Basal root whorl number: a modulator of phosphorus acquisition in common bean (Phaseolus vulgaris)

Miguel, Magalhaes Amade; Widrig, A.; Vieira, Rogério Faria; Brown, Kathleen M.; Lynch, Jonathan P.

doi:10.1093/aob/mct164

Cited by 89 publications

(100 citation statements)

References 27 publications

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“…Because OsPSTOL1 in rice has been shown to enhance early root growth (Gamuyao et al, 2012), which is an important mechanism leading to enhanced P acquisition efficiency under low-P availability, we assessed root morphology traits in sorghum plants from the SAPst grown hydroponically using low-P nutrient solution in a paper pouch system. We observed that total root length and root surface area were positively correlated with grain yield under low-P conditions, which is in agreement with reports indicating that results of root morphology analysis in paper pouches correlate with those of plants grown in soil (Liao et al, 2001;Hund et al, 2009;Miguel et al, 2013). This makes Figure 6.…”

Section: Discussionsupporting

confidence: 92%

Duplicate and Conquer: Multiple Homologs ofPHOSPHORUS-STARVATION TOLERANCE1Enhance Phosphorus Acquisition and Sorghum Performance on Low-Phosphorus Soils

et al. 2014

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Low soil phosphorus (P) availability is a major constraint for crop production in tropical regions. The rice (Oryza sativa) protein kinase, PHOSPHORUS-STARVATION TOLERANCE1 (OsPSTOL1), was previously shown to enhance P acquisition and grain yield in rice under P deficiency. We investigated the role of homologs of OsPSTOL1 in sorghum (Sorghum bicolor) performance under low P. Association mapping was undertaken in two sorghum association panels phenotyped for P uptake, root system morphology and architecture in hydroponics and grain yield and biomass accumulation under low-P conditions, in Brazil and/or in Mali. Root length and root surface area were positively correlated with grain yield under low P in the soil, emphasizing the importance of P acquisition efficiency in sorghum adaptation to low-P availability. SbPSTOL1 alleles reducing root diameter were associated with enhanced P uptake under low P in hydroponics, whereas Sb03g006765 and Sb03g0031680 alleles increasing root surface area also increased grain yield in a low-P soil. SbPSTOL1 genes colocalized with quantitative trait loci for traits underlying root morphology and dry weight accumulation under low P via linkage mapping. Consistent allelic effects for enhanced sorghum performance under low P between association panels, including enhanced grain yield under low P in the soil in Brazil, point toward a relatively stable role for Sb03g006765 across genetic backgrounds and environmental conditions. This study indicates that multiple SbPSTOL1 genes have a more general role in the root system, not only enhancing root morphology traits but also changing root system architecture, which leads to grain yield gain under low-P availability in the soil.

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Section: Discussionsupporting

confidence: 92%

Duplicate and Conquer: Multiple Homologs ofPHOSPHORUS-STARVATION TOLERANCE1Enhance Phosphorus Acquisition and Sorghum Performance on Low-Phosphorus Soils

et al. 2014

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“…G19833 is a Peruvian landrace from the Andean gene pool (Beebe et al, 1997). This genotype displays less reduction in secondary growth of roots than DOR 364 under P stress (De la Riva and Lynch 2010) but is classified as P efficient due to the contribution of other beneficial root phenes (phene is to phenotype as gene is to genotype; Serebrovsky, 1925;York et al, 2013), including a shallow basal root angle (Bonser et al, 1996), high basal root whorl number (Miguel et al, 2013), and long, dense root hairs . DOR 364 and G19833 were selected for their contrasting P efficiency and root characteristics and crossed to generate a population of RILs.…”

