%A Van Loc Nguyen
%A Thi Thu Hien Dang
%A Duc ha Chu
%A Nakamura Tetsuhiro
%A Tomomi Abiko
%A Mochizuki Toshihiro
%J Euphytica
%T Near-isogenic lines of soybean confirm a QTL for seed
waterlogging tolerance at different temperatures
%X Climate change is predicted to increase the
probability of soil waterlogging due to severe rainfall,
causing significant damage to soybean at the germi�nation stage. Germination under waterlogging is also
greatly influenced by temperature. To clarify the
variation in germination responses of soybean geno�types to waterlogging at different temperatures, the
seeds of 15 soybean genotypes were treated by
soaking for 2 days at four temperatures: 21 �C,
23 �C, 25 �C, 27 �C and 29 �C. Differences in the
germination rate (GR) and normal seedling rate (NSR)were observed among soybean genotypes after soak�ing treatments regardless of the temperature. Among
the examined genotypes, Iyodaizu was classified as
waterlogging tolerant at the germination stage, and
Tachinagaha was classified as sensitive. Interestingly,
through the analyses of recombinant inbred lines
(RILs) developed from a cross between Tachinagaha
and Iyodaizu, quantitative trait loci (QTLs) for root
development under hypoxia at the seedling stage of
soybean were detected on chromosome 12
(Chr.12).We investigated whether the candidate QTL
region for root development is involved in seed
waterlogging tolerance by using a near-isogenic line
(NIL), NIL-9-4-5. Interestingly, under soaking treat�ment, the GR and NSR of NIL-9-4-5, carrying the
candidate QTL region, was nearly the same as that of
Iyodaizu and was significantly higher than that of
Tachinagaha. These results may indicate that the
candidate QTL region for root development under
hypoxia at the seedling stage located on Chr.12
contributes to the seed waterlogging tolerance of
soybean plants at the germination stage.
%I Springer
%L SisLab4460