A NOVEL ROOT TRAIT TO IMPROVE MAIZE DROUGHT TOLERANCE AND CARBON SEQUESTRATION: LIGNIFIED OUTER CORTICAL PARENCHYMA CELLS

Objectives: We have recently discovered that genetic variation for outer cortical cell traits in maize is associated with substantial variation in plant performance in dry, hard soils. Small outer cortical sclerenchyma cells with thick cell walls (MCS, multiseriate cortical sclerenchyma) display variation in root growth and water acquisition under drought. The overall objective of this project is to evaluate and develop this trait as a tool to improve drought resistance and carbon sequestration in maize, with potential application to other crops. Specifically, we will:1. Confirm the physiological utility of MCS to improve plant water status and growth under drought in field and greenhouse environments.2. Identify genetic loci underlying natural variation in MCS and develop stocks that will support mechanistic assessment of its regulation and utility. 3. Evaluate the utility of MCS for improved carbon sequestration from the atmosphere into deep soil domains.