Identification of rice transcription factors associated with drought tolerance using the Ecotilling method.

PloS One
Shunwu YuLijun Luo

Abstract

The drought tolerance (DT) of plants is a complex quantitative trait. Under natural and artificial selection, drought tolerance represents the crop survival ability and production capacity under drought conditions (Luo, 2010). To understand the regulation mechanism of varied drought tolerance among rice genotypes, 95 diverse rice landraces or varieties were evaluated within a field screen facility based on the 'line-source soil moisture gradient', and their resistance varied from extremely resistant to sensitive. The method of Ecotype Targeting Induced Local Lesions in Genomes (Ecotilling) was used to analyze the diversity in the promoters of 24 transcription factor families. The bands separated by electrophoresis using Ecotilling were converted into molecular markers. STRUCTURE analysis revealed a value of K = 2, namely, the population with two subgroups (i.e., indica and japonica), which coincided very well with the UPGMA clusters (NTSYS-pc software) using distance-based analysis and InDel markers. Then the association analysis between the promoter diversity of these transcription factors and the DT index/level of each variety was performed. The results showed that three genes were associated with the DT index and that five g...Continue Reading

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Methods Mentioned

BETA
PCR
electrophoresis
PCRs

Software Mentioned

GRAMENE
Clustal X
TASSEL
TILLING
Vector NTI
STRUCTURE2
TASSEL2
Ecotilling

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