The objective of the current study was to compare the transpiration
rate response of C3 and C4 turfgrasses to increasing VPD at a
stable temperature. If a difference in response to VPD is observed
between C3 and C4 turfgrasses, this could be an important contributing
factor in defining climate zones of adaptability. That is,
sensitivity to increasing VPD, which is commonly associated with
elevated temperature, might contribute to the lack of success of a
species in warm-temperature climate zone.