Physiological responses of black willow (Salix nigra) cuttings to a range of soil moisture regimes |
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Authors: | S. Li S. R. Pezeshki S. Goodwin F. D. Shields Jr. |
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Affiliation: | (1) Department of Biology, The University of Memphis, Memphis, TN 38152, USA;(2) W. Harry Feinstone Center for Genomic Research, The University of Memphis, Memphis, TN 38152, USA;(3) USDA-ARS National Sedimentation Laboratory, P.O. Box 1157, Oxford, Mississippi 38655, USA |
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Abstract: | We quantified the physiological responses of black willow to four soil moisture regimes: no flooding (control, C), continuous flooding (CF), periodic flooding (PF), and periodic drought (PD). Stomatal limitation was one of the factors that led to the reduced photosynthetic capacity in CF cuttings. Under PD, stomatal closure, decreased leaf chlorophyll content, and increased dark fluorescence yield contributed to photosynthetic decline. CF cuttings accumulated the lowest shoot biomass while the final height and root growth were most adversely affected by PD. PF cuttings tended to allocate more photoassimilates to root growth than to shoots.This revised version was published online in March 2005 with corrections to the page numbers. |
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Keywords: | chlorophyll a fluorescence drought flooding growth photosynthesis stomatal conductance |
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