Section: Germplasmmentioning

confidence: 99%

Reduction in Root Secondary Growth as a Strategy for Phosphorus Acquisition

2017

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We tested the hypothesis that reduced root secondary growth of dicotyledonous species improves phosphorus acquisition. Functional-structural modeling in SimRoot indicates that, in common bean (Phaseolus vulgaris), reduced root secondary growth reduces root metabolic costs, increases root length, improves phosphorus capture, and increases shoot biomass in lowphosphorus soil. Observations from the field and greenhouse confirm that, under phosphorus stress, resource allocation is shifted from secondary to primary root growth, genetic variation exists for this response, and reduced secondary growth improves phosphorus capture from low-phosphorus soil. Under low phosphorus in greenhouse mesocosms, genotypes with reduced secondary growth had 39% smaller root cross-sectional area, 60% less root respiration, 27% greater root length, 78% greater shoot phosphorus content, and 68% greater shoot mass than genotypes with advanced secondary growth. In the field under low phosphorus, these genotypes had 43% smaller root cross-sectional area, 32% greater root length, 58% greater shoot phosphorus content, and 80% greater shoot mass than genotypes with advanced secondary growth. Secondary growth eliminated arbuscular mycorrhizal associations as cortical tissue was destroyed. These results support the hypothesis that reduced root secondary growth is an adaptive response to low phosphorus availability and merits investigation as a potential breeding target.

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“…Genotypes with superior grain yield under drought stress under field conditions and classified as water spenders (Polania et al 2016a) showed higher root vigor with deeper rooting ability under drought stress in the greenhouse. Deep roots may develop from the basal roots that change their root angle to turn downward, or from lateral roots that develop from a tap root, or both (Bonser et al 1996;Ho et al 2005;Basu et al 2007;Lynch 2011;Miguel et al 2013;Beebe et al 2014;Burridge et al 2016). High root vigor and deeper rooting ability in water spender type genotypes allows the plant to access greater amounts of available water, permitting the processes of gas exchange to continue, with the accumulation of water soluble carbohydrates in the stem and their subsequent remobilization to grain filling as was observed in some wheat genotypes (Lopes and Reynolds 2010).…”

Section: Genotypic Differences In Root Vigor and Its Relationship Witmentioning

confidence: 99%

Root traits and their potential links to plant ideotypes to improve drought resistance in common bean

Polanía

Poschenrieder

Rao

et al. 2017

Theor. Exp. Plant Physiol.

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Drought stress limits growth and yield of crops, particularly under smallholder production systems with minimal use of inputs and edaphic limitations such as nitrogen (N) deficiency. The development of genotypes adapted to these conditions through genetic improvement is an important strategy to address this limitation. The identification of morpho-physiological traits associated with drought resistance contributes to increasing the efficiency of breeding programs. A set of 36 bean genotypes belonging to the Middle American gene pool was evaluated. A greenhouse study using soil cylinders was conducted to determine root vigor traits (total root length and fine root production) under drought stress.Two field trials were conducted to determinate grain yield, symbiotic nitrogen fixation (SNF) ability and other shoot traits under drought stress. Field data on grain yield and other shoot traits measured under drought were related with the greenhouse data on root traits under drought conditions to test the relationships between shoot traits and root traits. Response of root vigor to drought stress appeared to be related with ideotypes of water use (water savers and water spenders). The water spender ideotypes presented deeper root system, while the water saver ideotypes showed a relatively shallower root system. Increase in SNF ability under drought stress was associated with greater values of mean root diameter while greater acquisition of N from soil was associated with finer root system. We identified seven common bean lines (SEA 15, NCB 280, SCR 16, SMC 141, BFS 29, BFS 67 and SER 119) that showed greater root vigor under drought stress in the greenhouse and higher values of grain yield under drought stress in the field. These lines could serve as parents for improving drought resistance in common bean.

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Basal root whorl number: a modulator of phosphorus acquisition in common bean (Phaseolus vulgaris)

Abstract: The results indicate that BRWN is associated with increased phosphorus acquisition and that this trait may have value for selection of genotypes with better performance in low phosphorus soils.

Cited by 89 publications

References 27 publications

Duplicate and Conquer: Multiple Homologs ofPHOSPHORUS-STARVATION TOLERANCE1Enhance Phosphorus Acquisition and Sorghum Performance on Low-Phosphorus Soils

Duplicate and Conquer: Multiple Homologs ofPHOSPHORUS-STARVATION TOLERANCE1Enhance Phosphorus Acquisition and Sorghum Performance on Low-Phosphorus Soils

Reduction in Root Secondary Growth as a Strategy for Phosphorus Acquisition

Root traits and their potential links to plant ideotypes to improve drought resistance in common bean

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