Relationship Between Coleoptile Length and Drought Resistance and 
Their QTL Mapping in Rice

Abstract

Abstract: By using a set of recombinant inbred line (RIL) population involving in 195 lines derived from a cross of Zhenshan 97B
(lowland variety) and IRAT109 (upland variety), the correlation analysis between coleoptile length (CL) and drought resistance index
(DRI) and their QTL identification were conducted. There existed a significantly positive relationship between CL and DRI with the
correlation coefficient of 0.2206** under water stress conditions. Under normal and water stress conditions, a total of eleven and four
QTLs for CL and DRI, respectively, were detected on chromosomes 1, 2, 4, 5, 6, 7, 9, 11 and 12 by using a linkage map including 213
SSR markers, which explained 4.84% to 22.65% of phenotypic variance. Chromosomes 1 and 9 possessing the QTLs for DRI
harbored simultaneously QTLs for CL, and qCL9 shared the same chromosome location with qDRI9 (RM160-RM215). Comparing the
QTLs related to drought resistance in other studies, QTLs for CL and DRI were located in the same or adjacent marker interval as
those related to root traits, such as number, dry weight, depth, and length of root. Moreover, sixteen and three pairs of epistatic loci for
CL and DRI were found, which accounted for 56.17% and 11.93% of the total variation in CL and DRI, respectively.
Key words:

Key words: recombinant inbred lines, coleoptile length, drought resistance index, quantitative trait loci, rice

HU Song-ping, YANG Hua, ZOU Gui-hua, LIU Hong-yan, LIU Guo-lan, MEI Han-wei, CAI Run , LI Ming-shou , LUO Li-jun. Relationship Between Coleoptile Length and Drought Resistance and
Their QTL Mapping in Rice[J]. RICE SCIENCE, 2007, 14(1): 13-20 .

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