Detection and analysis of QTLs for ferrous iron toxicity tolerance in rice, Oryza sativa L. |
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Authors: | Jian-lin Wan Hu-qu Zhai Jian-min Wan H Ikehashi |
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Institution: | (1) State Key laboratory of crop genetics and germplasm enhancement, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China;(2) Chinese Academy of Agricultural Sciences, Beijing, 100081, People's Republic of China;(3) Department of Breeding, Nihon University, 1866 Kameino, Fujisawa-shi, Japan |
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Abstract: | A mapping population of 96 BC1F9lines (Backcross Inbred Lines: BILs),derived by a single-seed descent method rom a backcross of Nipponbare (japonica) / Kasalath (indica // Nippon are, was used to detect quantitative trait loci (QTLs) for leaf bronzing index (LBI), stem dry weight (SDW), tiller
number (TN) and root dry weight (RDW) under Fe2+ stress condition in rice. Two parents and 96 BILs were phenotyped for the traits by growing them in Fe2+ toxicity nutrient solution. A total of four QTLs were detected on chromosome 1 and 3, respectively, with LOD of QTLs ranging
from 3.17 to 7.03. One QTL controlling LBI, DW, N and RDW was located at the region of C955-C885 on chromosome 1, and their
contributions to whole variation were 20.5%, 36.9%, 43.9% and 38.8%,respectively. The QTL located at the region of C955-C885
on chromosome 1 may be important to ferrous iron toxicity tolerance in rice. Another QTL for SDW and RDW was located at the
region of C25-C515 on chromosome 3, with respective contributions of 47.9% and 35.0% to whole variation. Further, two QTLs
on chromosome 1 were located for RDW at the region of R2329-R210 and for TN at the region of R1928-C178. Comparing with the
other mapping results, the QTL located at the region of C955-C885 on chromosome 1 was identical with the results reported
previously. There is a linkage between a TL detected under Fe2+ stress condition for stem and root dry weight and a QTL detected under phosphorus-deficiency condition for dry weight on
chromosome 3.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | BIL population ferrous iron toxicity tolerance QTL analysis rice |
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