A cultura do sorgo forrageiro vem apresentando um enorme crescimento nos últimos anos, devido ao grande potencial produtivo e forrageiro. Paralelo ao seu crescimento há também um aumento na demanda ...por herbicidas que viabilizam sua produção. Neste sentido, objetivou-se avaliar a eficiência do uso de herbicidas no controle de plantas daninhas e sua influência nas características de crescimento e produção do sorgo forrageiro. O experimento foi conduzido em delineamento de blocos casualizados, com 4 repetições e 9 tratamentos Testemunha; Capinado; 2,4-D (100%); 2,4-D (150%); Pendimetalina (100%); Pendimetalina (150%); 2,4-D (100%) + Pendimetalina (150%); 2,4-D (150%) + Pendimetalina (100%); 2,4-D (150%) + Pendimetalina (150%) aplicados aos 15 dias após a semeadura. Foram analisadas as seguintes variáveis: altura de plantas, diâmetro do caule, número de folhas, controle de plantas daninhas, fitotoxidade e produtividade. Os dados foram submetidos a análise de variância usando o software Sisvar. Para os dados qualitativos, utilizou-se o teste de Scott-Knott a 5% de probabilidade e para os dados quantitativos, regressão polinomial. O uso dos herbicidas isolados ou em associação, influenciou nas variáveis produtivas da cultura do sorgo. Os herbicidas 2,4-D (100%) e Pendimetalina (100%) se mostraram com potencial para utilização na cultura do sorgo.
A cana-de-açúcar, importante cultura agrícola a nível mundial, é uma espécie de gramínea com boa adaptação a diferentes climas, e matéria-prima base para diversos produtos, com destaque para o etanol ...e açúcar. No estado da Paraíba, alguns municípios são historicamente ligados ao cultivo e beneficiamento dessa cultura, como, por exemplo, Alagoa Nova, no Brejo Paraibano. Nesse sentido, esse estudo objetivou avaliar a dinâmica produtiva dessa cultura da cana-de-açúcar nesse município, no período de 2000 – 2020. Utilizou-se como fonte de dados o banco de informações da Pesquisa Agrícola Municipal do Instituto Brasileiro de Geografia e Estatística (IBGE). Por meio do Sistema de Recuperação Automática (SIDRA), foram extraídos os dados relativos à área plantada, área colhida, quantidade produzida, rendimento médio e valor da produção dessa cultura em Alagoa Nova. Os resultados evidenciaram elevada variabilidade temporal na produção de cana-de-açúcar em Alagoa Nova, com uma tendência de aumento e recuperação da área plantada e colhida com essa cultura. Ainda, observou-se um aumento temporal do valor da produção. Todavia, baixas produtividades foram observadas durante todo o período amostral. Visto a importância da cana-de-açúcar para o segmento agrícola de Alagoa Nova, ações de incentivo à melhoria dos índices produtivos dessa cultura devem ser incentivadas, buscando-se assim, incrementar essa atividade localmente.
•Methyl jasmonate (MJ) mitigated salt stress effects on purple basil.•MJ increased chlorophyll, anthocyanin, sugars, and phenolics in purple basil.•MJ increased the growth and post-harvest quality of ...purple basil.
The objective of this study was to evaluate the potential of methyl jasmonate (MJ) in mitigating the negative effects of salt stress on purple basil. For this, plants were grown in an entirely randomized design in a 3 × 2 factorial scheme (salinity × MJ treatments), and seven replicates. Salinity levels corresponded to non-stress (irrigation water without NaCl addition), mild stress (40 mM NaCl), and severe stress (80 mM NaCl), and MJ treatments corresponded to control (0 µM – water) or 1 mM solutions, applied as leaf sprays. The growth, physiology, and post-harvest attributes of purple basil were determined. Salt stress impaired growth, photosynthetic capacity, chlorophyll content, and relative water content, while it increased electrolyte leakage (P ≤ 0.05). However, the application of exogenous methyl jasmonate (MJ) mitigated the effects of salt stress on growth and gas exchange in purple basil. MJ also increased chlorophyll and relative water content while decreasing electrolyte leakage. Mild and severe salt stress differentially impacted chlorophyll fluorescence, while methyl jasmonate (MJ) partially mitigated these effects. Salt stress also reduced the contents of anthocyanins, sugars, and phenolic compounds, whereas MJ increased their levels under both non-stressed and salt-stressed conditions. In conclusion, MJ alleviated the effects of mild and severe salt stress and enhanced the post-harvest quality of purple basil.
