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Published on December 1, 2006; 10.1104/pp.106.089383

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Received September 2, 2006
Accepted November 22, 2006

Helianthus Nighttime Conductance and Transpiration Respond to Soil Water but not Nutrient Availability

Ava R. Howard * and Lisa A. Donovan

Department of Plant Biology, 2502 Plant Sciences Building, University of Georgia, Athens, GA 30602-7271

* Corresponding author; email: ahoward{at}plantbio.uga.edu.

We investigated the response of Helianthus sp. nighttime conductance (gnight) and transpiration (Enight) to soil nutrient and water limitations in nine greenhouse studies. The studies primarily used wild Helianthus annuus L., but also included a commercial and early domesticate of H. annuus, and three additional wild species (H. petiolaris Nutt., H. deserticola Heiser, and H. anomalus Blake). Well watered plants of all species showed substantial gnight (0.023-0.225 mol m-2 s-1) and Enight (0.29-2.46 mmol m-2 s-1) measured as instantaneous gas exchange. Based on the potential for transpiration to increase mass flow of mobile nutrients to roots, we hypothesized that gnight and Enight would increase under limiting soil nutrients, but found no evidence of responses in all six studies testing this. Based on known daytime responses to water limitation, we hypothesized that gnight and Enight would decrease when soil water availability was limited, and results from all four studies testing this supported our hypothesis. We also established that stomatal conductance at night was on average five times greater than cuticular conductance. Additionally, gnight and Enight varied nocturnally and across plant reproductive stages while remaining relatively constant as leaves aged. Our results further the ability to predict conditions under which nighttime water loss will be biologically significant and demonstrate that for Helianthus, gnight can be regulated.




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