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Web URL(s): | https://scisoc.confex.com/scisoc/2018am/meetingapp.cgi/Paper/112578 Last checked: 11/12/2018 |
Publication Type:
| Report |
Content Type: | Abstract or Summary only |
Author(s): | Katuwal, Krishna;
Schwartz, Brian M.;
Jespersen, David |
Author Affiliation: | Katuwal: University of Georgia-Griffin, Griffin, GA; Schwartz: Department of Crop and Soil Sciences, University of Georgia - Tifton, Tifton, GA; Jespersen: University of Georgia, Griffin, GA |
Title: | Physiological mechanisms for developing improved drought tolerance in bermudagrasses |
Section: | C05 turfgrass science Other records with the "C05 turfgrass science" Section
Turf environmental science, rhizosphere ecology, and water oral Other records with the "Turf environmental science, rhizosphere ecology, and water oral" Section
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Meeting Info.: | Baltimore, Maryland: November 4-7, 2018 |
Source: | ASA, CSSA and SSSA International Annual Meetings. 2018, p. 112578. |
Publishing Information: | [Madison, Wisconsin]: [American Society of Agronomy, Crop Science Society of America, and Canadian Society of Agronomy] |
# of Pages: | 1 |
Keywords: | TIC Keywords: Cultivar evaluation; Cultivar improvement; Cynodon dactylon; Drought resistance; Normalized Difference Vegetation Index
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Abstract/Contents: | "Drought is a major abiotic stress, and understanding drought tolerance is crucial for the development of improved cultivars and increased sustainability of turf areas. The objective of this study is to better understand the physiological mechanisms responsible for elevated drought tolerance in bermudagrasses. A total of six genetically diverse lines including three commercial cultivars ('TifTuf', 'Tifway' and 'Celebration') and three experimental lines (UGB-42, UGB-70 and UGB-208) were subjected to drought conditions to better understand differences in physiological responses between lines. Experiments were performed under both controlled environment conditions as well as field conditions to assess drought responses and mechanisms responsible for differences in drought performance. Differences in drought performance were assessed through measuring relative water content, photosynthetic rate, membrane stability, osmotic adjustment, and canopy color. Field studies were conducted with an automatic rainout shelter at the University of Georgia Griffin campus. In 2017 drought was induced by withholding irrigation for 7 weeks under field conditions. All lines experienced drought related damages but significant differences in drought responses were found between lines. After five weeks of drought, 'TifTuf' maintained the highest relative water content of 78% followed by 71, 67, 65, 64 and 63% in UGB-42, UGB-70, 'Tifway', UGB-208 and 'Celebration', respectively. Similar trends were observed in membrane stability measurements with UGB-42 and TifTuf having less membrane damage of 22 and 23% compared to 29, 32 and 33% in UGB-208, 'Tifway' and 'Celebration', respectively. Top performing line 'TifTuf' consistently maintained higher photosynthetic levels and canopy color assessed by NDVI compared to other lines. Although some experimental lines such as UGB-42 maintained membrane stability, water content and canopy color, significant reductions in its photosynthetic rates compared to other lines indicates multiple physiological processes responsible for drought tolerance in bermudagrasses." |
Language: | English |
References: | 0 |
Note: | This item is an abstract only! "50-4" |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Katuwal, K., B. M. Schwartz, and D. Jespersen. 2018. Physiological mechanisms for developing improved drought tolerance in bermudagrasses. Agron. Abr. p. 112578. |
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