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Registros recuperados: 9
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Biochemical components and dry matter of lemon and mandarin hybrids under salt stress AGRIAMBI
Sá,Francisco V. da S.; Brito,Marcos E. B.; Figueiredo,Lizaiane C. de; Melo,Alberto S. de; Silva,Luderlândio de A.; Moreira,Rômulo C. L..
ABSTRACT The objective was to study the biochemical changes and dry matter content in lemon and mandarin hybrids under salt stress during rootstock formation. For this, a study was conducted in randomized complete block, using a 2 x 5 factorial scheme, with two salinity levels (0.3 and 4.0 dS m-1) applied in five citrus rootstock genotypes (1. TSKC x CTARG - 019; 2. LRF; 3. TSKC x (LCR x TR) - 040; 4. LCRSTC and 5. LVK), with three replicates and four plants per plot. At 90 days after sowing, saline treatments started to be applied and continued until 120 days after sowing, the moment in which the plants were collected for evaluation of biochemical characteristics and phytomass accumulation. The increase in water salinity negatively affected the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Citrus spp.; Salinity; Chlorophyll and carotenoids; Water status.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000400249
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Enzymatic antioxidant responses to biostimulants in maize and soybean subjected to drought Scientia Agricola
Vasconcelos,Ana Carolina Feitosa de; Zhang,Xunzhong; Ervin,Erik H.; Kiehl,Jorge de Castro.
Water stress is one of the most important environmental factors inducing physiological changes in plants, such as decrease in the water potential of the cells, the stomatal closure; and the development of oxidative processes mediated by reactive oxygen species (ROS). Antioxidant enzymes superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX) are efficient scavengers of ROS. The aim of this research was to examine how the application of biostimulant based on humic substances and aminoacids may affect activity levels of SOD, CAT, and APX of maize and soybean plants under well-watered or drought stress conditions. Pots (4.5 L) were filled with a Typic Hapludult soil where the biostimulants doses were applied. It was taken leaf samples in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Superoxide dismutase; Catalase; Ascorbate peroxidase; Water status.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300015
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Physiological response of Cucurbita pepo var. pepo mycorrhized by Sonoran desert native arbuscular fungi to drought and salinity stresses BJM
Harris-Valle,Citlalli; Esqueda,Martín; Gutiérrez,Aldo; Castellanos,Alejandro E.; Gardea,Alfonso A.; Berbara,Ricardo.
ABSTRACT Plants response to symbiosis with arbuscular mycorrhizal fungi (AMF) under water stress is important to agriculture. Under abiotic stress conditions native fungi are more effective than exotics in improving plant growth and water status. Mycorrhization efficiency is related to soil fungi development and energy cost-benefit ratio. In this study, we assessed the effect on growth, water status and energy metabolism of Cucurbita pepo var. pepo when inoculated with native AMF from the Sonoran desert Mexico (mixed isolate and field consortium), and compared with an exotic species from a temperate region, under drought, low and high salinity conditions. Dry weights, leaf water content, water and osmotic potentials, construction costs, photochemistry and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glomus; Pacispora; Water status; Construction cost; Photosynthesis.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000100045
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TVDI spatiotemporal pattern of a soybean growing area in humid subtropical climate Bragantia
Schirmbeck,Lucimara Wolfarth; Fontana,Denise Cybis; Schirmbeck,Juliano.
ABSTRACT The most southern Brazilian state, Rio Grande do Sul, is characterized by high crop yield and is, currently, the third leading soybean producer in the country. Therefore, agriculture is very important to the economy of the region. Because agriculture is highly dependent on variable weather parameters, the present study aimed to test the Temperature-Vegetation Dryness Index (TVDI) as a regional indicator of water status under the climate and soybean crop management conditions that predominate in northwestern Rio Grande do Sul. For this, soybean crop seasons with contrasting yields were selected: 2004 – 2005 (yield 0.5 t∙ha–1) and 2009 – 2010 (2.7 t∙ha–1). TVDI was obtained from the surface temperature (TS) and Normalized Difference Vegetation Index...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Water status; NDVI; Surface temperature.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000300447
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Two approaches to calculate TVDI in humid subtropical climate of southern Brazil Scientia Agricola
Schirmbeck,Lucimara Wolfarth; Fontana,Denise Cybis; Schirmbeck,Juliano.
