Reference "QTLs and epistasis for seminal root length under a different water supply in rice (Oryza sativa L.)."

Reference ID

7840

Title

QTLs and epistasis for seminal root length under a different water supply in rice (Oryza sativa L.).

Source

Theoretical and applied genetics, 2001, vol. 103(1), pp. 118-123

Authors (5)

Zhang-W-P	Shen-X-Y
Wu-P	Hu-B
Liao-C-Y

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 low-land 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.