Estresse por deficiência hídrica em genótipos de Brachiaria brizantha

Pezzopane, C. de G.; Santos, P. M.; Cruz, Pedro Gomes da; Altoé, J.; Ribeiro, Felipe; Valle, Cacilda Borges do

doi:10.1590/0103-8478cr20130915

Cited by 33 publications

(38 citation statements)

References 8 publications

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“…However, Pezzopane et al. () did not evaluate plant recovery after water deficit, and water restriction was applied just for 7 days. Beloni et al.…”

Section: Discussionmentioning

confidence: 99%

“…In general, plant recovery after a period of water deficit and drought survival has been poorly characterized by previous experiments with tropical forage grasses (Beloni et al, 2017). In a pot experiment, Pezzopane et al (2015) observed that cv. Marandu and cv.…”

Section: Urochloa Cultivars Under Severe Droughtmentioning

confidence: 99%

“…BRS Paiaguás had similar responses to a short water-deficit period, both reducing leaf areas, leaf elongation rates and dry biomass production. However, Pezzopane et al (2015) did not evaluate plant recovery after water deficit, and water restriction was applied just F I G U R E 3 (a)-Leaf water potential (LWP) and (b)-Leaf relative water content (LRWC) for the four cultivars after drought imposition in pots as a function of declining soil water content F I G U R E 4 Relative growth postdrought (relative growth after water stress compared with irrigated control) at three levels of final soil water content (SWC): moderate (above 10%), low (from 8.5% to 10%), and very low (below 8.5%) in 7-L pots before rehydration for the four cultivars studied for 7 days. Beloni et al (2017) also observed a low tiller survival rate of cv.…”

Section: Urochloa Cultivars Under Severe Droughtmentioning

confidence: 99%

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Large variability in drought survival among Urochloa spp. cultivars

Beloni

Santos

Rovadoscki

et al. 2018

Grass and Forage Science

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The Urochloa spp. cultivars are largely used for forage production in tropical and humid subtropical zones in Brazil. However, in areas of transition to drier zones, the persistence of Urochloa cultivars may be jeopardized by severe drought. We aimed to quantify and describe variability in growth potential under irrigation as well as dehydration tolerance and avoidance in cultivars under severe drought of Urochloa C4 species (Urochloa brizantha, cvs. Marandu and BRS Paiaguás and Urochloa decumbens cv. Basilisk), which were hypothesized to be less dehydration tolerant than a Mediterranean C3 species (Dactylis glomerata L. cv. Medly). Two experiments were carried out in a controlled environment—one in pots and one in long tubes—each under irrigation and drought successively. Marandu and Basilisk cultivars produced double the aerial and root biomass of cv. BRS Paiaguás. Their root systems were also deeper conferring them higher dehydration avoidance; however, they exhibited lower dehydration tolerance under severe drought. Conversely, cv. BRS Paiaguás was less productive, more dehydration tolerant and, therefore, able to survive at lower soil moisture, similar to the drought tolerant cv. Medly. The BRS Paiaguás cultivar may show sward persistence where extreme drought is experienced, but results should be confirmed under field conditions.

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“…However, Pezzopane et al. () did not evaluate plant recovery after water deficit, and water restriction was applied just for 7 days. Beloni et al.…”

Section: Discussionmentioning

confidence: 99%

Section: Urochloa Cultivars Under Severe Droughtmentioning

confidence: 99%

Section: Urochloa Cultivars Under Severe Droughtmentioning

confidence: 99%

See 1 more Smart Citation

Large variability in drought survival among Urochloa spp. cultivars

Beloni

Santos

Rovadoscki

et al. 2018

Grass and Forage Science

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“…In the three cuts, there was a lower dry mass of leaves of the grass when subjected to water tensions above 50 kPa that confer low soil moisture. The research found that low soil moisture caused a lower production and could cause the death of the plants (Pezzopane et al, 2014). These authors verified a reduction of 50% in the dry mass of leaves of BRS Paiaguás subjected to water stress.…”

