Abstract
<p style="text-align: justify;"><span style="font-size: medium;"><strong>Aim: </strong>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.</span></p><p style="text-align: justify;"><span style="font-size: medium;"><strong>Methods and results: </strong>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.</span></p><p style="text-align: justify;"><span style="font-size: medium;"><strong>Conclusion:</strong> 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. </span></p><p style="text-align: justify;"><span style="font-size: medium;"><strong>Significance and impact of the study: </strong>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. </span></p>
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
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
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