Breeding Science
Online ISSN : 1347-3735
Print ISSN : 1344-7610
ISSN-L : 1344-7610
Research papers
Transgressive segregation of isoflavone contents under the control of four QTLs in a cross between distantly related soybean varieties
Takanori Yoshikawa, Yutaka Okumoto, Daisuke Ogata, Takashi Sayama, Masayoshi Teraishi, Masakazu Terai, Toshiya Toda, Katsushige Yamada, Kazuhiro Yagasaki, Naohiro Yamada, Takuji Tsukiyama, Toshiaki Yamada, Takatoshi Tanisaka
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Keywords: Glycine max (L) Merr., isoflavone content, QTL, recombinant inbred line, transgressive segregation
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2010 Volume 60 Issue 3 Pages 243-254

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Abstract

Soybean (Glycine max (L) Merr.) isoflavones have attracted considerable attention for their diverse effects on human health. To determine the genetic factors that contribute to the high isoflavone contents of the soybean varieties ‘Peking’ and ‘Tamahomare’, we conducted QTL analyses for the total content of daidzein derivatives (DAC), genistein derivatives (GEC) and glycitein derivatives (GLC), and for the total content of isoflavones (TIC) using recombinant inbred lines (RILs) derived from the cross between ‘Peking’ and ‘Tamahomare’. Ninety six RILs were planted in Kyoto, Osaka and Nagano in 2003 and in Osaka and Nagano in 2004. Transgressive segregation for TIC was detected in all the environments tested. Composite interval mapping for TIC revealed four QTLs: qIso1, qIso2, qIso3 and qIso4, located on LG-A1 (Chr.5), LG-A2 (Chr.8), LG-C1 (Chr.4) and LG-D2 (Chr.17), respectively. The high-isoflavone alleles were derived from Peking at qIso1 and qIso4 and from Tamahomare at qIso2 and qIso3. Several other groups have already reported the former two QTLs, but qIso2 and qIso3 are new discoveries. Our results indicate that the large variation in TIC measurements observed in the RILs could have resulted from the combined effects of alleles at the four QTLs derived from distantly related varieties.

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© 2010 by JAPANESE SOCIETY OF BREEDING
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