Scion-rootstock interaction affects the phytochemical composition of Prunus phloem.

摘要

The focus of our investigation was the influence of various rootstocks for peach of different genetic origin on phytochemical composition in the phloem above and below the graft union, and the role of phenols in graft compatibility/incompatibility. Assays of phloem with cambium from 6-year-old 'Royal Glory' peach trees, grafted on rootstocks of various genetic origin, peach seedling ( Prunus persica L.), GF 677 and Monegro (both hybrids of Prunus persica L. * Prunus amygdalus L.), Cadaman and Barrier (both hybrids of Prunus persica L. * Prunus davidiana L.), and Penta and Tetra (both belonging to Prunus domestica L.) were analysed with HPLC-MS. Twenty-one phenolics were detected in the phloem of Prunus persica and their hybrid rootstocks, and 10 phenolics in Prunus domestica rootstocks. The most abundant phenolic group in the phloem of Prunus persica and Prunus domestica rootstocks was the flavanols. 'Royal Glory' is highly compatible with peach seedling, GF 677 and Monegro rootstocks. In Cadaman rootstock, accumulation of all flavonols, and in Barrier, the flavonols quercetin 3-glucoside and isorhamnetin 3-glucoside, and the flavanone prunin were observed above the graft union, which is related to graft incompatibility. Hydoxycinnamic acids, unknownphenols as well as two dimeric procyanidins were present only in plum rootstocks. The level of all analysed flavonols, flavanone naringenin hexoside, and flavanols (except catechin, epicatechin and procyanidin B1) were significantly higher above the graft union in Prunus domestica rootstocks, which indicates that flavonols could also be involved in the graft incompatibility process.