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Comparative Study
. 2006 Feb;172(2):1213-28.
doi: 10.1534/genetics.105.045062. Epub 2005 Nov 4.

Genetic basis of drought resistance at reproductive stage in rice: separation of drought tolerance from drought avoidance

Bing Yue  1 , Weiya Xue, Lizhong Xiong, Xinqiao Yu, Lijun Luo, Kehui Cui, Deming Jin, Yongzhong Xing, Qifa Zhang
Affiliations
Comparative Study

Genetic basis of drought resistance at reproductive stage in rice: separation of drought tolerance from drought avoidance

Bing Yue et al. Genetics. 2006 Feb.

Abstract

Drought tolerance (DT) and drought avoidance (DA) are two major mechanisms in drought resistance of higher plants. In this study, the genetic bases of DT and DA at reproductive stage in rice were analyzed using a recombinant inbred line population from a cross between an indica lowland and a tropical japonica upland cultivar. The plants were grown individually in PVC pipes and two cycles of drought stress were applied to individual plants with unstressed plants as the control. A total of 21 traits measuring fitness, yield, and the root system were investigated. Little correlation of relative yield traits with potential yield, plant size, and root traits was detected, suggesting that DT and DA were well separated in the experiment. A genetic linkage map consisting of 245 SSR markers was constructed for mapping QTL for these traits. A total of 27 QTL were resolved for 7 traits of relative performance of fitness and yield, 36 QTL for 5 root traits under control, and 38 for 7 root traits under drought stress conditions, suggesting the complexity of the genetic bases of both DT and DA. Only a small portion of QTL for fitness- and yield-related traits overlapped with QTL for root traits, indicating that DT and DA had distinct genetic bases.

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Figures

Figure 1.
Figure 1.
Scatter plots of relative performance of yield and biomass against yield and biomass under control conditions in 2003 (left) and 2004 (right). (A) Relative yield against yield under control; (B) relative biomass against biomass under control; (C) relative yield against biomass under control; (D) relative biomass against yield under control.
Figure 2.
Figure 2.
The molecular marker linkage map based on the RIL population from a cross between Zhenshan 97 and IRAT109. Genetic distance is given in Kosambi centimorgans. The QTL for above-ground traits and root traits are placed on the left and right sides of the chromosomes, respectively. QTL detected in both years are shown in boldface type. QTL in italics indicate that the alleles for increasing trait values are from Zhenshan 97. The full names of the traits are listed in Table 1.
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References

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