FigureĀ 7.
Relationship between shoot water potential and stomatal conductance/carbon exchange rate of alfalfa cultivars grouped into fall dormant, non-fall dormant or highly non-fall dormant dormancy groups. Plants received either 100 % (open circles) or 25 % (closed circles) of their water requirement over 35 days. A logistical function was fitted to the data (solid line). The vertical broken line indicates shoot water potentials at which a 50 % decline in carbon exchange rate and a 90 % decline in stomatal conductance (stomatal closure) occurred. The grey areas represent the standard errors around these estimates.