Stilbenes in the different organs of &lt;em&gt;Vitis vinifera&lt;/em&gt; cv. Merlot grafted on Teleki Kober 5BB rootstock

Gyöngyi Németh,Orsolya Hegyi,Attila Dunai,Laszlo Kocsis

doi:10.20870/oeno-one.2016.50.4.1068

Abstract

Aim: To determine which of the grapevine organ is the richest in stilbene, like the t-piceid, t-resveratrol and ε-viniferin and would it be useful as by-product of viticulture for processing stilbene concentrate.Methods and results: Nine organs, such as cane, buds, shoot tips, inflorescences, clusters at veraison, matured berry skins, seeds and cluster stems, of Merlot grafted on Teleki Kober 5BB rootstock were collected during a year and its ethanolic extractions were analyzed via HPLC-FLD. Stilbene content of the different organs occurred in a wide range, the lowest was 3.15 mg/kg dry weight (dw) measured in the seeds and the highest 2265 mg/kg dw in the buds.Conclusion: The present research demonstrated that different grapevine organs contain different amount of stilbene in the vineyard. The winter-buds, the roots and the matured cane internodes of Merlot are significantly richer in t-resveratrol and t-ε-viniferin than the green vegetative and generative parts we examined in one growing year. Significance and impact of the study: According to our knowledge there was no stilbenes measuring in several plant organs of a vine cultivar in field study, in vineyard. Our research pointed out the pruned cane could be primary source of stilbene of the health-industry. Beside that grape root is a by-product of grapevine nursery is also rich in stilbene.

Highlights

Stilbenes are natural phenolic compounds occurring in a number of plant families including Vitaceae
The winter-buds, the roots and the mature cane internodes of Merlot are significantly richer in t-resveratrol and ε-viniferin than the green vegetative and generative parts that we examined over one year
No measurement of stilbene content in several plant organs of a vine cultivar in a field study has been reported, and only limited data are available on grape root resveratrol and ε-viniferin content

Summary

Introduction

Stilbenes are natural phenolic compounds occurring in a number of plant families including Vitaceae. Resveratrol is a low molecular weight stilbene molecule, its 3-O-glucoside is piceid and one of the resveratrol oligomers is ε-viniferin, a dehydrodimer. Resveratrol and its derivatives are naturally produced by plants as self-defence agents either in response to biotic or abiotic stress or constitutively without elicitors (Jeandet et al, 2010), and can be considered as phytoalexins and phytoanticipins. No measurement of stilbene content in several plant organs of a vine cultivar in a field study has been reported, and only limited data are available on grape root resveratrol and ε-viniferin content

Objectives

Methods

Results

Conclusion