Cultivares de trigo submetidas a déficit hídrico no início do florescimento, em casa de vegetação

Santos, Diego dos; Guimarães, Vandeir Francisco; Klein, Jeferson; Fioreze, Samuel Luiz; Júnior, Eurides Kuster Macedo

doi:10.1590/s1415-43662012000800004

Cited by 17 publications

(14 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In other grasses there are reports that the RWC gradually decreases, as shown in wheat (Santos et al, 2012) and barley (Thameur et al, 2012), attributed to the improvement process (Sherrard et al 2009;Souza et al 2014), being the photosynthetic rate, stomatal conductance and transpiration, changes that firstly respond to water deficiency.Stomatal conductance presents variation more rapidly with the reduction of water available in the soil, as observed in several studies independent from the photosynthetic physiology of plants, reported for C 3 (Santos et al, 2012;Yousfi et al, 2012;Fernandes et al, 2015) and C 4 plants (Hu et al, 2010;(Mattos et al, 2005;Hu et al, 2010;Zhou et al, 2013). In the present study, this condition also occurs being observed the reduction of gs (Fig.3a).…”

Section: Discussionmentioning

confidence: 99%

Physiological responses of Urochloa ruziziensis inoculated with Azospirillum brasilense to severe drought and rehydration conditions

Bulegon¹,

Battistus²,

Guimarães³

et al. 2017

Aust J Crop Sci

View full text Add to dashboard Cite

This study evaluated the tolerance of U. ruziziensis under severe water stress conditions and its recovery when rehydrated, based in responses of relative leaf water content and gas exchange of the crop. The experiment was conducted in green house in Oxisol. The experimental design was a randomized block design, totaling five treatments, was represented by inoculation of A. brasilense strains AbV5 + AbV6, as follow: seed inoculation, foliar spray application, seed inoculation + foliar spray application, a non-inoculated control with water deficit treatment and a irrigated control without inoculation. Drought was imposed 45 days after sowing, after the vessel was irrigated until saturation of the substrate, by total removal of irrigation for six days, and evaluated three days after the resumption of water, evaluating gravimetric soil moisture, relative leaf water content and gas exchange. Soil moisture showed non variation to treatments non irrigated, but the relative leaf water content was lower in the control without water. The control and the treatment inoculated with A. brasilense in seeds exhibited lower rates of gas exchange. Recovery full of photosynthetic activity occurred three days after rehydration in all treatments. A. brasilense foliar sprayed is efficient to increase the tolerance of U. ruziziensis to water deficit and presented higher photosynthetic rates even under conditions of severe water deficit.

show abstract

Section: Discussionmentioning

confidence: 99%

Physiological responses of Urochloa ruziziensis inoculated with Azospirillum brasilense to severe drought and rehydration conditions

Bulegon¹,

Battistus²,

Guimarães³

et al. 2017

Aust J Crop Sci

View full text Add to dashboard Cite

show abstract

“…Além de elevados índices pluviométricos, a cultura precisa de uma boa distribuição durante o ciclo para alcançar altas produtividades (Brunetta et al, 2006). A perda de água do tecido da planta de trigo produz efeitos negativos, como a diminuição do rendimento, e pode interferir no número de grãos por área e no número de grãos por espiga (Santos et al, 2012).…”

Section: Resultsunclassified

Aplicação foliar de aminoácidos como suplemento à adubação nitrogenada em cultivares de trigo

