Impact of Light Intensity and Leaf Temperature on Photosynthesis in Zea mays

This study investigates the impact of high leaf temperatures (Tleaf) and high light irradiance on the photosynthesis rates of attached maize (Zea mays) leaves. Using infrared gas analyzers (IRGAs) for attached leaf gas exchange measurements, the research focuses on how maize plants respond to abiotic stress factors, which are crucial for determining crop growth and yields. Results show that the assimilation rate and stomatal conductance decrease at high light irradiance while transpiration remains stable. Conversely, the assimilation rate declines at elevated leaf temperatures, specifically around 41°C, but stomatal conductance and transpiration rates increase. These findings indicate that high Tleaf and light irradiance significantly affect the photosynthetic performance of maize, potentially impacting growth and yield. The ultimate goal of this research is to develop maize lines that are optimized for yield in arid environments. This is crucial for improving crop productivity in areas facing high temperature and light stress, contributing to food security in challenging climates. The study's insights into the physiological responses of maize to these stressors can guide the development of more resilient crop varieties.