Abstract
Pepper (Capsicum annuum L. `Early Calwonder') and corn (Zea mays L. `Jubilee') leaf disks exposed to high temperature stress produced ethylene, ethane, methanol, acetaldehyde, and ethanol based on comparison of retention times during gas chromatography to authentic standards. Methanol, ethanol, and acetaldehyde were also identified by mass spectroscopy. Corn leaf disks produced lower levels of ethylene, ethane and methanol, but more acetaldehyde and ethanol than pepper. Production of ethane, a by-product of lipid peroxidation, coincided with an increase in electrolyte leakage (EL) in pepper but not in corn. Compared with controls, pepper leaf disks infiltrated with linolenic acid evolved significantly greater amounts of ethane, acetaldehyde and methanol, and similar levels of ethanol. Introduction of linoleic acid did not significantly affect volatile hydrocarbon production in pepper. Electrolyte leakage and volatile hydrocarbon production were not affected by fatty acid infiltration in corn.
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