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Article

Water-Use Efficiency Declines during Autumn Leaf Senescence in Three Deciduous Tree Species

by
Adriana Sanchez
1,*,
Nicole M. Hughes
2 and
William K. Smith
1
1
Department of Biology, Wake Forest University, Winston-Salem, NC 27109, USA
2
Department of Biology, High Point University, High Point, NC 27268, USA
*
Author to whom correspondence should be addressed.
Int. J. Plant Biol. 2013, 4(1), e7; https://doi.org/10.4081/pb.2013.e7
Submission received: 3 September 2012 / Revised: 25 May 2013 / Accepted: 5 June 2013 / Published: 10 September 2013

Abstract

During fall leaf senescence in deciduous species, photosynthesis nears completion due to chlorophyll breakdown and re-assimilation. However, several other processes such as leaf nutrient uptake, re-translocation, and storage, or tissue dehydration to avoid frost damage, may be important and dependent upon stomatal opening. We report here on measured changes in photosynthesis (A), leaf conductance to water vapor (g), and WUE (estimated by A/g) in three deciduous tree species (Acer saccharum, Cornus florida, and Ginkgo biloba) during the weeks of leaf senescence preceding abscission. Substantial decreases in A of 60 up to 80% were not matched quantitatively by similar declines in g (40 to 70%), resulting in corresponding decreases in WUE (estimated by A/g) from near 50% to over 300% among the three species. This shift to a lower WUE may reflect adaptive value in maintaining a higher g relative to A during the fall leaf senescence period.
Keywords: fall leaf senescence; leaf conductance; photosynthesis; water use efficiency fall leaf senescence; leaf conductance; photosynthesis; water use efficiency

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MDPI and ACS Style

Sanchez, A.; Hughes, N.M.; Smith, W.K. Water-Use Efficiency Declines during Autumn Leaf Senescence in Three Deciduous Tree Species. Int. J. Plant Biol. 2013, 4, e7. https://doi.org/10.4081/pb.2013.e7

AMA Style

Sanchez A, Hughes NM, Smith WK. Water-Use Efficiency Declines during Autumn Leaf Senescence in Three Deciduous Tree Species. International Journal of Plant Biology. 2013; 4(1):e7. https://doi.org/10.4081/pb.2013.e7

Chicago/Turabian Style

Sanchez, Adriana, Nicole M. Hughes, and William K. Smith. 2013. "Water-Use Efficiency Declines during Autumn Leaf Senescence in Three Deciduous Tree Species" International Journal of Plant Biology 4, no. 1: e7. https://doi.org/10.4081/pb.2013.e7

APA Style

Sanchez, A., Hughes, N. M., & Smith, W. K. (2013). Water-Use Efficiency Declines during Autumn Leaf Senescence in Three Deciduous Tree Species. International Journal of Plant Biology, 4(1), e7. https://doi.org/10.4081/pb.2013.e7

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