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CROP BREEDING, GENETICS & CYTOLOGY

Genotype x Environment Interactions and Heritability of Tocopherol Contents in Canola

^a Institute of Agronomy and Plant Breeding, Georg-August-University Göttingen, Von-Siebold-Str. 8, 37075 Göttingen, Germany
^b Ernst Benary Samenzucht GmbH, Postfach 1127, 34331 Hann. Münden, Germany

^* Corresponding author (hbecker1{at}gwdg.de).

Tocopherols are natural antioxidants found in all vegetable oils. They are important dietary nutrients and thus breeding for increased tocopherol content is a new and important objective in canola (Brassica napus L.). Tocopherols exist in four forms (-, ß-, -, and -tocopherol) differing in molecular structure and biological effectiveness. In the seed oil of canola, mainly - and -tocopherol are found with an /-tocopherol ratio of about 0.5. Three canola populations of doubled haploid lines were grown in three to four field environments to analyze genetic variance and genotype x environment interactions as well as heritability of tocopherols and correlations with other seed components. Significant genotypic differences occur, but large genotype x environment interactions are the major source of variation. Heritability of tocopherol was low in all three populations; the estimates ranged from 0.23 to 0.44 for -tocopherol and from 0.33 to 0.50 for -tocopherol. Heritability for tocopherol content is considerably lower than heritability of oil content (0.56–0.90), protein content (0.43–0.76), or glucosinolate content (0.91–0.95). No correlation between - and -tocopherol or between tocopherol and oil, protein, and glucosinolate content was detected. Individual tocopherols can be increased independently of each other and without affecting other major quality traits.

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Crop Science 2004 44: 707-710. [Full Text]  

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