The phenolic content and its involvement in the graft incompatibility process of various pear rootstocks (Pyrus communis L.).

Abstract:

:This study investigates the influence of various rootstocks for pear on the phytochemical composition in the phloem above and below the graft union and the role of phenols in pear graft incompatibility. Assays of phloem with cambium from 4-year-old 'Conference', 'Abate Fetel' and 'Williams' pear trees grafted on different rootstocks: Quince MA, Quince BA 29, Fox 11, Farold 40 (Daygon), seedling Pyrus communis L. and own rooted (P. communis L.) were analyzed with HPLC-MS. The most abundant phenolic compound in phloem above and below the graft union was arbutin, followed by procyanidin B1 and chlorogenic acid. In 'Conference' and 'Abate Fetel', higher arbutin content levels were measured above the graft union, while in the incompatible scion of 'Williams' on quince MA higher arbutin content levels were measured below the graft union. In all three observed cultivars (in 'Conference' the difference was not significant) grafted on Fox 11 rootstock, the highest content of arbutin was measured below the graft union. The results indicate that not only catechin and procyanidin B1, but also arbutin and several flavonols could be involved in graft incompatibility. All cultivars grafted on quince rootstocks had higher levels of epicatechin and procyanidin B2 below the graft union, even though some differences were not significant. It seems that those phenols do not affect pear incompatibility. A severe incompatibility between Fox 11 rootstock and 'Williams' was detected.

journal_name

J Plant Physiol

authors

Hudina M,Orazem P,Jakopic J,Stampar F

doi

10.1016/j.jplph.2013.10.022

subject

Has Abstract

pub_date

2014-03-01 00:00:00

pages

76-84

issue

5

eissn

0176-1617

issn

1618-1328

pii

S0176-1617(13)00458-6

journal_volume

171

pub_type

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