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Studies on the factor responsible for reddish coloration of mechanically injured tissue and tissue infected by fungus, Stagonospora curtisii (Berk.) Sacc. in Hippeastrum × hybr. hort.

Alicja Saniewska, Marian Saniewski

Research Institute of Pomology and Floriculture
Pomologiczna 18, 96-100 Skierniewice, Poland

It was found that the reddish coloration in the mechanically injured tissue of different organs of Hippeastrum × hybr. hort. or in that infected by Stagonospora curtisii (Berk.) Sacc., is caused by the same compound which, however, differed from anthocyanins. The maximum absorption spectrum of the compound extracted with methanol/HCl (99:1, v/v) is 476 nm, but the maximum absorption spectrum of anthocyanin present in the red perianth of the cultivar Red Lion is 429 and 516 nm. The formation of red pigment is most propably related to the development of polyphenol oxidase activity caused by mechanical injury or by fungal infection.

Saniewska A., Saniewski M., 1992. Studies on the factor responsible for reddish coloration of mechanically injured tissue and tissue infected by fungus, Stagonospora curtisii (Berk.) Sacc. in Hippeastrum × hybr. hort. Folia Horticulturae IV/1: 3-9.