植物生理学-3.pptxEffects of Methanol on
Plant Respiration
组员:姜镇忠洪志婷贾浩然
夏春雨顿珠曲卓
草业141
目录
甲醇对植物的呼吸
作用的影响
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Introduction
Procedures
Results
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Introduction
Procedures
Results
This study examined the effects of methanol on respiration in tissues of pepper (Capsicum annuum), tomato (Lycopersicon esculentum), and petunia (Petunia hybrida) as measured by metabolic heat rates. Metabolic heat rate increased on brief exposure to aqueous solutions containing less than toxic concentrations of methanol. The heat rate increase correlated with methanol concentration.
Simultaneous measurement of metabolic heat, C02, and O2 rates of bell pepper leaf tissue suggested that exposure to methanol resulted in an increased carbon conversion efficiency.
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Introduction
Procedures
Results
Exposure of a single leaf to methanol resulted in a systemic response throughout the plant within a few hours. The methanol-induced increase in metabolic rate in whole plants lasted for several weeks. Brief exposures to methanol concentrations >=30% were toxic to leaf tissue as shown by greatly decreased metabolic rates and waterlogged appearance. Root tissue was more sensitive than leaf tissue, showing toxicity when briefly exposed to 10% methanol solution.
The increased metabolic rate and efficiency may explain previous reports of increased productivity seen in some field studies. plexity of the exposure-respiratory response relationship and differing tissue sensitivities found in this study probably explains the inability of others to reproduce the field responses originally reported.
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Introduction
Procedures
results
This study was designed to provide partial answers to six questions:
Dose exposure to methanol at the concertrations used in the field studies change respiration rate?
How dose the effect vary with the method of application?
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What is the time course of
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