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| Web URL(s): | https://wssa.net/wp-content/uploads/WSSA-WSWS-2023-Proceedings.html
Last checked: 08/15/2023
Notes: Item is within a single large file; Joint Weed Science Society of America and Northeastern Weed Science Society publication |
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| Publication Type:
| Report |
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| Content Type: | Abstract or summary only |
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| Author(s): | Pinnamaneni, Srinivasa Rao;
Reddy, Krishna N. |
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| Author Affiliation: | Crop Production Systems Research Unit USDA-ARS, Stoneville, MS |
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| Title: | Elevatex CO2 and temperature effects on growth and photosynthetic responses in purple and yellow nutsedge (Cyperus rotundus L. and C. esculentus L.) |
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| Section: | Poster - 08. Weed biology and ecology
Other records with the "Poster - 08. Weed biology and ecology" Section
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| Meeting Info.: | Arlington, Virginia: January 30 - February 2, 2023 |
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| Source: | Abstracts of the Annual Meeting of the Weed Science Society of America. 2023, p. 115. |
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| Publishing Information: | [United States]: Weed Science Society of America |
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| # of Pages: | 1 |
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| Related Web URL: | https://wssa.net/wp-content/uploads/2023-Program-Schedule_Detail_Updated-1.pdf#page=35
Last checked: 08/15/2023
Notes: Meeting program |
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| Abstract/Contents: | "Global atmospheric carbon dioxide (CO2 ) and air temperatures are steadily rising and likely to have profound effects on biology of weed species. Growth chamber experiments were conductedin 2022 to determine effects of elevated CO2 and temperatures on growth and photosynthetic responses in two invasive weeds, purple nutsedge (Cyperus rotundus L.) and yellow nutsedge (C. esculentus L.). Plants were grown in pots, irrigated, fertilized as needed. In one experiment, plants were subjected to five day/night temperatures of 20/12, 25/17, 30/22, 35/27, and 40/32 °C from 3-day old propagules to until harvest. In another experiment, plants were subjected to three CO2 levels of 420, 570, and 720 ppm at two day/night temperatures of 30/22 and 35/27 °C to assess CO2 and temperature interactions. A randomized complete block design with 5 to 6 replications was used and the experiments were repeated. Purple and yellow nutsedge shoot biomass was harvested after 5 and 7 weeks of growth, respectively. After clipping one set of both species were allowed to regrow for two weeks and shoot biomass recorded. Data on shoot number, plant height, shoot biomass, root biomass, regrowth shoot number, regrowth shoot height, regrowth shoot biomass, regrowth root biomass, chlorophyll index, stomatal conductance, net photosynthesis rate, transpiration rate, and instantaneous water use efficiencywere collected. A temperature regime of 30/22 °C appears to be optimum for both species and purple nutsedge was more impacted by the temperature deviation on either side of the 30/22 °C for shoot production, shoot biomass, and root biomass in the first and regrowth harvests. The net photosynthetic rate, transpiration rate, and stomatal conductance declined with either increase or decrease in temperatures. Both species recorded significantly higher shoot number, shoot height, shoot and root biomass at elevated CO2 levels. The species differences were conspicuous as yellow nutsedge recorded higher shoot number, shoot biomass, root biomass, and regrowth root biomass than purple nutsedge by 59%, 103%, 59% and 23%, respectively. The species differences were insignificant for shoot height, regrowth shoot number and regrowth shoot biomass. The temperature and CO2 interactions were significant for most of the traits. Theflowering appeared to be compromised at elevated CO2 levels in both species and yellow nutsedge did not flower even after 10 weeks of growth. The net photosynthetic rate andchlorophyll index did not differ among CO2 treatments in purple or yellow nutsedge. Whereas, stomatal conductance, transpiration rate decreased with increased CO2 levels and internal CO2 concentration and intrinsic water use efficiency increased with increased CO2 levels. This study demonstrated that elevated CO2 levels had a profound positive effect on growth, while temperatures higher or lower than 30/22 °C had a negative effect on growth of both species." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only!
Proceedings of joint 63rd meeting held by Weed Science Society of America (WSSA) and Northeastern Weed Science Society (NEWSS) |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Pinnamaneni, S. R., and K. N. Reddy. 2023. Elevatex CO2 and temperature effects on growth and photosynthetic responses in purple and yellow nutsedge (Cyperus rotundus L. and C. esculentus L.). Abstr. Annu. Meet. Weed Sci. Soc. Am. p. 115. |
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| Web URL(s):
https://wssa.net/wp-content/uploads/WSSA-WSWS-2023-Proceedings.html
Last checked: 08/15/2023
Notes: Item is within a single large file; Joint Weed Science Society of America and Northeastern Weed Science Society publication |
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MSU catalog number: b2180085 |
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