Location: Plant Science Research
Project Number: 6070-11000-010-16-R
Project Type: Reimbursable Cooperative Agreement
Start Date: Oct 1, 2020
End Date: Sep 30, 2021
This project will characterize a leaf gas exchange trait in soybean breeding lines developed by collaborators on a grant funded by the United Soybean Board.
The project will screen soybean breeding lines for a leaf gas exchange trait that limits water loss from transpiration (contributing to drought tolerance) and reduces ozone uptake (contributing to ozone tolerance). The focus will be on 14 breeding lines previously developed from a cross between plant introductions (Fiskeby III and Fiskeby V) both known to be drought and ozone tolerant and an elite cultivar (Holladay) known to be sensitive to both stresses. These breeding lines have been tentatively identified as stress tolerant. The lines will be grown in field plots (to test for drought response) and in open-top chambers (to test for ozone response). Portable leaf gas exchange instruments will be used to measure photosynthesis and stomatal conductance at critical developmental stages. The results will be assessed in relation to yield response under stress conditions.