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... Evaluation of toxic residue effect of Thiodan on Apis mellifera L. with regard to different application surfaces A new method for the laboratory testing of toxic effects of pesticide residues on the honeybee is described which permits to evaluate the influence of the leafsurface of different cultivated plants and other testing substrates. The newly designed device facilitates the simulation of spr ...
... Ubiquitin is a ubiquitous protein involved in targeting proteins for degradation. Maize pollen was previously reported (Callis and Bedinger 1994) to show extremely low levels of ubiquitin monomer, and developmental significance was attributed to this surprising feature of maize pollen. However, we had previously shown (Muschietti et al. 1994) that tomato pollen had high levels of ubiquitin monomer ...
... The influence of low application rates of chlorsulfuron on the growth and reproduction of four taxonomically diverse plant species (canola, smartweed, soybean, and sunflower) were examined. Exposures examined ranged from 1 X 10(-3) to 8 X 10-(3) of the recommended field rates for cereal crops and were approximately 1,000 times less than the highest exposure recommended by the U.S. Environmental Pr ...
Helianthus annuus; Brassica napus; measurement; chemical degradation; dose response; jasmonic acid; gene expression; Triticum aestivum; Nicotiana tabacum; esters; stereochemistry; enzyme activity; chemical structure; seed germination; transgenic plants; cotyledons; proteinase inhibitors; reporter genes; chemical constituents of plants; chlorophyll; beta-glucuronidase
Abstract:
... The importance of the two chiral centers at C-3 and C-7 in the molecular structure of jasmonic acid in plant responses was investigated. We separated methyl jasmonate (MeJA) into (3R)- and (3S)-isomers with a fixed stereochemistry at C-3, but epimerization at C-7 is possible. The four isomers of the nonepimerizable analog 7-methyl MeJA were synthesized. These six esters and their corresponding aci ...
... A protocol is described, for the rapid screening of a large number of putative transgenic shoots. Genomic DNA is isolated and screened by PCR. To validate the purity of the DNA, PCR amplification is done with primers homologous to an endogenous gene. Multiplex PCR is used to screen for the transgenic shoots with two sets of primers, one set against the endogenous gene (internal control) and the ot ...
... Summer fallow is commonly used to stabilize winter wheat (Triticum aestivum L.) production in the Central Great Plains, but summer fallow results in soil degradation, limits farm productivity and profitability, and stores soil water inefficiently. The objectives of this study were to quantify the production and economic consequences of replacing summer fallow with spring-planted crops on the subse ...
... Crop diversification and crop sequencing can influence plant disease risk in cropping systems. The objective of this research was to determine the effect of 10 previous crops on leaf spot diseases of barley (Hordeum vulgare L.) and hard red spring wheat (Triticum aestivum L.). Barley and spring wheat were direct-seeded (no till) in the crop residue of 10 crops {barley, canola (Brassica napus L.), ...
... Cattle (Bos taurus) producers can replace a part of the traditional diet of barley (Hordeum vulgare L.) grain/silage with sunflower (Helianthus annus L.) seeds or canola meal (Brassica napus L.)/oil to enhance conjugated linoleic acids (CLA) content in milk and meat for its positive health benefits. The objective of this study is to investigate the effects of feeding sunflower or canola to finishi ...
... The plasma membrane is most likely the major target for sensing of aluminium (Al), leading to inhibition of plant root-growth. As a result of high external Al, alterations in plasma membrane composition may be expected in order to maintain its properties. As sphingolipids are characteristic components of this membrane, their involvement in membrane adjustment to increased Al concentrations was inv ...
... BACKGROUND AND AIMS: The root apical meristems (RAM) of flowering plant roots are organized into recognizable pattern types. At present, there are no known ecological or physiological benefits to having one RAM organization type over another. Although there are phylogenetic distribution patterns in plant groups, the possible evolutionary advantages of different RAM organization patterns are not un ...
... In the present study we compared the changes in chlorophyllase (Chlase) activity and chlorophyll content during leaf senescence in eleven plant species, using an improved Chlase activity assay. Parsley (Petroselinum sativum L.), vinca (Vinca rosea L.), squash (Cucurbita pepo L.), tomato (Lycopersicon esculentum L.), canola (Brassica napus L.), tobacco (Nicotia ...