Results: 52

Leaf application of chitosan and physiological evaluation of maize hybrids contrasting for drought tolerance under water restriction

Braz. j. biol; 80 (3), 2020
Abstract It is a fact that the regions that cultivate the most maize crop do not have fully adequate technologies to measure productivity losses caused by irregularities in water availability. The objective of this study was to evaluate the physiological characteristics of maize hybrids tolerant (DKB 390...

Reconstrucción histórica de la precipitación en la Reserva de la Biosfera El Cielo, México, mediante anillos de crecimiento en Taxodium mucronatum (Cupressaceae)

Rev. biol. trop; 68 (3), 2020
Introducción: El conocimiento histórico del clima es fundamental para analizar su variabilidad en el tiempo y su impacto en los ecosistemas y poblaciones humanas. Objetivo: Analizar el crecimiento anual de los árboles de sabino, también conocido como ahuehuete (Taxodium mucronatum) del río Sabinas p...

A seca de 1877-1879 no Império do Brasil: dos ensinamentos do senador Pompeu aos de André Rebouças: trabalhadores e mercado

Resumo Na década de 1870, o Império do Brasil sancionou a Lei do Ventre Livre (1871) e impulsionou um conjunto de reformas modernizadoras. Em meio à crise do escravismo e no contexto da seca de 1877-1879, proprietários de terra e de escravos, ministros, presidentes de província e representantes do s...

Phytoplankton scenario and microcystin in water during extreme drought in semiarid tropical water supplies, Northeastern Brazil

Braz. j. biol; 80 (1), 2020
Abstract The objective of this study was to characterize the limnological, microystin and phytoplankton community of five tropical eutrophic reservoirs located in the Brazilian northeastern semi-arid region, used for domestic use at the time of extreme drought and reduction of water volume. The study was...

Genome-wide characterization of the abscisic acid-, stress- and ripening-induced (ASR) gene family in wheat (Triticum aestivum L)

Biol. Res; 53 (), 2020
BACKGROUND: Abscisic acid-, stress-, and ripening-induced (ASR) genes are a class of plant specific transcription factors (TFs), which play important roles in plant development, growth and abiotic stress responses. The wheat ASRs have not been described in genome-wide yet. METHODS: We predicted the trans...

Environmental impacts of a reduced flow stretch on hydropower plants

Braz. j. biol; 79 (3), 2019
Abstract In Brazil, given its privileged hydrology, the unexplored economic use of water resources has many dimensions, such as hydroelectric power. This energy will face increasingly rigorous social and environmental impact assessments (40% of potential is located in the Amazon region). Hydropower inve...

Physiological response of seeds of peanut genotypes to water deficiency

Biosci. j. (Online); 35 (3), 2019
Among the factors that may influence the germination process of seeds, water deficiency is considered the most important. The present study aims to evaluate the physiological response of peanut genotypes to water deficiency. The experiment was conducted in a completely randomize...

Characterization of the transcriptional profiles in common buckwheat (Fagopyrum esculentum) under PEG-mediated drought stress

BACKGROUND: Common buckwheat (Fagopyrum esculentum) is an important staple food crop in southwest China, where drought stress is one of the largest limiting factors that lead to decreased crop production. To reveal the molecular mechanism of common buckwheat in response to drought stress, we performed a ...

Microbialite-like structures in Cladophora sp. (Ulvophyceae) mats from a subtropical Andean basin: ecological implications

Rev. biol. trop; 67 (1), 2019
Abstract The solubility equilibrium of calcite is influenced by physicochemical, climatic and biological factors. Annual cycles of exceptionally prolonged drought, in conjunction with naturally occurring diffuse organic pollution, generate the unique conditions for the precipitation of lithified carbonat...

Relative efficacy of organic substrates on maize root proliferation under water stress

Biosci. j. (Online); 35 (1), 2019
The aggravating threat for today’s agriculture is provision of food security to ever-escalating population utilizing scarce resources. Water scarcity is restraining humans to produce more from drops of water in place of gallons. Root is present at soil-plant interface and is main ...