Study on the variation of Cry j 1 content per pollen grain among 420 clones in 25 prefectures [in Japan] and estimating of heritability on Cry j 1 in sugi (Cryptomeria japonica D. Don)
2003
Saito, M. (Toyama-ken. Forestry and Forest Products Research Center, Kosugi (Japan)) | Teranishi, H. | Taira, H.
Saito, M., Teranishi, H., and Taira, H. : Study on the Variation of Cry j 1 Content per Pollen Grain among 420 Clones in 25 Prefectures and Estimating of Heritability on Cry j 1 in Sugi ( Crgptomeria japonica D. Don). J. Jpn. For. Soc. 85 : 312-317, 2003 In order to clarify the relationship between prevalence of Japanese cedar pollinosis and allergen content, we collected pollen of 420 elite trees from 25 prefectures and investigated the variation of Cry j 1 content. There was no difference in Cry j 1 content among 4 regions (1) Hokkaido·Tohoku(2) Kanto ' Tokai, (3) Hokuriku and (4) Kansai). So, it was thought that the prevalence is largely affected by the amount of dispersion pollen. Cry j 1 content of 420 clones showed variation from O.38 to 10.23 pg per pollen grain and 7 clones had less than one pg per pollen grain. The heritability of Cry j 1 estimated by parent-offspring regression was very high at 1 . O. From these results, it was suggested that a large number of sugi (C. japonica D. Don) trees with low allergens could be created by crossing the 7 trees selected in this study
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