Allele mining for a drought responsive gene DRO1 determining root growth angle in donors of drought tolerance in rice (Oryza sativa L.)

Breeding for drought tolerance revolves around selection of genotypes with desirable root characters. Root pattern studies in rice have shown significant relationship with drought tolerance. In order to understand the effects of deep rooting pattern and root growth angle in relation to water stress was assessed following basket method. The Backcross inbred lines (BILs) of ADT (R) 45*1/Apo and ADT (R) 45*1/Wayrarem with drought QTLs viz., qDTY1.1, qDTY3.1, qDTY4.1 and qDTY12.1 were evaluated for various root traits. Out of 20 BILs and three parental lines studied four BILs showed high values for root growth at deep angle 65-90 °and yield under drought stress. Based on association studies among the root traits positive and significant correlation was observed between yield and root traits viz., root dry weight, root growth at deep angle 65-90° (RA4), ratio of deep rooting and root length. Clustering of BILs and parents have grouped deep rooting BILs and drought tolerant donors into one cluster and drought susceptible ADT (R) 45 into a separate cluster II which clearly indicates, the importance of deep rooting and yield under drought stress. Strong association of root traits and drought tolerance clearly shows the importance in utilization of these traits as selection criteria for drought tolerance in rice.

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Retraction: “Screening of candidate genes and fine mapping of drought tolerance quantitative trait loci on chromosome 4 in rice (Oryza sativa L.) under drought stress” by Nie, Y. Y., L. Zhang, Y. H. Wu, H. J. Liu, W. W. Mao, J. Du, et al.

Ecology and Evolution ◽

10.1002/ece3.1855 ◽

2015 ◽

Vol 6 (1) ◽

pp. 375-375

Keyword(s):

Oryza Sativa ◽

Drought Stress ◽

Quantitative Trait Loci ◽

Drought Tolerance ◽

Candidate Genes ◽

Fine Mapping ◽

Quantitative Trait ◽

Oryza Sativa L ◽

Chromosome 4 ◽

Trait Loci

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Water uptake dynamics under progressive drought stress in diverse accessions of the OryzaSNP panel of rice (Oryza sativa)

Functional Plant Biology ◽

10.1071/fp12015 ◽

2012 ◽

Vol 39 (5) ◽

pp. 402 ◽

Cited By ~ 28

Author(s):

Veeresh R. P. Gowda ◽

Amelia Henry ◽

Vincent Vadez ◽

H. E. Shashidhar ◽

Rachid Serraj

Keyword(s):

Oryza Sativa ◽

Drought Stress ◽

Root Growth ◽

Water Uptake ◽

Root Length Density ◽

Oryza Sativa L ◽

Root Water Uptake ◽

Snp Markers ◽

Drought Response ◽

Genotypic Differences

In addition to characterising root architecture, evaluating root water uptake ability is important for understanding drought response. A series of three lysimeter studies were conducted using the OryzaSNP panel, which consists of 20 diverse rice (Oryza sativa L.) genotypes. Large genotypic differences in drought response were observed in this genotype panel in terms of plant growth and water uptake. Total water uptake and daily water uptake rates in the drought-stress treatment were correlated with root length density, especially at depths below 30 cm. Patterns of water uptake among genotypes remained consistent throughout the stress treatments: genotypes that initially extracted more water were the same genotypes that extracted more water at the end of the study. These results suggest that response to drought by deep root growth, rather than a conservative soil water pattern, seems to be important for lowland rice. Genotypes in the O. sativa type aus group showed some of the greatest water uptake and root growth values. Since the OryzaSNP panel has been genotyped in detail with SNP markers, we expect that these results will be useful for understanding the genetics of rice root growth and function for water uptake in response to drought.

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