Stomate closure in darkened environment,at time zero,with air (0.03% CO₂)or CO₂-free airflow through leaf.(Note: A decrease in conductance indicates inactivation of the proton pump.)

Question

Quizplus · Accepted Answer

This experiment supports only Hypothesis II, which states that proton pumping is necessary for stomatal opening. The fact that there was a decrease in conductance (inactivation of the proton pump) indicates that the lack of COS-free airflow inhibited the proton pump, leading to stomate closure. This experiment does not provide any evidence supporting Hypothesis I, which postulates that elevated levels of COS stimulate stomatal opening.

Stomate Closure in Darkened Environment,at Time Zero,with Air (0