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| DOI: | 10.1016/S0098-8472(02)00042-4 |
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| Web URL(s): | http://www.sciencedirect.com/science/article/pii/S0098847202000424
Last checked: 01/31/2014
Access conditions: Item is within a limited-access website |
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| Author(s): | Morse, L. J.;
Day, T. A.;
Faeth, S. H. |
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| Author Affiliation: | Morse and Day: Department of Plant Biology, Arizona State University, Tempe, Arizona; Faeth: Department of Biology, Arizona State University, Tempe, Arizona |
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| Title: | Effect of Neotyphodium endophyte infection on growth and leaf gas exchange of Arizona fescue under contrasting water availability regimes |
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| Source: | Environmental and Experimental Botany. Vol. 48, No. 3, December 2002, p. 257-268. |
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| Publishing Information: | Elsevier |
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| # of Pages: | 12 |
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| Keywords: | TIC Keywords: Festuca arizonica; Growth rate; Biomass; Water availability; Photosynthesis; Water potential; Fungus infection; Endophytes; Neotyphodium
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| Abstract/Contents: | "We assessed how Neotyphodium infection influenced the biomass production and growth of Arizona Fescue (Festuca arizonica Vasey), a dominant understory grass in Ponderosa pine (Pinus ponderosa) forests of the southwest USA, by growing potted infected (E+) and uninfected (E-) plants under a high and a low water availability regime for 87 days. We measured growth analysis parameters, leaf net photosynthesis (Pn), chlorophyll fluorescence parameters, conductance to water vapor (g1) and water potential (Ψ), to provide explanations for differences in biomass production under these treatments. Under high water availability, E- plants produced more biomass and had greater relative growth rates (RGR; rate of biomass gain per biomass); higher RGR of E- plants was correlated with higher Pn as well as production of less dense, presumably thinner leaves, which provided more leaf area per leaf biomass, and greater LAR (leaf area ratio; leaf area per total plant biomass). Under low water availability, E+ plants produced more aboveground biomass and had greater RGR; higher RGR of E+ plants was correlated with higher net assimilation rates,as well as production of less dense leaves and greater LAR. Infected plants tended to have lower midday Pn and g1 in both water availability regimes. Lower Pn in E+ plants appeared primarily due to stomatal, rather than biochemical, limitations to photosynthesis. When a more severe water stress was imposed in the low water availability treatment over the last 61 days of the experiment, E+ plants tended to have higher midday Pn and g1. Infected plants also tended to have less negative leaf Ψ regardless of water availability regime. Lower g1 and transpirational losses of E+ plants probably conserved soil moisture, such that when a more severe water stress was subsequently imposed, higher soil moisture availability allowed E+ plants to maintain higher Pn and g1. Neotyphodium infection appears beneficial to Arizona fescue performance uner low water availability and detrimental under ample water availability." |
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| Language: | English |
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| References: | 48 |
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| Note: | Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Morse, L. J., T. A. Day, and S. H. Faeth. 2002. Effect of Neotyphodium endophyte infection on growth and leaf gas exchange of Arizona fescue under contrasting water availability regimes. Environmental and Experimental Botany. 48(3):p. 257-268. |
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| DOI: 10.1016/S0098-8472(02)00042-4 |
| Web URL(s):
http://www.sciencedirect.com/science/article/pii/S0098847202000424
Last checked: 01/31/2014
Access conditions: Item is within a limited-access website |
| 
MSU catalog number: QK 711 .A1 R3 |
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