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| DOI: | 10.1016/j.envexpbot.2008.12.002 |
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| Web URL(s): | http://www.sciencedirect.com/science/article/pii/S009884720800155X
Last checked: 02/07/2014
Access conditions: Item is within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | Swarthout, Debbie;
Harper, Emily;
Judd, Stephanie;
Gonthier, David;
Shyne, Rebekah;
Stowe, Timothy;
Bultman, Thomas |
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| Author Affiliation: | Biology Department, Hope College, Holland, Michigan |
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| Title: | Measures of leaf-level water-use efficiency in drought stressed endophyte infected and non-infected tall fescue grasses |
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| Source: | Environmental and Experimental Botany. Vol. 66, No. 1, April 2009, p. 88-93. |
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| Publishing Information: | Elsevier |
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| # of Pages: | 6 |
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| Keywords: | TIC Keywords: Water use; Drought stress; Endophytes; Festuca arundinacea; Comparisons; Fungi; Stomatal conductance; Photosynthesis; Water availability; Transpiration
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| Abstract/Contents: | "Neotyphodium coenophialum [Morgan-Jones and Gams], grows in the above-ground parts of tall fescue [Lolium arundinaceum (Schreb.) Darbysh.]. It is an asexual fungus that is transmitted through seed of its host plant. This grass/endophyte association is enhanced by the protection of the host from herbivory and improved drought stress. We investigated how a decline in leaf-level stomatal conductance impacts the instantaneous water-use efficiency (WUE), in endophyte-infected (E+) versus non-infected (E-) Kentucky-31 tall fescue grasses grown in a controlled environmental chamber over a 10-week period. Grasses were cut at 6 weeks after germination and allowed to regrow under high and low soil moisture availability. One week after cutting, soil moisture was allowed to decline in the low water treatment for 2 weeks until severe stress was demonstrated through a decline in stomatal conductance to less than 100 mmol m-2 s-1. We found no differences in WUE between E+ and E- plants when water was not limiting while higher WUE was exhibited in E+ plants relative to E- plants under severe drought stress. The E- plants showed an 18-fold reduction in mean WUE and a 70-fold reduction in photosynthesis under drought stress, while there was no change in WUE and only a fourfold decline in photosynthesis between well-watered and drought stressed E+ plants at 21 days. While there were no differences in the rates of transpiration between E+ and E- plants under severe drought stress, differences in WUE can be attributed mainly to higher photosynthetic rates of E+ than E- plants. The difference in photosynthetic rates between E+ and E- plants under drought conditions could not be explained by differences in stomatal conductance and Rubisco (EC 4.1.1.39) activities." |
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| Language: | English |
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| References: | 42 |
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| See Also: | Other items relating to: Disasters - Drought |
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| Note: | Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Swarthout, D., E. Harper, S. Judd, D. Gonthier, R. Shyne, T. Stowe, et al. 2009. Measures of leaf-level water-use efficiency in drought stressed endophyte infected and non-infected tall fescue grasses. Environ. Exp. Bot. 66(1):p. 88-93. |
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| DOI: 10.1016/j.envexpbot.2008.12.002 |
| Web URL(s):
http://www.sciencedirect.com/science/article/pii/S009884720800155X
Last checked: 02/07/2014
Access conditions: Item is within a limited-access website |
| 
MSU catalog number: QK 711 .A1 R3 |
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