Root anatomical phenes associated with water acquisition from drying soil: targets for crop improvement

Lynch, Jonathan P.; Chimungu, Joseph G.; Brown, Kathleen M.

doi:10.1093/jxb/eru162

Cited by 257 publications

(231 citation statements)

References 124 publications

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“…Recent studies on the importance of size of roots to grain yields and the timing of soil water utilisation for maximising grain yields under terminal DS had drawn variable conclusions such as positive (Sponchiado et al 1989;White and Castillo 1992;Eghball and Maranville 1993;Kramer and Boyer 1995;Lynch 1995Lynch , 2013Pandey et al 2000aPandey et al , 2000bLiao et al 2004;Nord and Lynch 2009;Puangbut et al 2009;Lopes and Reynolds 2010;Manschadi et al 2010;Zhu et al 2010;Franco et al 2011;Kell 2011;Trachsel et al 2011;Suji et al 2012;Wasson et al 2012Wasson et al , 2014Comas et al 2013;Jaramillo et al 2013;Uga et al 2013; Root traits contribution to drought tolerance Functional Plant Biology Fenta et al 2014;Chimungu et al 2014aChimungu et al , 2014bLynch et al 2014;Bishopp and Lynch 2015) and negative or null (Ritchie 1981;Dardanelli et al 2004;CIAT 2007CIAT , 2008Beebe et al 2009;Itoh et al 2009;Ma et al 2010;Manavalan et al 2011;Ratnakumar et al 2009;Zaman-Allah et al 2011;Kumar et al 2012;…”

Section: Adaptation To Terminal Droughtmentioning

confidence: 99%

Genotypic variation in soil water use and root distribution and their implications for drought tolerance in chickpea

Ramamoorthy

Krishnamurthy

Upadhyaya

et al. 2017

Functional Plant Biol.

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Abstract. Chickpeas are often grown under receding soil moisture and suffer~50% yield losses due to drought stress. The timing of soil water use is considered critical for the efficient use of water under drought and to reduce yield losses. Therefore the root growth and the soil water uptake of 12 chickpea genotypes known for contrasts in drought and rooting response were monitored throughout the growth period both under drought and optimal irrigation. Root distribution reduced in the surface and increased in the deep soil layers below 30 cm in response to drought. Soil water uptake was the maximum at 45-60 cm soil depth under drought whereas it was the maximum at shallower (15-30 and 30-45 cm) soil depths when irrigated. The total water uptake under drought was 1-fold less than optimal irrigation. The amount of water left unused remained the same across watering regimes. All the drought sensitive chickpea genotypes were inferior in root distribution and soil water uptake but the timing of water uptake varied among drought tolerant genotypes. Superiority in water uptake in most stages and the total water use determined the best adaptation. The water use at 15-30 cm soil depth ensured greater uptake from lower depths and the soil water use from 90-120 cm soil was critical for best drought adaptation. Root length density and the soil water uptake across soil depths were closely associated except at the surface or the ultimate soil depths of root presence.

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Section: Adaptation To Terminal Droughtmentioning

confidence: 99%

Genotypic variation in soil water use and root distribution and their implications for drought tolerance in chickpea

Ramamoorthy

Krishnamurthy

Upadhyaya

et al. 2017

Functional Plant Biol.

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“…Root phenes that reduce root metabolic costs including RCS, RCA, cortical cell file number, and cortical cell size reduce carbon and nutrient costs for soil exploration (Chimungu et al 2014a;Lynch et al 2014;Saengwilai et al 2014;Chimungu et al 2014b;Schneider et al 2017a). RCS is a promising breeding target for improved soil resource acquisition.…”

Section: Rcs and Nutrient Remobilizationmentioning

confidence: 99%

Functional implications of root cortical senescence for soil resource capture

Schneider

Lynch

2017

Plant Soil

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Background Root phenes play a primary role in plant adaptation to edaphic stress. Understanding the functional implications of root phenotypes will enable the development of crop varieties with improved soil resource acquisition. Root cortical senescence (RCS) is a type of programmed cell death in cortical cells of several Poaceae species. Until recently there has been very little attention to the functional implications of RCS for water and nutrient capture. Scope We explore the functional implications of RCS as an adaptive trait for water and nutrient acquisition. The present review summarizes evidence from our own studies and other published work, and provides novel insights into the fitness landscape of RCS. Progress has recently been achieved in understanding the development and physiological implications of RCS. We propose that RCS is a useful trait for water and nutrient acquisition, particularly in edaphic stress conditions. Conclusions Further research is needed to understand the utility and tradeoffs of RCS in the context of specific environments, management practices, and phenotypic backgrounds. The utility of RCS for improved plant performance under edaphic stress merits investigation in the field. RCS may be a useful breeding target for improved soil resource capture in several major crop species including wheat, barley, and triticale.

