Breeding beans for resistance to terminal drought in the Lowland tropics

Frahm, Mark; Rosas, Juan Carlos; Máyek-Pérez, Netzahualcóyotl; López-Salinas, Ernesto; Acosta-Gallegos, Jorge Alberto; Kelly, James D.

doi:10.1023/b:euph.0000030671.03694.bb

Cited by 92 publications

(75 citation statements)

References 31 publications

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“…These genotypes include DG 6 (reduced secondary growth), DG 35 (reduced secondary growth), DG 23 (advanced secondary growth), and DG 51 (advanced secondary growth). Additionally, genotypes from the L88 RIL population (developed by J. Kelly, Michigan State University), generated from a cross between drought-resistant B98311 and P-efficient TLP 19 (Frahm et al, 2004), were selected for their differences in secondary growth of roots under low P. These genotypes include L88-14 (reduced secondary growth), L88-63 (reduced secondary growth), L88-43 (advanced secondary growth), and L88-57 (advanced secondary growth). A multiline study by Henry et al (2010) further supports the purported contrast in secondary growth between these genotypes, where under low P in the field, L88-14 had thinner roots and more roots per root core while L88-57 had thicker roots and fewer roots per core.…”

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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Section: Germplasmmentioning

confidence: 99%

Reduction in Root Secondary Growth as a Strategy for Phosphorus Acquisition

2017

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“…Increased rooting depth of root systems has been closely associated with plant adaption to soil moisture deficit (Frahm et al, 2004). One of the strategies by which deep root systems avail plants with soil moisture is by hydraulic distribution (Sun, Meng, Zhang, & Wan, 2014;Whitmore & Whalley, 2009).…”

Section: Mechanisms For Drought Resistancementioning

confidence: 99%

Development of Common Bean (Phaseolus Vulgaris L.) Production Under Low Soil Phosphorus and Drought in Sub-Saharan Africa: A Review

Namugwanya¹,

Tenywa²,

Otabbong³

et al. 2014

JSD

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Owing to its nutritional value, especially proteins, carbohydrates, vitamins and micronutrients, common bean (Phaseolus Vulgaris L.) has been recognised as a crop that could ensure food security mostly, in Sub-Saharan Africa, where its productivity is low. Its low productivity is attributed to a milliard of constraints, of which low plant-available phosphorus (P) and limited moisture in soil are among the major limiting factors. Synergistic effects of the two factors are accentuated in Sub-Saharan African region. This paper discloses the importance of the synergistic effects of plant-available P and moisture in soils on common bean production. It has been observed that studies investigating impacts of interactions of low P levels and moisture deficit conditions in soils are yet to be conducted. Identification of traits that contribute to high performance under low P availability and moisture deficit in the same genotypes remains a major research and development challenge. However, engineering new genotypes alone may not alleviate the problem of ensuring improvement of high bean yields. Root architecture and root exploration of the soil that enable the plant to access the two soil resources, traditional methods that preserve good status of organic matter in soils and moisture and soil preparation techniques are equally important. This, calls for holistic investigations that include soil plant-available P and moisture, common bean genotypes and their root systems, and agronomic measures to facilitate a comprehensive evaluation of impacts of deficiencies in soils on common bean yields. This paper explores and synthesizes existing research and development of common bean grown in soils deficient in plant-available P and moisture, aiming at designing future research to enhance common bean productivity.

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“…Six genotypes (parents B98311 and TLP19 and recombinant inbred lines [RILs] 15, 57, 7, and 76) of bean (Phaseolus vulgaris) were selected from the L88 population developed by Dr. Jim Kelly at Michigan State University (Frahm et al, 2004). B98311 and RIL7 and RIL76 have deep root systems (BRGA of 41.7°6 14°), and TLP19 and RIL15 and RIL57 have shallow root systems (BRGA of 56.4°6 18°; Basu et al, 2007).…”

Section: Plant Materials and Growth Conditionsmentioning

confidence: 99%

Detailed Quantitative Analysis of Architectural Traits of Basal Roots of Young Seedlings of Bean in Response to Auxin and Ethylene

2011

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Vertical placement of roots within the soil determines their efficiency of acquisition of heterogeneous belowground resources. This study quantifies the architectural traits of seedling basal roots of bean (Phaseolus vulgaris), and shows that the distribution of root tips at different depths results from a combined effect of both basal root growth angle (BRGA) and root length. Based on emergence locations, the basal roots are classified in three zones, upper, middle, and lower, with each zone having distinct architectural traits. The genotypes characterized as shallow on BRGA alone produced basal roots with higher BRGA, greater length, and more vertically distributed roots than deep genotypes, thereby establishing root depth as a robust measure of root architecture. Although endogenous indole-3-acetic acid (IAA) levels were similar in all genotypes, IAA and 1-N-naphthylphthalamic acid treatments showed different root growth responses to auxin because shallow and deep genotypes tended to have optimal and supraoptimal auxin levels, respectively, for root growth in controls. While IAA increased ethylene production, ethylene also increased IAA content. Although differences in acropetal IAA transport to roots of different zones can account for some of the differences in auxin responsiveness among roots of different emergence positions, this study shows that mutually dependent ethylene-auxin interplay regulates BRGA and root growth differently in different genotypes. Root length inhibition by auxin was reversed by an ethylene synthesis inhibitor. However, IAA caused smaller BRGA in deep genotypes, but not in shallow genotypes, which only responded to IAA in the presence of an ethylene inhibitor.

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Breeding beans for resistance to terminal drought in the Lowland tropics

Cited by 92 publications

References 31 publications

Reduction in Root Secondary Growth as a Strategy for Phosphorus Acquisition

Reduction in Root Secondary Growth as a Strategy for Phosphorus Acquisition

Development of Common Bean (Phaseolus Vulgaris L.) Production Under Low Soil Phosphorus and Drought in Sub-Saharan Africa: A Review

Detailed Quantitative Analysis of Architectural Traits of Basal Roots of Young Seedlings of Bean in Response to Auxin and Ethylene

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