As global temperatures continue to rise, heat stress has become a major limiting factor in lettuce production, affecting plant growth, yield, and quality. This research evaluates an extensive genetic pool of lettuce and how lettuce performs under high-temperature conditions in two distinct soil systems, offering a clearer understanding of how environmental and soil-related factors interact to influence crop outcomes.
The study compares lettuce growth and productivity across the two soil systems under controlled heat stress conditions. Results demonstrate that soil characteristics play a significant role in moderating plant responses to heat, influencing factors such as water retention, nutrient availability, and root development. Differences in plant performance between the systems suggest that soil management practices can either mitigate or exacerbate the negative effects of high temperatures.
In addition to soil impacts, the research identifies variation in heat tolerance among lettuce genotypes. Some varieties maintained better growth and physiological performance under stress, pointing to the potential for selecting and developing heat-tolerant cultivars. These findings underscore the importance of integrating genetic improvement with optimized soil management to sustain lettuce production in warmer climates.
The study also highlights key physiological traits associated with improved heat tolerance, providing valuable targets for plant breeders. By focusing on these traits, breeding programs can accelerate the development of lettuce varieties better suited to future growing conditions.
Overall, the research offers a comprehensive look at how soil systems and genetic factors interact under heat stress, delivering actionable insights for growers, researchers, and the agricultural industry. The findings support a combined approach that leverages both soil management and plant breeding to enhance crop resilience and maintain productivity in the face of climate change.
The study was initiated by Gustavo Kreutz and Jesse Murray, PhD graduate
students mentored by Germán Sandoya in the lettuce breeding program and then
continued under the work of Hannah Mather who was co-mentored by Germán Sandoya and Kevin Begcy while Dr. Sandoya was at the University of Florida.
Currently, Dr. Germán Sandoya is the Endowed Chair in Raspberry Breeding and Associate Professor in Breeding and Genetics at the Northwestern Washington Research and Extension Center at Washington State University.
The full article can be found on the Journal of the American Society for Horticultural Science electronic journal website at: https://doi.org/10.21273/JASHS05586-26
Established in 1903, the American Society for Horticultural Science is recognized around the world as one of the most respected and influential professional societies for horticultural scientists. ASHS is committed to promoting and encouraging national and international interest in scientific research and education in all branches of horticulture.
Comprised of thousands of members worldwide, ASHS represents a broad cross-section of the horticultural community – scientists, educators, students, landscape and turf managers, government, extension agents and industry professionals. ASHS members focus on practices and problems in horticulture: breeding, propagation, production and management, harvesting, handling and storage, processing, marketing and use of horticultural plants and products. To learn more, visit ashs.org.
