Effects of gibberellic acid (GA3) on strawberry PAL (phenylalanine ammonia-lyase) and TAL (tyrosine ammonia-lyase) enzyme activities
✍ Scribed by Montero, Teresa; Mollá, Esperanza; Martín-Cabrejas, Maria A; López-Andréu, Francisco J
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 192 KB
- Volume
- 77
- Category
- Article
- ISSN
- 0022-5142
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✦ Synopsis
Gibberellic acid treatments (30 and 60 lg litre~1) were applied (GA 3 ) to young plants (Fragaria ananassa cv Chandler). Fruits were harvested at various developmental stages (14, 21, 28 and 35 days from fruit set). Weight and size, phenolic compounds (total polyphenols and anthocyanins) and enzyme activities, phenylalanine ammonia-lyase (PAL) and tyrosine ammonia-lyase (TAL) were determined. Our aim was to obtain detailed information about PAL and TAL activities related to the strawberry colour during development and ripening processes and to determine the e †ects of exogenous treatments of GA 3 on PAL and TAL activities. Exogenous treatments of improve weight, size GA 3 and colour of strawberry fruits, and a †ect PAL and TAL activities. We found that the anthocyanin content and PAL activity are enhanced by the exogenous treatment of in the range of 30 lg litre~1. However, with the higher GA 3 GA 3 treatment, only the anthocyanin content is a †ected in that way. These Ðndings suggest that gibberellic acid e †ect on PAL, TAL and ultimately anthocyanin enhancement is dosage related and saturation of the response occurs at 30 lg litre~1.