Genetic dissection of root growth in rice (Oryza sativa L.).
II: mapping quantitative trait loci using molecular markers

Price, Adam H.; Tomos, A. D.

doi:10.1007/s001220050542

Cited by 183 publications

(95 citation statements)

References 27 publications

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“…Plant roots perform many essential functions, including water and nutrient uptake, storage of reserves, synthesis of specific compounds, anchorage to the soil, and the establishment of biotic interactions in the rhizosphere (Ló pez-Bucio et al, 2003). The size and the architecture of the root system determine the plant's ability to access water and nutrients, factors that limit growth and, thus, yield in many agricultural ecosystems (Lynch, 1995;Price et al, 1997). As water and nutrient shortages pose increasing problems in agriculture, understanding and manipulation of root architecture becomes more important.…”

Section: Introductionmentioning

confidence: 99%

Root-Specific Reduction of Cytokinin Causes Enhanced Root Growth, Drought Tolerance, and Leaf Mineral Enrichment in Arabidopsis and Tobacco

et al. 2010

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Optimizing root system architecture can overcome yield limitations in crop plants caused by water or nutrient shortages. Classic breeding approaches are difficult because the trait is governed by many genes and is difficult to score. We generated transgenic Arabidopsis thaliana and tobacco (Nicotiana tabacum) plants with enhanced root-specific degradation of the hormone cytokinin, a negative regulator of root growth. These transgenic plants form a larger root system, whereas growth and development of the shoot are similar. Elongation of the primary root, root branching, and root biomass formation were increased by up to 60% in transgenic lines, increasing the root-to-shoot ratio. We thus demonstrated that a single dominant gene could regulate a complex trait, root growth. Moreover, we showed that cytokinin regulates root growth in a largely organ-autonomous fashion that is consistent with its dual role as a hormone with both paracrine and long-distance activities. Transgenic plants had a higher survival rate after severe drought treatment. The accumulation of several elements, including S, P, Mn, Mg, Zn, as well as Cd from a contaminated soil, was significantly increased in shoots. Under conditions of sulfur or magnesium deficiency, leaf chlorophyll content was less affected in transgenic plants, demonstrating the physiological relevance of shoot element accumulation. Our approach might contribute to improve drought tolerance, nutrient efficiency, and nutrient content of crop plants.

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Section: Introductionmentioning

confidence: 99%

Root-Specific Reduction of Cytokinin Causes Enhanced Root Growth, Drought Tolerance, and Leaf Mineral Enrichment in Arabidopsis and Tobacco

et al. 2010

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“…In a previous paper we characterized hydroponic root growth of rice varieties and populations (Price, Tomos & Virk, 1997). We reported that 'Bala', an improved semidwarf upland variety from India (which was derived from a cross of an indica and an aus variety (Chaudhary & Rao, 1982)) had a good drought performance despite possessing a poor root system.…”

Section: Introductionmentioning

confidence: 99%

Quantitative trait loci associated with stomatal conductance, leaf rolling and heading date mapped in upland rice (Oryza sativa)

1997

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SUMMARYImproving the drought resistance of high yielding rice {Oryza sativa L.) varieties for upland areas is a goal of rice breeders since upland rice relies exclusively on rainfall for water and is generally low yielding. Identifying quantitative trait loci (QTLs) which confer drought resistance promises to speed this goal. We have previously described the use of 82 restriction fragment length polymorphism (RFLP) markers in the genetic mapping of root growth characteristics that are potentially involved in drought resistance in a population of 178 Fg plants derived from a cross of two drought resistant upland varieties, Azucena and Bala. Here we report the characterization and QTL mapping of three other mechanisms of drought resistance, leaf rolling, stomatal behaviour and early flowering, in this population. When the youngest fully expanded leaf was excised from 12 rice varieties, 'IR20' and 'Bala' were identified as slow at rolling. Although 'Azucena' rolled its leaves much faster than 'Bala' upon excision, stomatal resistance rose more rapidly in 'Bala', resulting in a lower rate of water loss. By assessing leaf rolling and stomatal resistance in the Fg population, it was possible to identify QTLs for these traits. A QTL for slow leaf rolling from 'Bala' was found on chromosome 1. Two QTLs associated with resting stomatal conductance were found on chromosomes 3 and 12. QTLs for the rate of stomatal closure were found on chromosomes 3 and 7. In addition, it was possible to map QTLs associated with the days to heading which were found on chromosomes 3, 8 and 10. These results identify markers of potential value to breeders and are discussed in the context of previously reported data for heading date QTLs in rice and for stomatal conductance QTLs in maize.

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“…The results suggest that QTLs for root length uncovered under hydroponics may be predictive of enhanced grain yield under field conditions (Obara et al 2011). This approach has been widely used to detect QTLs associated with improved root systems in both stressed and nonstressed rice fields (Price et al 1997;Shimizu et al 2004). However, QTL studies for root traits using mapping populations from crosses between japonica accessions are limited.…”

Section: Introductionmentioning

confidence: 99%

QTL Mapping of Rice Root Traits at Different NH4+ Levels in Hydroponic Condition

Kim¹,

Kim²,

Kang³

et al. 2015

Plant Breed. Biotech.

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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.Plant Breed. Biotech. 2015 (September) . Seven chromosomal regions were found to be involved in root elongation. The qRW6 QTL detected on the long-arm of chromosome 6 promoted root weight and the 'Moroberekan' allele at this QTL was associated with enhanced root weight at 250 µM NH4 + concentration. The Moroberekan alleles were beneficial at all loci except for qRW4 at which the Ilpumbyeo allele increased root weight under 0, 250 and 500 µM NH4 + . A field trial was conducted for selected four ILs to know whether the introgressed Moroberekan segments harboring the beneficial QTL were associated with effects on other agronomic traits. No significant difference was detected between four ILs and Ilpumbyeo for days to heading and culm length. Two lines showed significant difference from Ilpumbyeo in spikelets per panicle and 1,000 grain weight, and the difference might be attributed to the Moroberekan segment on chromosome 6. Our QTL results indicate that the Moroberekan introgression on chromosome 6 flanked by RM162-RM3430 has the potential to enhance root traits and yield potential in the temperate japonica background.

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Genetic dissection of root growth in rice (Oryza sativa L.). II: mapping quantitative trait loci using molecular markers

Cited by 183 publications

References 27 publications

Root-Specific Reduction of Cytokinin Causes Enhanced Root Growth, Drought Tolerance, and Leaf Mineral Enrichment in Arabidopsis and Tobacco

Root-Specific Reduction of Cytokinin Causes Enhanced Root Growth, Drought Tolerance, and Leaf Mineral Enrichment in Arabidopsis and Tobacco

Quantitative trait loci associated with stomatal conductance, leaf rolling and heading date mapped in upland rice (Oryza sativa)

QTL Mapping of Rice Root Traits at Different NH4+ Levels in Hydroponic Condition

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