Effects of Elevated Atmospheric Co2, Environmental Stress, and Edaphic Conditions on Bioactive Compounds in Brassica Crops
Food Components and Health Laboratory
Project Number: 8040-53000-017-00
Start Date: Aug 09, 2010
End Date: Aug 08, 2015
Objective 1: Determine the impact of environmental factors of anticipated climate change (e.g., elevated CO2, increased and widely varying temperature, and changes of moisture) on the amounts and types of phytochemicals at harvest, and the persistence of these compounds postharvest, such as during storage at low temperatures, for Brassica crops.
• Sub-objective 1.A. Variety Testing. Evaluate genetically-diverse varieties of kale and broccoli for their responses to elevated temperatures and elevated CO2.
• Sub-objective 1.B. Soil Moisture. Using kale and broccoli varieties, evaluate effects of periodic drought or periodic flooding during cultivation at ambient or elevated CO2 and ambient or elevated temperature regimes.
• Sub-objective 1.C. Postharvest. Using kale and broccoli varieties, determine if elevated CO2 and/or elevated temperature during growth alter the persistence of phytochemicals during postharvest storage at low temperature.
Objective 2: Determine the extent to which soil fertility, CO2, and other environmental stresses, and their interactions, affect changes of phytochemical composition of Brassica crops.
• Sub-objective 2.A. Soil Nitrogen. Using kale and broccoli varieties, evaluate effects of low, intermediate, and high soil N during cultivation at ambient or elevated CO2 and ambient or elevated temperature regimes.
Interaction between atmospheric carbon dioxide and other environmental parameters will be investigated in two controlled environments (growth chambers and greenhouses) by raising crops to seed while regulating and monitoring atmospheric CO2, temperature, soil moisture, nutrition, and photosynthetically as well as photomorphogenetically active radiation. Growth chambers will simulate natural conditions. Environmental conditions at various developmental stages will be monitored and compared to those in controlled environments. Work will concentrate on kale (collards) and broccoli. Seeds will be harvested and analyzed by HPLC for important biologically active constituents, including glucosinolates. Effects of environment on biosynthethic pathways will be evaluated.