Prominent Differences in Leaf Fatty Acid Composition in the F1 Hybrid Compared with Parent Trees Larix gmelinii var. japonica and L. kaempferi

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  • SATO Mayumi
    Hokkaido Forest Products Research Institute United Graduate School of Agricultural Science, Iwate University
  • SEKI Kazuto
    Hokkaido Forest Products Research Institute
  • KITA Kazuhito
    Hokkaido Forestry Research Institute
  • MORIGUCHI Yoshinari
    Forestry and Forest Products Research Institute
  • YUNOKI Keita
    Department of Agricultural and Life Science, Obihiro University of Agriculture and Veterinary Medicine
  • KOFUJITA Hisayoshi
    United Graduate School of Agricultural Science, Iwate University
  • OHNISHI Masao
    United Graduate School of Agricultural Science, Iwate University Department of Agricultural and Life Science, Obihiro University of Agriculture and Veterinary Medicine

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  • Prominent Differences in Leaf Fatty Acid Composition in the F<sub>1</sub>Hybrid Compared with Parent Trees<i>Larix gmelinii</i>var.<i>japonica</i>and<i>L. kaempferi</i>

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Fatty acid (FA) compositions in leaves were investigated for two families of F1 hybrids of Larix gmelinii var. japonica × L. kaempferi (F1) and their parent clones. Twenty-one FAs, from C12 to C32, were found in the leaves of both adult trees and seedlings. The levels of 18:1/(18:2 + 18:3) increased in the order L. kaempferi, F1, and L. gmelinii var. japonica, with significant differences between L. gmelinii var. japonica and F1 in adult trees, but these differences were not found in the seedlings. Moreover, in the adult trees, the 18:1/(18:2 + 18:3) levels in the neutral phospholipid fraction and the ΣC18/ΣC16, especially in the glycolipid fraction, showed significant differences among the three species. These characteristics are discussed from the viewpoint of lipid synthesis in the endoplasmic reticulum and chloroplasts, and of the activities and substrate specificities in sequential FA desaturation. Linear discriminant analysis suggested that the FA compositions are useable as an index in the identification of hybrid seedlings.

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