Genetic variation of storage compounds and seed weight in rapeseed (Brassica napus L.) germplasms

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  • Kennedy Yoko
    Faculty of Agriculture, Iwate University Genesis Research Institute Inc.
  • Yokoi Shuji
    Faculty of Agriculture, Iwate University
  • Sato Tetsuo
    National Agricultural Research Center for Kyushu Okinawa Region, National Agricultural and Food Research Organaization
  • Daimon Hiroyuki
    School of Life and Environmental Science, Osaka Prefecture University
  • Nishida Ikuo
    Faculty of Science, Saitama University
  • Takahata Yoshihito
    Faculty of Agriculture, Iwate University

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One thousand five hundred rapeseed accessions were collected from gene banks in several countries and surveyed for their seed traits such as oil content, protein content, fatty acid composition and seed weight. Seed chemicals were analyzed by near-infrared reflectance spectroscopy (NIRS). An extensive genetic variation existed among accessions for all seed traits examined. The oil content ranged from 24.7 to 56.9%, and the protein content ranged from 6.7 to 36.6%. A hundred seed weight ranged from 0.13 to 0.70 g. The fatty acid compositions of germplasms also varied from 2.6 to 9.2% of C16:0 (palmitic acid), 0.3 to 70.2% of C18:1 (oleic), 10.3 to 28.9% of C18:2 (linoleic), 4.8 to 15.3% of C18:3 (linolenic), 0 to 10.5% of C20:1(eicosenoic) and 0 to 59.6% of C22:1 (erucic). The oil content had strong negative correlation with protein content (r = −0.848). However, it did not have any close correlations with other traits. When the genetic stability of seed traits was examined by comparison between original seeds and self-pollinated seeds (S1 seeds), higher positive and significant correlation coefficients between original seeds and S1 seeds were found in all seed traits.<br>

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