe' and 'Crimson Seedless' under four nitrogen levels over 75 days, using heatmaps and PCA to analyze physiological traits.
- The result: Findings reveal that Red Globe exhibits broader nitrogen tolerance with stable physiological traits, whereas Crimson Seedless is more sensitive, showing early antioxidant decline and stress indicators, guiding cultivar-specific nitrogen management strategies.