Relationship Between Nitric Oxide, Enzymatic Antioxidant System And Aba In Maize Under Long-Term Drought

Magalhães, P. C.; Lavinsky, A. O.; Melo, Hidelblandi F. de; Alves, J.C.; Souza, T. C. de; Barbosa, Antenor Pereira; Ribeiro, Cléberson

doi:10.18512/1980-6477/rbms.v14n2p155-166

Cited by 3 publications

(3 citation statements)

References 21 publications

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“…Sensitive genotypes showed a reduction in gas exchange parameters when compared to tolerant ones in drought conditions. On the other hand, tolerant genotypes showed greater ability to manage absorption and loss of water, ensuring greater stomatal conductance and consequently improvements in carbon sequestration (Souza et al, 2013;Magalhães et al, 2015). In addition, Lavinsky This can be due to the reduction in photosynthesis and subsequent low energy levels that cause grain abortion.…”

Section: Discussionmentioning

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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Section: Discussionmentioning

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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“…The maize genotypes DKB 390 and BRS 1010 present contrasting yield traits in relation to water deficit (Souza et al, 2013a(Souza et al, , 2013bLavinsky et al, 2015;Magalhães et al, 2015;Avila et al, 2016), including grain yield and yield gain (Table 1). The seeds for these maize genotypes were made available by the National Maize and Sorghum Research Center, EMBRAPA -Sete Lagoas MG, Brazil.…”

Section: Plant Materialsmentioning

confidence: 99%

Yield-related phenotypic traits of drought resistant maize genotypes

Pires

Castro

Freitas

et al. 2020

Environmental and Experimental Botany

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“…The experiments were carried out in a greenhouse at the Biology Department of the Federal University of Lavras, Lavras, Minas Gerais, Brazil (21°14ʹ43ʹʹS, 45°59ʹ59ʹʹW). Two maize (Zea may L.) genotypes were used in these experiments: DKB390 reported as drought-tolerant (Souza et al 2013) and BRS1010 described as drought-sensitive (Magalhães et al 2015). Seeds obtained from the National Maize and Sorghum Research Center, Sete Lagoas, Minas Gerais, Brazil were sown in plastic trays containing 4 000 cm 3 of Vermiculite irrigated to field capacity and grown in a chamber maintained at room temperature and constant irradiance of 84 mol m -2 s -1 .…”

Section: Plants and Experimental Designmentioning

confidence: 99%

Aerenchyma development in different root zones of maize genotypes under water limitation and different phosphorus nutrition

et al. 2018

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Root cortical aerenchyma (RCA) is suggested to reduce metabolic cost for root growth, but it might lower water uptake by plants. The objective of this work was to evaluate the effects of drought and phosphorus on the RCA development along the root axis and to elucidate its role in water stress tolerance of two maize genotypes. Plants of drought-tolerant DKB390 and drought-sensitive BRS1010 genotypes were grown in Vermiculite at field capacity of 100, 75, 50, and 25 % and supplied with 0.1, 0.4, and 0.8 mM phosphorus. Growth parameters, RCA, and plant P content were evaluated for all plants. Higher RCA development was observed in DKB390 than in BRS1010. Drought reduced the percentage of RCA in the root-hair zone of both genotypes but increased its development in the root maturation zone. Phosphorus limitation enhanced RCA development only in the DKB390. Under drought stress, DKB390 showed resilient growth whereas growth was inhibited in BRS1010. Higher root P content was related to its higher supply. Therefore, RCA formation was induced either by drought or by phosphorus limitation, while no interaction was evident. The RCA development varied along the root axis in order to balance water and phosphorus uptake and the drought response was genotype dependent.

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Relationship Between Nitric Oxide, Enzymatic Antioxidant System And Aba In Maize Under Long-Term Drought

Cited by 3 publications

References 21 publications

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

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

Yield-related phenotypic traits of drought resistant maize genotypes

Aerenchyma development in different root zones of maize genotypes under water limitation and different phosphorus nutrition

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