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| Publication Type:
| Refereed |
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| Author(s): | Hodges, Clinton F. |
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| Author Affiliation: | Department of Horticulture, Iowa State University |
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| Title: | Endogenous ethylene response and chlorophyll loss in sequentially older leaves of Poa pratensis infected by Bipolaris sorokiniana |
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| Source: | Plant Physiology. Vol. 136, 1990, p. 670-674. |
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| Publishing Information: | Lancaster, PA: American Society of Plant Physiologists |
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| # of Pages: | 5 |
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| Keywords: | TIC Keywords: Senescence; Ethylene; Chlorophyll; Poa pratensis; Bipolaris sorokiniana
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| Abstract/Contents: | "Endogenous ethylene production in sequentially older leaves of intact Poa pratensis infected by Bipolaris sorokiniana was evaluated as a factor in pathogenesis contributing to the chlorosis of infected leaves. Ethylene increased in leaves of all ages in response to infection, peaked 48 h after inoculation, and then gradually declined through 96 h. Maximum ethylene production occurred in the youngest leaf and decreased progressively in each older leaf. Symptom development on sequentially older leaves included brown lesions, chlorotic halos around lesions, chlorosis along and on either side of the leaf midvein between lesions, and complete chlorosis of infected leaves. Severity of symptom development and Chl loss increased on each sequentially older leaf. Subjecting inoculated sequentially older leaves of intact plants to hypobaric pressure (23.3 kPa) in a controlled atmosphere-environmental system (CAES), or to 150 [mu]L L-1 2,5-norbornadiene (NBD), during infection and disease development decreased the loss of Chl in all leaves without interfering with infection and lesion development. Midvein and complete chlorosis common to the two oldest infected leaves was substantially decreased. Chlorotic halos around lesions were not appreciably affected by hypobaric pressure or by NBD. It was concluded that ethylene is a component of pathogenesis responsible for much of the chlorosis of infected leaves, that pathogenesis is enhanced in sequentially older leaves, and that chlorotic halos surrounding lesions are not a function of ethylene." |
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| Language: | English |
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| References: | 27 |
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| Note: | Pictures, b/w
Figures |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hodges, C. F. 1990. Endogenous ethylene response and chlorophyll loss in sequentially older leaves of Poa pratensis infected by Bipolaris sorokiniana. Plant Physiol. 136:p. 670-674. |
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