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Kernel oil content and oil composition in walnut (Juglans regia L.) accessions from north-eastern Italy.
J Sci Food Agric. 2018 Feb; 98(3):955-962.JS

Abstract

BACKGROUND

Walnut oil use is currently limited by its poor oxidative stability due to the high percentage of polyunsaturated fatty acids. Modifying the oil composition may be a goal in walnut breeding to increase interest in this crop. Exploring natural variability and identifying the main environmental factors affecting oil quality are necessary in crop selection. Therefore 190 wild accessions were collected and evaluated during 2013 and 2014 for oil content and its fatty acid profile and compared with five commercial cultivars as references.

RESULTS

High variation in kernel oil content and fatty acid composition was found in the native walnut. Kernel oil content ranged from 54.2 to 72.2% (w/w). The major fatty acids were linoleic (range 46.9-68.6%), oleic (10.0-25.1%), linolenic (6.9-17.6%), palmitic (3.9-11.4%) and stearic (1.1-5.2%) acids. Some accessions had oil with a fatty acid ratio very different from the reference commercial cultivars, especially the oleic acid/polyunsaturated fatty acid (PUFA) ratio. A significant linear relationship and positive correlation between the daily minimum temperature and oleic acid content was observed in the wild walnuts.

CONCLUSION

The wide variation in fatty acid content and composition allows superior accessions to be selected for diffusion among growers. A suitable strategy would be to make a selection against PUFA content rather than just for high oleic acid. In addition, the selected high oleic accessions, before being utilized per se or as donor parents in breeding programs, have to demonstrate they are not adversely affected by the environment. © 2017 Society of Chemical Industry.

Authors+Show Affiliations

Department of Agricultural, Food, Environmental and Animal Sciences, University of Udine, Udine, Italy. Department of Life Sciences, University of Trieste, Trieste, Italy.Department of Agricultural, Food, Environmental and Animal Sciences, University of Udine, Udine, Italy.Department of Agricultural, Food, Environmental and Animal Sciences, University of Udine, Udine, Italy.Department of Agricultural, Food, Environmental and Animal Sciences, University of Udine, Udine, Italy.Department of Agricultural, Food, Environmental and Animal Sciences, University of Udine, Udine, Italy.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28703854

Citation

Poggetti, Luca, et al. "Kernel Oil Content and Oil Composition in Walnut (Juglans Regia L.) Accessions From North-eastern Italy." Journal of the Science of Food and Agriculture, vol. 98, no. 3, 2018, pp. 955-962.
Poggetti L, Ferfuia C, Chiabà C, et al. Kernel oil content and oil composition in walnut (Juglans regia L.) accessions from north-eastern Italy. J Sci Food Agric. 2018;98(3):955-962.
Poggetti, L., Ferfuia, C., Chiabà, C., Testolin, R., & Baldini, M. (2018). Kernel oil content and oil composition in walnut (Juglans regia L.) accessions from north-eastern Italy. Journal of the Science of Food and Agriculture, 98(3), 955-962. https://doi.org/10.1002/jsfa.8542
Poggetti L, et al. Kernel Oil Content and Oil Composition in Walnut (Juglans Regia L.) Accessions From North-eastern Italy. J Sci Food Agric. 2018;98(3):955-962. PubMed PMID: 28703854.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Kernel oil content and oil composition in walnut (Juglans regia L.) accessions from north-eastern Italy. AU - Poggetti,Luca, AU - Ferfuia,Claudio, AU - Chiabà,Cristina, AU - Testolin,Raffaele, AU - Baldini,Mario, Y1 - 2017/08/28/ PY - 2017/05/17/received PY - 2017/07/06/revised PY - 2017/07/09/accepted PY - 2017/7/14/pubmed PY - 2018/2/3/medline PY - 2017/7/14/entrez KW - PUFAs KW - fatty acid composition KW - oil content KW - oleic acid content KW - walnut breeding KW - walnut germplasm SP - 955 EP - 962 JF - Journal of the science of food and agriculture JO - J. Sci. Food Agric. VL - 98 IS - 3 N2 - BACKGROUND: Walnut oil use is currently limited by its poor oxidative stability due to the high percentage of polyunsaturated fatty acids. Modifying the oil composition may be a goal in walnut breeding to increase interest in this crop. Exploring natural variability and identifying the main environmental factors affecting oil quality are necessary in crop selection. Therefore 190 wild accessions were collected and evaluated during 2013 and 2014 for oil content and its fatty acid profile and compared with five commercial cultivars as references. RESULTS: High variation in kernel oil content and fatty acid composition was found in the native walnut. Kernel oil content ranged from 54.2 to 72.2% (w/w). The major fatty acids were linoleic (range 46.9-68.6%), oleic (10.0-25.1%), linolenic (6.9-17.6%), palmitic (3.9-11.4%) and stearic (1.1-5.2%) acids. Some accessions had oil with a fatty acid ratio very different from the reference commercial cultivars, especially the oleic acid/polyunsaturated fatty acid (PUFA) ratio. A significant linear relationship and positive correlation between the daily minimum temperature and oleic acid content was observed in the wild walnuts. CONCLUSION: The wide variation in fatty acid content and composition allows superior accessions to be selected for diffusion among growers. A suitable strategy would be to make a selection against PUFA content rather than just for high oleic acid. In addition, the selected high oleic accessions, before being utilized per se or as donor parents in breeding programs, have to demonstrate they are not adversely affected by the environment. © 2017 Society of Chemical Industry. SN - 1097-0010 UR - https://www.unboundmedicine.com/medline/citation/28703854/Kernel_oil_content_and_oil_composition_in_walnut__Juglans_regia_L___accessions_from_north_eastern_Italy_ L2 - https://doi.org/10.1002/jsfa.8542 DB - PRIME DP - Unbound Medicine ER -
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