Drought is a major yield-limiting factor for rice production. In drying soils, plants experience
water scarcity and soil compaction. Penetration of deep roots in hard soil can improve crop
productivity under drought. It has been shown that stele is an important anatomical predictor for
root penetrability. Here, we studied genetic controls of root stele by quantitative trait loci analysis
(QTL). One hundred and thirty-five chromosome segment substitutive lines derived from a cross
between, KDML 105 and IR68586-F2-CA-31 (DH103) and IR68586-F2-CA-143 (DH212) were
used as mapping population. Plants were grown in the field under well-watered and drought
conditions. Under drought, rice decreased leaf weight by 16.63% but increased stele area by 20.21%.
Stele traits were significantly correlated with root thickness in well-watered (r= 0.57) and drought
conditions (r= 0.70). We identified 4 SNP markers on chromosomes 1, 4, and 9 which explained
9.47% to 11.36% of individual phenotypic variance. A marker on chromosomes 1 were found to
be co-localized with previously described QTL for basal root thickness in double haploid rice
mapping populations. These markers could be further developed to assist in rice breeding program.
Keywords
Rice root, stele, drought
ENIVRONMENT ASIA
Published by : Thai Society of Higher Education Institutes on Environment Contributions welcome at : http://www.tshe.org/en/
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