Identification of several small main-effect QTLs and a large number of epistatic QTLs for drought tolerance related traits in groundnut (Arachis hypogaea L.)

Ravi, Kavitha; Vadez, Vincent; Isobe, Sachiko; Mir, Reyazul Rouf; Guo, Yufang; Nigam, S. N.; Gowda, M. V. C.; Radhakrishnan, T.; Bertioli, David J.; Knapp, Steven J.; Varshney, Rajeev K.

doi:10.1007/s00122-010-1517-0

Cited by 194 publications

(188 citation statements)

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“…However, the scatter diagrams of Figure 4 showed that there was still some variation in pod yield besides those explained by the relative HI. Therefore, these residual pod yield unexplained by the % HI component were computed as the difference between the actual pod yields and the predicted pod yield using the regression equation between pod weight and the relative HI, following previous work (Vadez et al 2007b;2011). These residuals were then plotted against TE and showed a very tight relationship under the mild DS-1 stress (R 2 = 0.41), whereas there was a non-significant relation in the other two DS treatments (R 2 = 0.15 in DS-2; R 2 = 0.14 in DS-3) (data not shown).…”

Section: Water Uptake and Te Relationship With Yield Componentsmentioning

confidence: 99%

“…Twenty genotypes were tested and included thirteen breeding lines-cultivars Chico, CSMG 84-1, ICG (FDRS) 10, ICG S 44, ICGS 76, ICGV 00350, ICGV 86015, ICGV 86031, ICGV 91114, ICR 48, JL 24, TAG 24, TMV 2 and seven recombinant inbreed lines (RILs) of a cross between TAG 24 and ICGV 86031, which was previously assessed for mapping drought related QTLs (Krishnamurthy et al 2007;Ravi et al 2011).…”

Section: Plant Materials and Growth Conditionsmentioning

confidence: 99%

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Groundnut (Arachis hypogaea) genotypes tolerant to intermittent drought maintain a high harvest index and have small leaf canopy under stress

Ratnakumar

Vadez

2011

Functional Plant Biol.

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Experiments were conducted in lysimeters to assess root development, water uptake, transpiration efficiency, yield components, and their relationships, in twenty groundnut genotypes under well watered (WW) and mild (DS-1), medium (DS-2), and severe (DS-3) intermittent stress until maturity. Pod yield decreased 70%, 55% and 35% under severe, medium and mild stress, respectively, compared with WW conditions. Pod yield varied among genotypes, and showed highly significant genotype-by-treatment effects.Root length density (RLD) varied among genotypes before and after stress imposition, although RLD did not discriminate tolerant from sensitive lines. Total water uptake and root length density (RLD) under water stress had a significant but weak relationship.Water extraction from the soil profile (total water uptake minus irrigation water), was the highest under the severe stress. Water uptake varied largely among genotypes in all water regimes, but correlated to pod yield under WW conditions only. The relative harvest index, i.e. the ratio of the harvest index under stress to that under WW conditions, was closely related to the pod yield in all three intermittent stresses (R 2 = 0.68 in DS-1; R 2 = 0.65 in DS-2; R 2 = 0.86 in DS-3), and was used as an index of stress tolerance. Under medium and severe stresses, the relative harvest index was negatively related to plant leaf weight (R 2 = 0.79 in DS-2; R 2 = 0.53 in DS-3), but less so under mild stress (R 2 = 0.31).Results suggest that under an intermittent stress, genotypes with lower leaf area may use water more sparingly during drying cycle with less damaging consequences for reproduction and pod development than genotypes having larger leaf area.Additional Keywords: groundnut, water deficit intensities, water uptake, root characteristics, pod yield, lysimetric system Introduction Intermittent water stress occurs in crops that are planted during the rainy season and where gaps in rainfall can expose plants to water stress at any time during the cropping cycle, with possible variation in the timing, the intensity and the duration of the associated water deficits (Serraj et al. 2005). Groundnut typically experiences a range of intermittent stresses and yields are affected when the stress occurs at both vegetative and reproductive phases (Rahmianna et al. 2004). Yield is then highly dependent on the stage when the stress occurs and the available water to the crops at that stage (Ratnakumar et al. 2009).From a breeding point of view, knowing whether different stress intensities would affect groundnut yield differently is also critical to set the screening conditions according to those in the targeted environment, and it is of major interest for this present work.Indeed, even if exposed to an intermittent stress that follows the same frequency during the same phenological period, the intensity of the stress can vary a lot depending on how much water is received each time the stress is relieved by rainfall. Therefore, while selecting for lines adapted to an intermittent s...