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“…BRS1010 showed the lowest number of grains per row among the genotypes under drought conditions. It is important to note that this reduction in number of grains per row in sensitive genotypes is an important variable to be (Lynch et al, 2014).…”

Section: Droughtmentioning

confidence: 99%

“…In this scenario, roots play a fundamental role, since this organ is responsible for water acquisition, and is an important component of plant adaptation to waterlimited environments (Lynch et al, 2014). According to Lavinsky et al (2015b), maize genotypes that invest carbon in roots during drought conditions are more productive, since improve water absorption and maintain higher values of stomatal and mesophyll conductance.…”

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confidence: 99%

Drought-Tolerant Maize Genotypes Invest in Root System and Maintain High Harvest Index During Water Stress

Magalhães

Alvarenga

Lavinsky

et al. 2016

RBMS

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-Drought is considered the primary limitation to agriculture and, can reduce grain yield by up to 60% when occurs at pre-flowering in maize. In this context this research, aimed to understand the maize genotypes behavior to drought management and carbon partitioning between grain production and structures to maintain hydration when submitted to drought. Maize genotypes tolerant (DKB390 and P30F35) and sensitive (BRS1010 and 2B710) to drought were grown in a greenhouse using two water conditions: irrigated and stressed. Water deficit was imposed at pre-flowering and maintained for twelve days. Leaf water potential, gaseous exchange and male and female flowering interval were evaluated. At the end of the cycle, production components and root/shoot ratio dry weight were evaluated. Drought-tolerant genotypes used root system as a mechanism of tolerance to drought, which ensure greater efficiency in absorption and loss of water and, consequently, greater stomatal conductance during the drought, compared to the sensitive-genotypes. In addition, drought-tolerant genotypes showed greater stability in the source-sink relationship, exhibiting higher photosynthetic rate and harvest index. Keywords: water stress, carbon partitioning; root/shoot ratio dry weight, gas exchanges, Zea mays. GENÓTIPOS DE MILHO TOLERANTES À SECA INVESTEM EM SISTEMA RADICULAR E MANTEM ALTO ÍNDICE DE COLHEITA DURANTE O ESTRESSE HÍDRICORESUMO-A seca é considerada restrição primária à agricultura, e no milho, quando ocorre no pré-florescimento, pode reduzir o rendimento de grãos em até 60%. Neste contexto, objetivou-se entender como genótipos de milho contrastantes para tolerância à seca, gerenciam o particionamento de carbono entre produção de grãos e estruturas de manutenção da hidratação durante a seca. Para isso, em casa de vegetação cultivaram-se genótipos de milho tolerantes (DKB390 e P30F35) e sensíveis (BRS1010 e 2B710) à seca, em duas condições hídricas: irrigado normal e déficit hídrico. No pré-florecimento foi imposto o déficit hídrico, que foi mantido por doze dias. Posteriormente avaliou-se o potencial hídrico foliar, trocas gasosas e intervalo de florescimento masculino e feminino. No final do ciclo, avaliaram-se os componentes de produção e a razão raiz/parte aérea. Constatou-se que, genótipos tolerantes utilizaram preferencialmente sistema radicular como um mecanismo de tolerância à seca, o que garantiu a esses genótipos, maior eficiência entre a absorção e perda de água e, consequentemente, maior condutância estomática durante a seca, em relação aos genótipos sensíveis. Além disso, os genótipos tolerantes apresentaram maior equilíbrio em suas relações fonte e dreno, exibindo maiores taxa fotossintética e índice de colheita. Palavras-chave: estresse hídrico, particionamento de carbono, razão raiz/parte aérea, trocas gasosas, Zea mays. Sorgo, v.15, n.3, p. 451-461, 2016 ABSTRACT -Drought is considered the primary limitation to agriculture and, can reduce grain yield by up to 60% when occurs at pre-flowering in maize. In th...

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Root anatomical phenes associated with water acquisition from drying soil: targets for crop improvement

Cited by 257 publications

References 124 publications

Genotypic variation in soil water use and root distribution and their implications for drought tolerance in chickpea

Genotypic variation in soil water use and root distribution and their implications for drought tolerance in chickpea

Functional implications of root cortical senescence for soil resource capture

Drought-Tolerant Maize Genotypes Invest in Root System and Maintain High Harvest Index During Water Stress

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