Abstract
The enzyme activity of polyphenol oxidase (PPO) for Japanese processing potatoes, Toyoshiro (bruise-resistant variety) and Norin No.1 (susceptible one), was measured at different pHs or substrates to investigate pH or substrate-specificity dependence.The pH-optimum of Toyoshiro PPO was pH 6.2-6.6,whereas that of Norin No.1 was 5.4.In addition, the PPO activity level of Norin No.1 was approximately 6 times higher (p 0.01) than that of Toyoshiro, when the specific activities were determined by using tyrosine as a substrate.This result implies that less tyrosine content of potatoes could reduce blackspot bruise.This information may be useful for breeders in developing new blackspot-bruise-resistant varieties.
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Claims 4
Claim · model-written summary
Toyoshiro PPO had a pH optimum of 6.2-6.6.
Verbatim
e0“The pH-optimum of Toyoshiro PPO was pH 6.2-6.6,whereas that of Norin No.1 was 5.4.”
t0“Japanese processing potatoes”
Claim · model-written summary
Norin No.1 PPO had a pH optimum of 5.4.
Verbatim
e0“The pH-optimum of Toyoshiro PPO was pH 6.2-6.6,whereas that of Norin No.1 was 5.4.”
t0“Japanese processing potatoes”
Claim · model-written summary
Norin No.1 PPO activity with tyrosine was approximately six times higher than Toyoshiro PPO activity.
Verbatim
e0“the PPO activity level of Norin No.1 was approximately 6 times higher (p 0.01) than that of Toyoshiro, when the specific activities were determined by using tyrosine as a substrate”
t0“Japanese processing potatoes”
Claim · model-written summary
The authors suggest that lower potato tyrosine content could reduce blackspot bruise.
- Taxon
- potatoes
Solanum tuberosume0 - Compound
- tyrosinee0
- Outcome
- blackspot bruisee0
- Qualifier
- less tyrosine contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“less tyrosine content of potatoes could reduce blackspot bruise”