ABSTRACT: Soybean crops occupy most areas in Rio Grande do Sul State and are highly dependent on rainfall since most of them are non-irrigated. Rainfall during the harvest period is often insufficient to meet the water demand, making water indicators an important tool for the crops. This study compared two approaches in the parameterization process of TVDI (Temperature-Vegetation Dryness Index) in a subtropical climate region of Brazil. The process used Moderate Resolution Imaging Spectroradiometer (MODIS) images of the surface temperature (TS) and Normalized Difference Vegetation Index (NDVI), with spatial resolutions of 1,000 m and periods of 8-16 d, respectively. The evaporative triangles for the TS/NDVI scatter plots were built either for each image...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Parameterization; Soybean; Water status; Satellite imagery.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000200111
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Upland rice: phenotypic diversity for drought tolerance. Repositório Alice
LANNA, A. C.; COELHO, G. R. C.; MOREIRA, A. S.; TERRA, T. G. R.; BRONDANI, C.; SARAIVA, G. R.; LEMOS, F. da S.; GUIMARÃES, P. H. R.; MORAIS JÚNIOR, O. P.; VIANELLO, R. P..
Upland rice is cultivated mostly in Latin America and Africa by small farmers and in areas with risk of dry spells. This study evaluated morphophysiological mechanisms of upland rice associated to drought adaptation. A set of 25 upland rice genotypes were grown in a plant phenotyping platform during 2015 and 2017 under regular irrigation and water restriction. We evaluated morphophysiological traits in shoots (vegetative structures growth, gas exchange, water use efficiency, carboxylation efficiency, water status) and roots (length, surface area, volume and diameter), as well as agronomic traits (grain yield and its components). There was a reduction in grain yield by up to 54 % and 58 % in 2015 and 2017, respectively, under water deficit. Five upland rice...
Tipo: Artigo de periódico Palavras-chave: Water status; Arroz; Oryza Sativa; Resistência a Seca; Seleção Fenótipa; Rice; Grain yield; Gas exchange; Root systems; Vegetative growth.
Ano: 2020 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1126397
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Upland rice: phenotypic diversity for drought tolerance Scientia Agricola
Lanna,Anna Cristina; Coelho,Gesimária Ribeiro Costa; Moreira,Alécio Souza; Terra,Thiago Gledson Rios; Brondani,Claudio; Saraiva,Gabriel Rios; Lemos,Frederico da Silva; Guimarães,Paulo Henrique Ramos; Morais Júnior,Odilon Peixoto; Vianello,Rosana Pereira.
ABSTRACT: Upland rice is cultivated mostly in Latin America and Africa by small farmers and in areas with risk of dry spells. This study evaluated morphophysiological mechanisms of upland rice associated to drought adaptation. A set of 25 upland rice genotypes were grown in a plant phenotyping platform during 2015 and 2017 under regular irrigation and water restriction. We evaluated morphophysiological traits in shoots (vegetative structures growth, gas exchange, water use efficiency, carboxylation efficiency, water status) and roots (length, surface area, volume and diameter), as well as agronomic traits (grain yield and its components). There was a reduction in grain yield by up to 54 % and 58 % in 2015 and 2017, respectively, under water deficit. Five...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Grain yield; Gas exchange; Water status; Root system; Vegetative morphology.
Ano: 2021 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000500603
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Water potential in peach branches as a function of soil water storage and evaporative demand of the atmosphere Rev. Bras. Frutic.
Monteiro,Alex Becker; Reisser Júnior,Carlos; Romano,Luciano Recart; Timm,Luís Carlos; Toebe,Marcos.
Abstract The use of water potential indicators in the plant has been adopted in irrigation management, in recent years, since it is accepted that the plant is the best indicator of its own water status. The objective of this study was to verify the relationship between water potential in peach tree branches and the evaporative demand of the atmosphere and the water availability in two textural classes of an Aquertic Hapludalf soil, aiming to adopt irrigation management strategies based on the water potential in the plant. Research was carried out in a commercial peach orchard, cv. Esmeralda, in the municipality of Morro Redondo-Rio Grande do Sul state, Brazil. Four peach tree rows were evaluated, being two irrigated and two non irrigated. The irrigation...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Prunus persica (L.); Water status; Evapotranspiration; Soil water content; Irrigation management.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452018000100702
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Water relations in seed biology Scientia Agricola
Villela,F. A..
The water relations play a fundamental role in seed biology. Thus, the purpose of the present paper was to analyze the performance of water status in seed development and germination. The researches have suggested that the water potential of the seed or seed structures provides a better indicator of the seed water status than water content. The seed water status plays a regulatory role in seed development and germination.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Water status; Hydration levels; Water potential.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500018
Registros recuperados: 9
Primeira ... 1 ... Última
 

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