Red walnut: Characterization of the phenolic profiles, and activity and gene expression of selected enzymes related to the phenylpropanoid pathway in pellicle during walnut development.

07:00 EST 1st March 2018 | BioPortfolio

Summary of "Red walnut: Characterization of the phenolic profiles, and activity and gene expression of selected enzymes related to the phenylpropanoid pathway in pellicle during walnut development."

A rare variant of walnut with a red seed coat (pellicle) was examined for alterations in the phenolic profiles during development. The red walnut (RW) pellicle was compared to two commonly-colored walnut varieties; 'Lara' (brown) and 'Fernor' (light brown). Furthermore, the activity of selected enzymes of the phenylpropanoid and flavonoid related pathways and the relative expression of phenylalanine ammonia lyase (PAL) and anthocyanidin synthase (ANS) structural genes were examined in the pellicles of the three varieties. In the pellicle of RW, phenylalanine ammonia lyase (PAL) activity and the related PAL expression was most pronounced in August, about one month before commercial maturity, suggesting a high synthesis rate of phenolic compounds at this development stage. The most pronounced differences between the red and the light/dark brown varieties were the increased activity/gene expression of PAL and the increased anthocyanidin synthase (ANS) expression of RW in August. The vibrant color of the RW pellicle is based on the presence of four derivatives of cyanidin and delphinidin-hexosides.


Journal Details

This article was published in the following journal.

Name: Journal of agricultural and food chemistry
ISSN: 1520-5118


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