Reduced Root Cortical Cell File Number Improves Drought Tolerance in Maize

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

doi:10.1104/pp.114.249037

Cited by 175 publications

(169 citation statements)

References 67 publications

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“…Chimungu et al (2014) and Jaramillo et al (2013) reported that larger cells of the root cortical parenchyma reduce cellular respiration in this region, contributing to the deepening of the root system due to a lower metabolic cost, and that corn plants with lower cortex have higher drought tolerance, due to the smaller number of cell rows. Aerenchyma in corn roots may have the function of supporting a greater soil and water acquisition, since these structures decrease the metabolic cost of growing roots because of the reduced presence of cells in respiration (Zhu et al, 2010;Souza et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

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Corn root morphoanatomy at different development stages and yield under water stress

Souza

Magalhães

Castro

et al. 2016

Pesq. agropec. bras.

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-The objective of this work was to characterize the morphoanatomy of roots and the yield traits of two corn hybrids contrasting for drought tolerance (DKB 390, tolerant; and BRS 1030, sensitive), at different stages of development. Water deficit was imposed for ten days, in a greenhouse, at three growth stages: V5, VT, and R3. These treatments were combined to generate cumulative stress during the plant cycle, as: V5VT, V5R3, VTR3, and V5VTR3. The following were analyzed: root anatomy; proportion of aerenchyma in the cortex; metaxylem number and diameter; phloem thickness; as well as morphological characteristics, such as root length, volume, and surface area, specific root length, length of fine roots, grain yield, and ear length and diameter. Development stage affected the responses to stress: DKB 390 showed the best performance for root morphoanatomy and yield traits, under drought stress, at the reproductive stages, mainly R3, and in the treatments with cumulative stress, especially V5VTR3; whereas BRS 1030 presented higher means for the studied parameters, mainly at the V5 and VT stages, but did not show a higher grain yield under water stress. The greater tolerance of the DKB 390 hybrid to water deficit is probably linked with a memory of pre-exposure to water stress at different growth stages.Index terms: Zea mays, aerenchyma, drought, endoderm, specific root length, WinRhizo. Morfoanatomia radicular em diferentes estádios de desenvolvimento e produtividade do milho sob estresse hídricoResumo -O objetivo deste trabalho foi caracterizar a morfoanatomia radicular e os atributos de rendimento de dois híbridos de milho contrastantes quanto à seca (DKB 390, tolerante; e BRS 1030, sensível), em diferentes estádios de desenvolvimento. A deficiência hídrica foi imposta por dez dias, em casa de vegetação, em três estádios de desenvolvimento: V5, VT e R3. Esses tratamentos foram combinados para gerar estresses acumulativos durante o ciclo da planta, como: V5VT, V5R3, VTR3 e V5VTR3. Foram analisados: anatomia radicular; proporção de aerênquima no cortex; número e diâmetro de metaxilema; espessura do floema; bem como características morfológicas, como comprimento, volume e área de superfície radicular, comprimento específico das raízes, comprimento de raízes finas, rendimento de grãos, e comprimento e diâmetro da espiga. O estádio de desenvolvimento influenciou as respostas ao estresse: DKB 390 apresentou o melhor desempenho quanto à morfoanatomia radicular e aos atributos de rendimento, quando submetido a estresse hídrico, nos estádios reprodutivos, sobretudo em R3, e nos tratamentos acumulativos de estresse, principalmente no V5VTR3; enquanto BRS 1030 apresentou as maiores médias para os parâmetros estudados, principalmente nos estádios V5 e VT, mas não apresentou maior rendimento de grãos sob estresse hídrico. A maior tolerância do híbrido DKB 390 ao estresse hídrico provavelmente relaciona-se à memória de exposição prévia ao estresse hídrico em diferentes estádios de desenvolvimento.Termos para indexação...

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Section: Resultsmentioning

confidence: 99%

“…For BRS 1030, the highest length was found when stress imposition occurred at the V5, VT, and R3 stages. Chimungu et al (2014), while evaluating tolerant corn genotypes in a greenhouse, reported higher specific root length at early stages (seedlings).…”

Section: Resultsmentioning

confidence: 99%

Corn root morphoanatomy at different development stages and yield under water stress

Souza

Magalhães

Castro

et al. 2016

Pesq. agropec. bras.

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“…Root cortical phenes are important for plant performance, particularly under edaphic stress (Zhu et al 2010;Chimungu et al 2014a;Chimungu et al 2014b;Saengwilai et al 2014;Schneider et al 2017b). 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).…”

Section: Rcs and Nutrient Remobilizationmentioning

confidence: 99%

“…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%

“…For example, the development of root cortical aerenchyma (RCA) in maize improves plant performance in environments with suboptimal nutrient and water availability (Zhu et al 2010;Postma and Lynch 2011a, b;Jaramillo et al 2013;Saengwilai et al 2014;Chimungu et al 2015), an effect which modeling studies show can be attributed to a reduction in root metabolic costs (Postma et al 2014;Dathe et al 2016). Fewer cell files or greater cell size in the root cortex of maize substantially reduces root respiration and improves soil exploration and water acquisition in conditions of suboptimal water availability (Chimungu et al 2014a(Chimungu et al , 2014b. Recently, root cortical senescence (RCS), a phene anatomically distinct from RCA, has also been identified as a root phene that reduces root metabolic costs, thereby improving plant growth under suboptimal nutrient availability.…”

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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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Drought stress and morphophysiological responses in plants

Shahzad

Jan

Afzal

et al. 2016

Water Stress and Crop Plants

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Reduced Root Cortical Cell File Number Improves Drought Tolerance in Maize

Cited by 175 publications

References 67 publications

Corn root morphoanatomy at different development stages and yield under water stress

Corn root morphoanatomy at different development stages and yield under water stress

Functional implications of root cortical senescence for soil resource capture

Drought stress and morphophysiological responses in plants

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