QTLs and epistasis for seminal root length under a different water supply in rice (Oryza sativa L.) |
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Authors: | W P Zhang X Y Shen P Wu B Hu C Y Liao |
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Institution: | (1) Department of Biological Science, Life Science College, Hua-jia-chi Campus, Zhejiang University, Kaixuan Road 268#, Hangzhou, 310029, P.R. China e-mail: docpwu@cls.zju.edu.cn Tel.: 0086-571-6971130, Fax: 0086-571-6971323, CN |
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Abstract: | To identify the genetic background of seminal root length under different water-supply conditions, a recombinant inbred (RI)
population consisting of 150 lines, derived from a cross between an indica lowland rice, IR1552, and a tropical japonica upland rice, Azucena, was used in both solution culture (lowland condition) and paper culture (upland condition). Quantitative
trait loci (QTLs) and epistatic loci for seminal root length were analyzed using 103 restriction fragment length polymorphism
(RFLP) markers and 104 amplified fragment length polymorphism (AFLP) markers mapped on 12 chromosomes based on the RI population.
One QTL for seminal root length in solution culture (SRLS) and one for seminal root length in paper culture (SRLP) were detected
on chromosomes 8 and 1, and about 11% and 10% of total phenotypic variation were explained, respectively. The QTL for SRLP
on chromosome 1 was very similar with the QTL for the longest nodal root referred to in a previous report; this QTL may be
phenotypically selectable in a breeding program using paper culture. Five pairs of epistatic loci for SRLS were detected,
but only one for SRLP, which accounted for about 60% and 20% of the total variation in SRLS and SRLP, respectively. The results
indicate that epistasis is a major genetic basis for seminal root length, and there is a different genetic system responsible
for seminal root growth under different water supply conditions.
Received: 26 May 2000 / Accepted: 19 October 2000 |
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Keywords: | Rice (Oryza sativa L ) Seminal root length Different water supply Quantitative trait loci (QTLs) Epistasis |
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