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| Web URL(s): | http://archive.lib.msu.edu/tic/rpr/1992/Environmental/27776, Iowa State, Hodges.PDF
Last checked: 11/21/2013
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Material Type: | Manuscript |
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| Monographic Author(s): | Hodges, Clinton F. |
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| Author Affiliation: | Principal Investigator, Dept. of Horticulture, Iowa State Univ. |
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| Monograph Title: | Potential for Physiological Management of Symptom Expression By Turfgrasses Infected By Bipolaris sorokiniana: [1992 Final Research Report], 1992. |
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| Publishing Information: | [Ames, Iowa]: Iowa State University |
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| # of Pages: | 5 |
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| Collation: | 5 pp. |
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| Abstract/Contents: | "Endogenous ethylene is generated in the leaves of Poa pratensis in response to infection by Bipolaris sorokiniana and the ethylene contributes substantially to the loss of chlorophyll from the infected leaves. This research project was initiated to determine if the endogenous ethylene, or its mode action, can be manipulated to prevent the loss of chlorophyll in infected leaves and prevent yellowing. Prevention of ethylene induced yellowing could result in the control of symptom expression, specifically yellowing of infected turf, independent of the infection. This could reduce use of fungicides and provide a new approach to disease management. Research conducted in the last year has concentrated on decreasing ethylene in infected leaves by applying ethylene inhibiting substances to roots of inoculated plants. The following materials have been evaluated for their effectiveness when applied to the soil. 1. Aminooxyacetic Acid (AOA); 2. Aminoisobutyric Acid (AIBA); 3. Benzoic Acid (BNZ); 4. Canaline (CAN); 5. Carbonyl Cyanide m-Chlorophyenylhydrazone (CCCP); 6. Cobalt Chloride (COCL); 7. Propyl Gallate (PGA); Endogenous ethylene in healthy leaves ranged from 276 to 321 μ1 1-1. Endogenous ethylene of inoculated leaves increases by 24h, peaked at 48h (1476 μ1 1-1), and then declined at 72h and 96h. CAN, AOA, CCCP, and PGA applied to roots reduced leaf ethylene in response to infection. Of the materials that decreased ethylene, only CAN and AOA prevented substantial loss of chlorophyll. Inoculated leaves of plants treated with CAN and AOA retained 74% and 80% of their Chlorophyll, respectively. Preliminary results from leaf treatments with CAN and AOA show a greater decrease in the surge of endogenous ethylene associated with infection than that achieved with soil treatment. Ethylene levels have averaged 30% of that in inoculated controls with as much as a 91% retention of chlorophyll. These observations suggest that manipulation of symptom expression in this host-pathogen interaction (and perhaps others) is feasible. Our 1993, studies will concentrate on the function and control of senescence processes during pathogenesis." |
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| Language: | English |
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| References: | 0 |
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| See Also: | See also related summary article "Potential for physiological management of symptom expression by turfgrass infected by Bipolaris sorokiniana" 1992 Environmental Research Summary [USGA], 1992, p. 17, R=27776. R=27776 |
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| Note: | Also appears as pp. 00223-00228 in the USGA Turfgrass Research Committee Reporting Binders for 1992.
"Climatic Region: Cool Humid"
"USGA Region: Great Lakes"
"Final Report: 1992"
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
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| Web URL(s):
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Last checked: 11/21/2013
Requires: PDF Reader |
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