Gazola¹,

Zucareli²,

Silva³

2017

Científica

View full text Add to dashboard Cite

ResumoO manejo da adubação nitrogenada é complexo e dependente das condições edafoclimáticas. A incorporação de aminoácidos via foliar pode suplementar o fornecimento de Nem em determinados estádios de desenvolvimento da planta. O objetivo foi estudar os efeitos da aplicação foliar tardia de aminoácidos nas características agronô-micas e no desempenho produtivo de cultivares de trigo. O experimento foi conduzido em Londrina-PR, sob delineamento experimental de blocos ao acaso, em parcelas subdivididas, em esquema fatorial 4x4, com quatro repetições. Foram avaliadas quatro doses do resíduo agroindustrial à base de aminoácidos (0, 10, 20, 30 L ha -1 ), aplicadas na fase de emborrachamento da planta, em quatro cultivares de trigo (IPR Catuara, BRS Gaivota, Quartzo e CD 120). A adubação de cobertura consistiu em 60 kg ha -1 de nitrogênio aplicada na fase de perfilhamento, na forma de ureia. As variáveis analisadas foram: índice de cor verde da folha, altura de plantas, número de espigas por metro quadrado, número de espiguetas por espiga, número de grãos por espiga, número de grãos por espigueta, massa de mil grãos e produtividade de grãos. O resíduo agroindustrial à base de aminoácidos aplicado via foliar não alterou o desempenho produtivo das cultivares de trigo Catuara, Gaivota e Quartzo. Para a cultivar CD 120, o aumento das doses de aminoácidos aplicadas na fase de emborrachamento das plantas aumentou o número de grãos por área, sem alterar o rendimento de grãos.Palavras-chave adicionais: componentes de produção; nitrogênio; nutrição de plantas; Triticum aestivum. AbstractThe management of nitrogen fertilization and the recommendation is difficult because of the multiplicity of chemical and biological reactions of nitrogen, soil and climatic conditions of dependency, vulnerability to loss by leaching, volatilization, denitrification and erosion, and immobilization of biological processes. The incorporation of additional amino acids foliar can supply certain stages of plant development. Thus, the objective was to study the effects of foliar application of amino acids in late agronomic and yield performance of wheat cultivars. The experiment was conducted in Londrina, PR. The experimental design was randomized blocks in split plots with 4 replications in a factorial 4x4. We evaluated four doses of agro industrial based on amino acid, (0, 10, 20, 30 L ha -1 ), applied at the stage of booting in four wheat cultivars (IPR Catuara, BRS Seagull, Quartz and CD 120). The variables analyzed were: leaf chlorophyll content, plant height, number of ears per square meter, number of spikelets per spike, number of grains per spike, number of grains per spikelet, thousand grain weight and yield. The amino acid based product applied foliar did not alter the yield performance of wheat cultivars Catuara, Seagull and Quartz. To cultivate CD 120 increased doses of amino acid foliar applied at the stage of booting increases the number of grains per area without changing the yield. Cultivar Quartz resulted in performance compared aga...

show abstract

“…Stomatal closure is considered a defense against drought, being important for stomatal control, as emphasized by Santos et al (2012), with the aim of fighting leaf dehydration, as it is one of the first adjustments developed by plants to prevent continue water loss. Loss of turgidity due to water stress causes stomatal closure, reducing photosynthesis and breathing, interfering with many basic metabolic processes; it is thus a mechanism created to interrupt continue water loss to the external environment.…”

Section: Resultsmentioning

confidence: 99%

Efeito responsivo de mudas de paricá ao estresse hídrico

Duarte¹,

Rocha²,

Lima³

et al. 2016

View full text Add to dashboard Cite

The present study objective was identifying mechanisms of response to water deficit of paricá seedlings. The experiment was conducted in a greenhouse, in 8-liter pots, with substrate consisting of soil (dystrophic RedYellow Latosol), in randomized block design, with five different irrigations based on the evapotranspiration of the plants (20, 40, 60, 80 and 100%), with six replications. The plants were irrigated daily, with a water volume corresponding to 100% of the evapotranspired water, and, at 90 days after germination, subjected to ten days of water deficit, after that irrigated during ten days with the different percentages of evapotranspiration, then evaluated. The following variables were measured: number of leaves (NL), plant height (PH), stem diameter (SD), total biomass (TB), total daily transpiration (TDT), total chlorophyll (TC), carotenoids (CAR), root mass ratio (RMR), leaf mass ratio (LMR) stem mass ratio (SMR). Concluded that paricá seedlings response to water deficit with slowing down of dehydration, with reduction of content of carotenoids and increase in root volume. As a consequence of water stress, they reduce the number of leaves, stem diameter, plant height, and, of course, total biomass, aiming at maintaining the internal water, indicating low ability to tolerate stress.

show abstract

Cultivares de trigo submetidas a déficit hídrico no início do florescimento, em casa de vegetação

Cited by 17 publications

References 18 publications

Physiological responses of Urochloa ruziziensis inoculated with Azospirillum brasilense to severe drought and rehydration conditions

Physiological responses of Urochloa ruziziensis inoculated with Azospirillum brasilense to severe drought and rehydration conditions

Aplicação foliar de aminoácidos como suplemento à adubação nitrogenada em cultivares de trigo

Efeito responsivo de mudas de paricá ao estresse hídrico

Contact Info

Product

Resources

About