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Section: Water Uptake and Te Relationship With Yield Componentsmentioning

confidence: 99%

Section: Plant Materials and Growth Conditionsmentioning

confidence: 99%

Groundnut (Arachis hypogaea) genotypes tolerant to intermittent drought maintain a high harvest index and have small leaf canopy under stress

Ratnakumar

Vadez

2011

Functional Plant Biol.

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“…For example, the first SSRbased genetic linkage map for cultivated groundnut was recently developed for the mapping population, TAG 24 × ICGV 86031 (Varshney et al, 2009b). Subsequently five more genetic maps were developed based on mapping populations segregating for drought and foliar diseases (Gautami et al, 2012a;Ravi et al, 2011;Sujay et al, 2012). A consensus map for drought tolerance related traits with 293 SSR loci (Gautami et al, 2012a) and foliar disease resistance with 225 SSR loci (Sujay et al, 2012), respectively have been developed.…”

Section: Comprehensive Genetic Maps Andmentioning

confidence: 99%

Translational Genomics in Agriculture: Some Examples in Grain Legumes

Varshney

Kudapa

Pazhamala

et al. 2014

Critical Reviews in Plant Sciences

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“…The SSR-based cultivated genetic map with 135 marker loci developed by Varshney et al (2009) was then further saturated to 191 SSR loci (Ravi et al, 2011). Two new partial genetic maps with 56 (TAG 24 3 GPBD 4) and 45 (TG 26 3 GPBD 4) marker loci (Khedikar et al, 2010;Sarvamangala et al, 2011) were constructed covering a genetic distance of 462.24 and 657.9 cM, respectively.…”

Section: Recent Advancement In Genetic Linkage Mapsmentioning

confidence: 99%

Recent Advances in Molecular Genetic Linkage Maps of Cultivated Peanut

et al. 2013

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The competitiveness of peanuts in domestic and global markets has been threatened by losses in productivity and quality that are attributed to diseases, pests, environmental stresses and allergy or food safety issues. Narrow genetic diversity and a deficiency of polymorphic DNA markers severely hindered construction of dense genetic maps and quantitative trait loci (QTL) mapping in order to deploy linked markers in marker-assisted peanut improvement. The U.S. Peanut Genome Initiative (PGI) was launched in 2004, and expanded to a global effort in 2006 to address these issues through coordination of international efforts in genome research beginning with molecular marker development and improvement of map resolution and coverage. Ultimately, a peanut genome sequencing project was launched in 2012 by the Peanut Genome Consortium (PGC). We reviewed the progress for accelerated development of peanut genomic resources in peanut, such as generation of expressed sequenced tags (ESTs) (252,832 ESTs as December 2012 in the public NCBI EST database), development of molecular markers (over 15,518 SSRs), and construction of peanut genetic linkage maps, in particular for cultivated peanut. Several consensus genetic maps have been constructed, and there are examples of recent international efforts to develop high density maps. An international reference consensus genetic map was developed recently with 897 marker loci based on 11 published mapping populations. Furthermore, a high-density integrated consensus map of cultivated peanut and wild diploid relatives also has been developed, which was enriched further with 3693 marker loci on a single map by adding information from five new genetic mapping populations to the published reference consensus map.Key Words: Arachis hypogaea, Arachis species, genomics, genetic maps, molecular markers, molecular breeding, Peanut Genome Consortium (PGC).The world's population is predicted to reach nine billion by 2050 (Nature Editorial, 2010), which means greater demand for food, hence, a continuing need to produce improved cultivars of crop plants. Advances in food production will require greater efforts in agricultural research to increase crop yield with improved genetics for plant protection from biotic and abiotic stresses. Agricultural biotechnology is one tool that holds great promise for sustainability of agricultural production and feeding an ever increasing population.Peanut (Arachis hypogaea L.), or groundnut, is one of the major economically important legumes that is cultivated worldwide for its ability to grow in semi-arid environments with relatively low inputs of chemical fertilizers. On a global basis, peanut also is a major source of protein and vegetable oil for human nutrition, containing about 28% protein, 50% oil and 18% carbohydrates. Peanut is cultivated in more than 100 countries in Asia, Africa and the Americas, grown mostly by resource-limited farmers of the semi-arid regions. India and China together produce almost twothirds of the world's peanuts, and the U...

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Identification of several small main-effect QTLs and a large number of epistatic QTLs for drought tolerance related traits in groundnut (Arachis hypogaea L.)

Cited by 194 publications

References 55 publications

Groundnut (Arachis hypogaea) genotypes tolerant to intermittent drought maintain a high harvest index and have small leaf canopy under stress

Groundnut (Arachis hypogaea) genotypes tolerant to intermittent drought maintain a high harvest index and have small leaf canopy under stress

Translational Genomics in Agriculture: Some Examples in Grain Legumes

Recent Advances in Molecular Genetic Linkage Maps of Cultivated Peanut

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