Lepidium Sativum
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Ocorrência de Pythiella vernalis em Pythium aphanidermatum de cultura hidropônica de agrião no Brasil
Pythiella vernalis foi isolada de Pythium aphanidermatum de cultura hidropônica de agrião, no município de Taubaté, SP, Brasil. É a primeira citação de Pythiella vernalis no Brasil e a primeira referência mundial da espécie em Pythium aphanidermatum.
Summa Phytopathologica. Publicado em: 2009-12
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2. Glucosinolate Biosynthesis: Sulfation of Desulfobenzylglucosinolate by Cell-Free Extracts of Cress (Lepidium sativum L.) Seedlings
After removal of myrosinase activity by concanavalin A-Sepharose 4B chromatography, cell-free extracts of light-grown cress (Lepidium sativum L.) seedlings, catalyzed the sulfation of desulfobenzylglucosinolate (Km, 0.23 millimolar) to benzylglucosinolate using PAPS (Km, 1 millimolar) as sulfur donor. Sulfotransferase activity, which was optimal at pH 9.0, w
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3. Auxin Transport Inhibitors: III. Chemical Requirements of a Class of Auxin Transport Inhibitors
The structural requirements of a proposed class of auxin transport inhibitors have been shown to be very similar to those required to inhibit the cress (Lepidium sativum) root geotropic response. A 2-carboxyphenyl group separated by a conjugated system of atoms from a second aromatic ring appears to be necessary for a molecule to have high activity.
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4. Reversible Effects of Green and Orange-Red Radiation on Plant Cell Elongation 1
The differential cell elongation of cress (Lepidium sativum) roots that results in geotropic bending can be decreased by green radiation with an action spectrum peaking at 550 nm. This decrease can be negated by prior or simultaneous irradiation by orange-red light with an action spectrum peaking at 620 nm. The green radiation appears to be effective during
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5. Effects of Aflatoxin on Seeding Growth and Ultrastructure in Plants
Nineteen plants belonging to 11 species of the cruciferae were studied to determine the effects of aflatoxin B1 on seed germination and seedling development. Germination was not inhibited in any test organism at a concentration of 100 μg of aflatoxin per ml of agar substrate. Inhibition of elongation of the hypocotyls and roots in the species studied varied
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6. Quantification of Allelopathic Potential of Sorghum Residues by Novel Indexing of Richards' Function Fitted to Cumulative Cress Seed Germination Curves 1
The inhibitory activity of aqueous extracts of field-grown sorghum (Sorghum bicolor cv. Bird-a-boo) herbage and roots was quantitatively indexed by three aspects of cumulative cress (Lepidium sativum cv. Curlycress) seed germination: the germination onset; weighted mean rate; and final germination percentage. Extract potency was greatest for herbage collecte
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7. An Empirical Function for the Description of Root Growth
Vertical growth of young cress roots (Lepidium sativum L.) which have not yet attained their steady state is analyzed in terms of the relative elemental rate of elongation (RELEL). To this end, an empirical model function is suggested which describes, by means of six parameters, the movement of marker particles on the root surface. These parameters are inter
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8. Autonomic Straightening after Gravitropic Curvature of Cress Roots1
Few studies have documented the response of gravitropically curved organs to a withdrawal of a constant gravitational stimulus. The effects of stimulus withdrawal on gravitropic curvature were studied by following individual roots of cress (Lepidium sativum L.) through reorientation and clinostat rotation. Roots turned to the horizontal curved down 62�
American Society of Plant Physiologists.
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9. Characterization of Brassinazole, a Triazole-Type Brassinosteroid Biosynthesis Inhibitor1
Screening for brassinosteroid (BR) biosynthesis inhibitors was performed to find chemicals that induce dwarfism in Arabidopsis, mutants that resembled BR biosynthesis mutants that can be rescued by BR. Through this screening experiment, the compound brassinazole was selected as the most potent chemical. In dark-grown Arabidopsis, brassinazole-induced morphol
American Society of Plant Physiologists.
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10. A Calcium-Selective Channel from Root-Tip Endomembranes of Garden Cress1
A Ca2+ channel from root-tip endomembranes of garden cress (Lepidium sativum L.) (LCC1) was characterized using the planar lipid-bilayer technique. Investigation of single-channel recordings revealed that LCC1 is voltage gated and strongly rectifying. In symmetrical 50 mm CaCl2 solutions, the single-channel conductance was 24 picosiemens. LCC1 showed a
American Society of Plant Physiologists.
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11. A Novel Inhibitor of 9-cis-Epoxycarotenoid Dioxygenase in Abscisic Acid Biosynthesis in Higher Plants1
Abscisic acid (ABA) is a major regulator in the adaptation of plants to environmental stresses, plant growth, and development. In higher plants, the ABA biosynthesis pathway involves the oxidative cleavage of 9-cis-epoxycarotenoids, which may be the key regulatory step in the pathway catalyzed by 9-cis-epoxycarotenoid dioxygenase (NCED). We developed a new i
American Society of Plant Biologists.