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Effects of temperature on ethylene-induced phenylalanine ammonia lyase (PAL) activity and russet spotting in harvested iceberg lettuce.

Author(s) : RITENOUR M. A., AHRENS M. J., SALTVEIT M. E.

Type of article: Article

Summary

Tissue exposed to ethylene and held at 15 or 20 deg C showed earlier but lower peaks in PAL activity than tissue held at 5 deg C. Accumulation of total soluble phenolic compounds, and the development of russet spotting (RS) paralleled increases in PAL activity after a short lag period. Lettuce tissue transferred from 5 to 15 deg C after 1 to 3 days showed later but higher peaks in PAL activity than tissue continuously held at 15 deg C. Transferring ethylene-exposed tissue to 0 deg C before RS symptoms developed greatly limited further rise in PAL activity and RS development. Discontinuing ethylene exposure after 4 days resulted in a rapid decrease in PAL activity. Lettuce tissue exposed to ethylene for 4 days and then transferred from 5 to 0 deg C after the development of moderate RS symptoms showed no difference in RS after 8 days compared to tissue stored continuously at 5 deg C.

Details

  • Original title: Effects of temperature on ethylene-induced phenylalanine ammonia lyase (PAL) activity and russet spotting in harvested iceberg lettuce.
  • Record ID : 1996-2295
  • Languages: English
  • Source: J. am. Soc. hortic. Sci. - vol. 120 - n. 1
  • Publication date: 1995/01
  • Document available for consultation in the library of the IIR headquarters only.

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