COMPOSITIONAL CHANGE IN COLLETOTRICHUM (ANTHRACNOSE) INFECTED STRAWBERRY FRUIT

Differences in chemical composition in the fruit of different strawberry selections with various susceptibilities to Collectrotrichum were determined.
Tissues from both healthy and anthracnose infected strawberries were also analyzed for their differences in chemical composition.
Fruit tissue from resistant genotypes contained more soluble solids content (SSC), titratable acid (TA), sucrose, total sugar (TS) and ascorbic acid and ratios of SSC/TA and TS/TA than those from susceptible fruits.
Putrescine, spermidine and spermine were major polyamines in strawberry fruit and were higher in the fruit of resistant genotypes as compared with the susceptible genotypes.
Anthracnose infected fruit tissue had lower TA, but higher SSC, and SSC/TA ratio than healthy fruit tissue.
Fructose, glucose, total sugar and ratio of TS to TA were found to be higher whereas sucrose was lower in anthracnose infected fruit tissue compared to healthy tissue.
Ascorbic acid and organic acids (malic acid and citric acid) were also lower in infected tissue.
Fruit infected with anthracnose contained elevated spermidine and decreased putrescine content.
Infected fruit also produced an additional polyamine, diaminopropane.

III International Strawberry Symposium

S.Y. Wang, G.J. Galletta

Fragaria x ananassa, disease, sugars, acids, polyamines

https://doi.org/10.17660/ActaHortic.1997.439.135