1,721,204 research outputs found
Phytoplasma and Virus Management in Grapevine Collections for Germplasm Conservation, Mobilization and Evaluation
No full textGrapevine germplasm collections should be considered with a particular respect by the phytosanitary services. They represent a precious source of genetic resources. Not rarely a cultivar is maintained just in one collection.
We have not data for what concerns the sanitary status of the grapevines germplasm collections, but following a general impression, viruses, phytoplasmas and some other bacteria represent a real risk for their exploitation and to a certain extent to their survival.
So a sustainable strategy for germplasm conservation and evaluation should include diagnostic protocols and disease control. Moreover the germplasm mobilization would represent a real opportunity to reduce the risk of loosing biodiversity. In this context specific protocols for germplasm circulation among collections, including specific quarantine procedure management, and more in general for the for phytosanitary
management of the grapevine repositories should be developed to favor the healthy germplasm conservation
Grape seed ripening evaluation by ortho-diphenol quantification
Full text linkTwo millennia of viticulture recognize the seed browning importance on tannin ripening and, thus, on grape and wine quality. This color change was recently attributed to phenolic oxidations. However an objective chemical index able to quantify the oxidation status of seed tannins was missing, probably due to the heterogeneous oxidation polymerizations. This work suggests the adoption of the ortho-diphenol quantification as indication of the tannin ripening process, because ortho-dihydroxylated substitutions are highly susceptible to oxidation. The method proposed is based on the ortho-diphenol characteristic complexation with molybdenum. Different cultivars (Merlot, Pinot noir, Croatina, Aladasturi, Alexandrouli, Odjaleshi and Tavkveri) were studied during three vintages in Oltrepò pavese, Italy. The color darkening correlated with the ortho-diphenol decrease. We believe this index could find useful applications in viticulture, supporting harvesting time decisions
Le grandezze meteoclimatiche come variabili guida per gli ecosistemi agricoli e forestali
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