“High Temperature Has a More Significant Inhibitory Effect on Chrysanthemum Seedling Photosynthesis than Relative Humidity, but Increasing Relative Humidity to 70% Can Alleviate This Impact at 35°C or Above” could be shortened to: “High Temperature’s Inhibitory Effect on Chrysanthemum Seedling Photosynthesis and Relative Humidity’s Mitigation”

“Walnut Response to Pantoea agglomerans Infection Involves Changes in Metabolism, Hormone Signaling, and Activation of Disease Resistance Pathways” (all lowercase) or simply “Walnut response to Pantoea agglomerans infection” (no title case) can be a suitable title for the text. The first option reflects the full title of the research article, while the second one provides a concise summary.