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differences between two Penstemon species and
D.R. Campbell. In press. Physiological differences between two
Penstemon species and their hybrids in field and common garden
environments. New Phytologist.
to Penstemon Research Topics:
Links to Additional Research Topics:
We examined a hybrid
zone between Penstemon newberryi and P. davidsonii along
an elevational gradient in the eastern Sierra Nevada, CA, measuring traits
of parents and hybrids in their native environment and in a common garden.
We measured stem
water potential, specific leaf area, phenology, and gas exchange rates
of both species and naturally occurring hybrids. We also measured gas
exchange rates on seven different hybrid crosses as well as the two pure
Alpine P. davidsonii
had less negative pre-dawn and mid-day water potential, and lower water-use-efficiency
than its montane relative, P. newberryi. The alpine species also
took less time to produce mature fruits. Hybrids were intermediate for
most characters, but gas exchange traits differed depending on the genetic
background of the hybrid.
Physiological differences between parents and hybrids may vary depending on the genotype of the hybrid and on environmental conditions.
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