Section: Dry Mass Of Leavesmentioning

confidence: 76%

“…In cultivar analysis of U. brizantha, researchers found lower yield of dry mass of stems in plants cultivated under water deficit (50 kPa) (Kroth et al, 2015). Similarly, Pezzopane et al (2014), obtained a reduction of the dry mass of stems of the Paiaguás grass in conditions of water stress.…”

Section: Dry Mass Of Stemsmentioning

confidence: 96%

Wood ash and water availability in the production of Paiaguás-grass

et al. 2019

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This study evaluated the production of Paiaguás grass (Urochloa brizantha) as a function of wood-ash doses and water availability in the Cerrado Oxisol. The experiment was carried out in a greenhouse with a randomized block design in a fractioned 5x5 factorial scheme, corresponding to five wood-ash doses (0; 8; 16; 24 and 32 g dm-3) and five soil water-availability scenarios (4; 8; 16; 32; 64 kPa) with four repetitions. The experimental design was based on the modified central compound and consisted of 13 treatments of wood-ash doses (g dm-3) and soil water-availability scenarios (kPa): 0-4; 0-16; 0-64; 8-8; 8-32; 16-4; 16-16; 16-64; 24-8; 24-32; 32-4; 32-16; 32-64. Soil volumetric moisture was monitored daily by means of the Diviner 2000 Capacitance Probe® for soil water replenishment according to the treatments. In 30-day intervals, three cuts were performed in the aerial part of the plants evaluating dry mass of leaves, stems, aerial part, number of leaves and of tillers. Data were subjected to analysis of variance and when significant to regression analysis, both up to 5% of error probability, through the statistical program SISVAR and response surface study using SAS. The combinations of wood ash doses with water soil tensions influence the productive characteristics of Paiaguás grass. Fertilization with wood ash reduces the effect of water stress on Paiaguás grass and this residue may be a viable alternative to partial replacement of mineral fertilization and safe disposal in the environment.

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Biochemical modulations in açaí palm (Euterpe oleracea Mart.) under vegetative stages in an agroforestry system of the Amazon

Sousa

Viégas

Galvão

et al. 2020

J. Plant Nutr. Soil Sci.

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Background: The açaí palm (Euterpe oleracea Mart.) is a species native to the Amazon region, where the largest stock of these palms is located in the state of Pará, Brazil. This species occurs predominantly spontaneously in the plateau and plains areas of the Amazonian estuary. Water deficit is the main limiting factor of plants, negatively regulating the growth, metabolism and productivity of crops. Aim: This study aimed to deepen the ecophysiological and biochemical responses of Euterpe oleracea Mart. to a water deficiency condition in agroforestry systems. Methods: The study was carried out in a defined period of lowest rainfall in the region, which runs from July to October, averaging 58.6 mm for those months, such as location, age, uniformity, health, development, height and diameter of the stipe, in order to determine the biochemical variables. Responses to biochemical components under water deficit such as starch, sucrose and carbohydrates increased for rachis and fruits. Results: The concentrations of ammonia and proteins increased in stems and fruits. For amino acids, the structures that accumulated these organic compounds were fruits and arrow. One of the most representative amino acids against water deficiency is proline, and its increase in plant tissues is due to osmoprotein function, especially for structures such as rachis, fruit and petioles + rachis. Conclusions: Therefore, Euterpe oleracea Mart. presents excellent physiological plasticity to deal with stressful conditions as well as adaptive behavior to overcome this deficiency.

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Estresse por deficiência hídrica em genótipos de Brachiaria brizantha

Abstract: RESUMO O experimento foi desenvolvido em casa de vegetação na Embrapa Pecuária Sudeste, utilizando acessos de

Cited by 33 publications

References 8 publications

Large variability in drought survival among Urochloa spp. cultivars

Large variability in drought survival among Urochloa spp. cultivars

Wood ash and water availability in the production of Paiaguás-grass

Biochemical modulations in açaí palm (Euterpe oleracea Mart.) under vegetative stages in an agroforestry system of the Amazon

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