Pigweed
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. The Response of Different Weed Species to Glyphosate Using Ammonium Sulfate and Hard Water
RESUMO: Há estudos prévios sobre o antagonismo da dureza da água e o efeito do sulfato de amônio na eficácia do glyphosate. No entanto, os autores desses estudos observaram resultados conflitantes entre espécies de plantas daninhas. Experimentos em estufa foram conduzidos em duplicata na Universidade Ferdowsi de Mashhad, em um delineamento de blocos co
Planta daninha. Publicado em: 10/06/2019
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2. Multiple-and Cross-Resistance of Amaranthus retroflexus to Acetolactate Synthase (ALS) and Photosystem II (PSII) Inhibiting Herbicides in Preemergence
RESUMO A resistência a herbicidas em espécies do gênero Amaranthus ocorre frequentemente no mundo e está se tornando um grande problema em regiões algodoeiras no Brasil. O objetivo deste trabalho foi verificar a resistência cruzada e múltipla de biótipos de caruru-gigante (A. retroflexus) aos herbicidas utilizados em pré-emergência na cultura do al
Planta daninha. Publicado em: 06/05/2019
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3. Abordagem biológica de Amaranthus retroflexus L. (Amaranthaceae)
Ensaios biológicos foram realizados para determinação da toxidade de Amaranthus retroflexus L. (Amaranthaceae) conhecido popularmente como "redroot pigweed". Extratos desta espécie foram testados para avaliar sua bioatividade em Artemia salina e citoxidade em células bovinas de rim. Os valores de DL50 para Artemia salina foram medidos a 1700 ppm. As cé
Revista Brasileira de Farmacognosia. Publicado em: 2009-06
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4. Biological characteristics and herbicide susceptibility of five weed species of the Amaranthus genus. / Características biológicas e suscetibilidade a herbicidas de cinco espécies de plantas daninhas do gênero Amaranthus
Plant species classified in the Aramanthus genus are frequently found infesting brazilian agricultural areas, although there are few researches that evaluated the biological characteristics and the control of these species. Therefore, this work was conducted with the objective of analyzing the germination, the growth and the development, estimating the leaf
Publicado em: 2007
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5. Utilização de diferentes tipos de imobilização da enzima oxalato oxidase na construção de biossensores
This work is based on development of potentiometric and amperometric biosensors in order to analyse oxalate. Several technics of enzyme immobilization were used to immobilize oxalate oxidase on beet stem which were used as enzyme suport and submitted to differents kinds of immobilization ( gamma radiation, covalent linkage, adsortion and natural) making pote
Publicado em: 1996
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6. Phase-Sequence of Redroot Pigweed Seed Germination Responses to Ethylene and Other Stimuli 1
Phase-sequence studies showed that light, ethylene, and high temperature each enhanced germination of redroot pigweed (Amaranthus retroflexus L.) seeds when given during the first 24 hours of seed imbibition. Responses were maximal during the first 12 hours. After 48 hours all three stimuli given together caused 75% germination but each alone was ineffective
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7. Effects of Temperature, Water Potential, and Light on Germination Responses of Redroot Pigweed Seeds to Ethylene
The responses of redroot pigweed (Amaranthus retroflexus L.) seeds to nine ethylene concentrations between 0.5 and 50 microliters per liter were assessed at different temperatures and water potentials and in either continuous white light or darkness. Under all experimental treatments, the probit-transformed percentages increased linearly with the log of the
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8. Chloroplast membrane alterations in triazine-resistant Amaranthus retroflexus biotypes
The effectiveness of diuron, atrazine, procyazine, and cyanazine were compared in controlling growth of redroot pigweed (Amaranthus retroflexus L.) in hydroponic culture. A very marked differential inhibition response was observed for atrazine between resistant and susceptible biotypes. Procyazine and cyanazine exhibited less dramatic differential responses,
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9. A Survey of Plants for Leaf Peroxisomes 1
Leaves of 10 plant species, 7 with photorespiration (spinach, sunflower, tobacco, pea, wheat, bean, and Swiss chard) and 3 without photorespiration (corn, sugarcane, and pigweed), were surveyed for peroxisomes. The distribution pattern for glycolate oxidase, glyoxylate reductase, catalase, and part of the malate dehydrogenase indicated that these enzymes exi
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10. Breaking of seed dormancy by catalase inhibition.
Germination of some dormant seeds is promoted by solutions of thiourea, sodium nitrite, and hydroxylamine salts. The promotions are accompanied by irreversible inhibition of catalase (EC 1.11.1.6) in extracts from the seeds. The seeds are also promoted in germination by catechol and pyrogallol solutions. These effects are recorded for lettuce (Lactuca sativa
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11. Lipid Composition of Chloroplast Membranes from Weed Biotypes Differentially Sensitive to Triazine Herbicides
Chloroplasts were isolated from triazine-sensitive and triazine-resistant biotypes of common groundsel (Senecio vulgaris L.), common lambsquarter (Chenopodium album L.), and redroot pigweed (Amaranthus retroflexus L.). Chloroplast lipids were extracted and analyzed for differences among sensitive and resistant biotypes. The distribution of lipid between majo
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12. Purification and Species Distribution of Rubisco Activase
Ribulose-1,5-bisphosphate carboxylase/oxygenase (rubisco) activase, a soluble chloroplast protein which promotes light-dependent rubisco activation, was partially purified from spinach chloroplasts by ion-exchange and gel-filtration fast protein liquid chromatography. The protein could also be isolated using rate zonal centrifugation in sucrose gradients fol