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| Web URL(s): | http://crops.confex.com/crops/2005am/techprogram/P5593.HTM
Last checked: 01/31/2006 |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Xu, Yan;
Huang, Bingru |
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| Author Affiliation: | Rutgers University |
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| Title: | Hormonal changes related with leaf senescence under heat stress for Agrostis species |
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| Section: | Graduate student oral competition: Breeding, fertility, environment, and management
Other records with the "Graduate student oral competition: Breeding, fertility, environment, and management" Section
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| Meeting Info.: | Salt Lake City, UT: 7-10 November, 2005 |
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| Source: | 2005 Annual Meeting Abstracts [ASA/CSSA/SSSA/CSSS]. 2005, p. [1]. |
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| Publishing Information: | [Madison, WI]: American Society of Agronomy, Crop Science Society of America, Soil Science Society of America |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Temperatures; Growth regulators; Leaves; Senescence; Heat Stress; Agrostis; Heat injury; Turfgrass quality; Growth; Cytokinins; Abscisic acid; Ethylene; Heat resistance
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| Cultivar Names: | Penncross |
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| Abstract/Contents: | "Leaf senescence is a typical symptom of heat injury in cool-season grasses during summer, which affects their overall turf quality and growth. Some phytohormones may regulate the timing and severity of senescence. The objectives of this project are to examine the changes of three major senescence-related phytohormones (cytokinins, ABA and ethylene) under heat stress in two Agrostis species that differ in their heat tolerance, and to determine the relationship between hormonal changes and heat-induced leaf senescence. The plants of heat tolerant A. scabra and heat sensitive 'Penncross', a cultivar of A. stolonifera, were exposed to the optimum temperature of 20°C and superaoptimal temperature of 35°C for 5 weeks. The amount of cytokinins, IPA and ZR, declined in both species, but the decrease in A.scabra was less than that in 'Penncross'. On the other hand, ABA and ethylene contents increased in both species exposed to high temperature. However, while the increases in 'Penncross' started from the beginning, the increase of ABA and ethylene in A.scabra was postponed for two and three weeks, respectively. Besides, A. scabra exhibited slower decrease in its turf quality, photopigment contents, and chlorophyll fluorescence, as well as a slower growth rate. Our results suggest that the better tolerance of A.scabra to high temperature could be due to its ability to maintain normal metabolism of hormones for a longer time, which could be involved in delaying leaf senescence." |
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| Language: | English |
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| References: | 0 |
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| See Also: | Other items relating to: Biostimulants |
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| Note: | This item is an abstract only |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Huang, B., and Y. Xu. 2005. Hormonal changes related with leaf senescence under heat stress for Agrostis species. Annu. Meet. Abstr. p. [1]. |
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Last checked: 01/31/2006 |
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