Currently, Brazil is the world's largest sugarcane producer, with a planted area of approximately 8.59 million hectares. For being a crop of great prominence in the world economy, sugarcane has been ...widely researched, especially in the study of the causes that limit its productivity, with emphasis on water availability, an important factor to be considered in Brazil, because much of the cultivation takes place in drought regions, and the producing locations are limited to seasonal rainfall. However, sugarcane may present certain mechanisms for tolerance to water stress, especially with the use of foliar fertilization for that tolerance. Therefore, this study aimed to analyze the effects of foliar fertilization as a form of tolerance to water deficit in sugarcane crop. Water stress is the responsible factor for promoting physiological changes in the crop, enabling structural and functional alterations at various organizational levels of the plant. Furthermore, another approach to minimize the effects of water stress in sugarcane is to explore the plant's defense mechanisms, especially with the use of foliar fertilization as an alternative to tolerance to water deficit, considering the several benefits caused by this application method. Plant regulators are a viable option for reducing the negative physiological causes of water stress in plants, besides helping the plant to maintain physiological processes with a rapid recovery after overcoming water stress.
Medicinal plants, since antiquity, have been relevant due to their therapeutic properties, are widely used for the prevention and treatment of diseases. However, the growth and production of these ...plants are impacted by a notorious environmental stressor, salinity. In this sense, this study aimed to review the impacts of salinity on plant development, the deleterious effects of this environmental stressor on the production of medicinal plants, and the production strategies of these species in saline conditions. Areas with salt excess problems have been increasing all over the planet, mainly due to human actions such as inadequate irrigation management. Salinity impacts plants at different times, the first phase results from osmotic stress, while the second derives from the ionic toxicity of the salt constituents. In medicinal plants, saline stress causes damage from germination to changes in morphological characteristics, physiology, nutrient concentration, and productivity. However, in some species, exposure to moderate degrees of salinity was positive for medicinal quality, with an improvement in the constitution of the essential oil. Strategies for the production of medicinal plants in saline conditions are reported in the literature, such as the use of amino acids (such as proline and betaine glycine), salicylic acid, arbuscular mycorrhizal fungi, resistance inducing genes, and projected nanoparticles. These strategies may represent an option for agricultural production in marginal areas and with waters with higher levels of salts.
We describe herein the catecholase-like catalytic activity and dopamine polymerization by using a dinuclear LCu
(μ-OH)
Cu
(ClO
)
(1) complex where L is the dinucleating triazine-based ligand ...6-chloro-N
,N
,N
,N
-tetrakis(pyridin-2-ylmethyl)-1,3,5-triazine-2,4-diamine. The kinetic parameters (k
= 0.318 s
, K
= 1.6 × 10
mol L
, and k
/K
= 198.8 L s
mol
), mechanistic insights into the oxidation of 3,5-di-tert-butyl catechol and early characterization of poly(dopamine) are presented.
We describe herein the catecholase-like catalytic activity and dopamine polymerization by using a dinuclear LCuII(μ-OH)2CuII(ClO4)2 (1) complex where L is the dinucleating triazine-based ligand ...6-chloro-N2,N2,N4,N4-tetrakis(pyridin-2-ylmethyl)-1,3,5-triazine-2,4-diamine. The kinetic parameters (kcat = 0.318 s-1, KM = 1.6 × 10-3 mol L-1, and kcat/KM = 198.8 L s-1 mol-1), mechanistic insights into the oxidation of 3,5-di-tert-butyl catechol and early characterization of poly(dopamine) are presented.
We describe herein the catecholase-like catalytic activity and dopamine polymerization by using a dinuclear LCu
II
(μ-OH)
2
Cu
II
(ClO
4
)
2
(
1
) complex where L is the dinucleating triazine-based ...ligand 6-chloro-
N
2
,
N
2
,
N
4
,
N
4
-tetrakis(pyridin-2-ylmethyl)-1,3,5-triazine-2,4-diamine. The kinetic parameters (
k
cat
= 0.318 s
−1
,
K
M
= 1.6 × 10
−3
mol L
−1
, and
k
cat
/
K
M
= 198.8 L s
−1
mol
−1
), mechanistic insights into the oxidation of 3,5-di-
tert
-butyl catechol and early characterization of poly(dopamine) are presented.
The catecholase-like catalytic activity and dopamine polymerization by using the dinuclear LCu
II
(μ-OH)
2
Cu
II
(ClO
4
)
2
(
1
) complex are here described.
