Height-related trends in stomatal sensitivity to leaf-to-air vapour pressure deficit in a tall conifer

Journal of Experimental Botany
D R WoodruffKatherine A McCulloh

Abstract

Stomatal responses to leaf-to-air vapour pressure deficit (LVPD), leaf water potential components, and cuticular properties were characterized for Douglas-fir (Pseudotsuga menziesii) foliage collected from tree tops along a height gradient from 5 m to 58 m in order to explore height-related trends in stomatal sensitivity to LVPD and to investigate the role of bulk leaf turgor and leaf cuticle thickness in determining stomatal behaviour. There were three distinct phases in the response of stomatal conductance (g(s)) to changes in LVPD. At low LVPD, g(s) increased with increasing LVPD (phase one). During the second phase, g(s) was maximal at low to intermediate LVPD and during the third phase g(s) declined steadily as LVPD increased. The responsiveness of g(s) to LVPD exhibited a height-related pattern such that maximum g(s) (g(s-max)) occurred at progressively greater LVPD with increasing height (r2=0.55, P=0.006). Bulk leaf osmotic potential at full turgor decreased with height (r2=0.77, P=0.00016), and LVPD at g(s-max) and at maximum crown conductance (g(c-max)) in the field were significantly correlated with leaf turgor (r2=0.92, P=0.0093). Cuticle thickness increased by 0.044 microm for every metre increase in height (r2=0.7...Continue Reading

References

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Aug 13, 2008·Proceedings of the National Academy of Sciences of the United States of America·Jean-Christophe DomecKatherine A McCulloh

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Citations

May 1, 2012·Tree Physiology·Katherine A McCulloh, David R Woodruff
Feb 19, 2014·Tree Physiology·Rachael H NolanPatrick N J Lane
Dec 18, 2013·Tree Physiology·David R Woodruff
Jun 12, 2012·Plant Science : an International Journal of Experimental Plant Biology·Devendra K SoniPramod A Shirke
Aug 10, 2016·Proceedings of the National Academy of Sciences of the United States of America·Christina M RestainoJeremy Littell
Feb 7, 2019·American Journal of Botany·Alana R O Chin, Stephen C Sillett
Jul 15, 2017·Frontiers in Plant Science·Shah FahadJianliang Huang

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