| toxic potential of oleander derived compost and vegetables grown with oleander soil amendments. | california recycles 50% of previously disposed trash. increased use of yardwastes and composts has raised concern about toxic materials in these products. oleander is a toxic shrub common to ca landscapes and is frequently clipped and disposed of in greenwaste containers, resulting in concerns about the toxicity of oleander-contaminated yardwastes and composts from these wastes. information about breakdown of oleandrin (one of the glycoside toxicants of oleander) during composting or the ability ... | 2003 | 12882497 |
| predicting lettuce canopy photosynthesis with statistical and neural network models. | an artificial neural network (nn) and a statistical regression model were developed to predict canopy photosynthetic rates (pn) for 'waldman's green' leaf lettuce (latuca sativa l.). all data used to develop and test the models were collected for crop stands grown hydroponically and under controlled-environment conditions. in the nn and regression models, canopy pn was predicted as a function of three independent variables: shootzone co2 concentration (600 to 1500 micromoles mol-1), photosynthet ... | 1998 | 11542672 |
| nutrient solution cooling and its effect on temperature of leaf lettuce in hydroponic system. | the heat transfer characteristics of a hydroponic system were experimentally verified after theoretical establishment and the effect of nutrient solution cooling on the plant temperature was investigated. about 96 percent of the total heat flow transferred from culture bed to nutrient solution was the conductive heat through planting board and partitioning materials. the average and maximum temperatures of the leaf lettuce decreased 0.6 and 1.5 degrees c., respectively, with cooling of nutrient ... | 1996 | 11541574 |
| transcriptome analysis and anthocyanin-related genes in red leaf lettuce. | this study aimed to analyze the transcriptome profile of red lettuce and identify the genes involved in anthocyanin accumulation. red leaf lettuce is a popular vegetable and popular due to its high anthocyanin content. however, there is limited information available about the genes involved in anthocyanin biosynthesis in this species. in this study, transcriptomes of 15-day-old seedlings and 40-day-old red lettuce leaves were analyzed using an illuminia hiseqtm 2500 platform. a total of 10.6 gb ... | 2016 | 26909931 |
| minitron ii system for precise control of the plant growth environment. | a transparent, cylindrical chamber system was developed to allow measurement of gas-exchange by small crop canopies in the undisturbed plant growth environment. the system is an elaboration of the minitron system developed previously to compare growth of small plants in different environments within the same general growth area. the minitron ii system described herein accommodates hydroponic culture and separate control of atmospheric composition in individual chambers. root and shoot environmen ... | 1988 | 11539769 |
| nitrogen limited red and green leaf lettuce accumulate flavonoid glycosides, caffeic acid derivatives, and sucrose while losing chlorophylls, β-carotene and xanthophylls. | reduction of nitrogen application in crop production is desirable for ecological and health-related reasons. interestingly, nitrogen deficiency can lead to enhanced concentrations of polyphenols in plants. the reason for this is still under discussion. the plants' response to low nitrogen concentration can interact with other factors, for example radiation intensity. we cultivated red and green leaf lettuce hydroponically in a mediterranean greenhouse, supplying three different levels of nitroge ... | 2015 | 26569488 |
| variation of the pseudomonas community structure on oak leaf lettuce during storage detected by culture-dependent and -independent methods. | the genus pseudomonas plays an important role in the lettuce leaf microbiota and certain species can induce spoilage. the aim of this study was to investigate the occurrence and diversity of pseudomonas spp. on oak leaf lettuce and to follow their community shift during a six day cold storage with culture-dependent and culture-independent methods. in total, 21 analysed partial pseudomonas 16s rrna gene sequences matched closely (> 98.3%) to the different reference strain sequences, which were di ... | 2016 | 26425802 |
| senescence inhibition and respiration induced by growth retardants and n-benzyladenine. | senescence of grand rapids leaf lettuce was greatly reduced at 3 storage temperatures by post-harvest treatment with n,n-dimethylaminosuccinamic acid (alar) and 2-chloroethyltrimethylammonium chloride (ccc), but not with (6)n-benzyladenine (ba). conversely, alar and ccc were inactive on broccoli while ba was markedly effective. the deterioration and discoloration of mushrooms was inhibited by alar with no effect observed from ba or ccc.the inhibition of senescence by ba and the growth retardants ... | 1966 | 16656368 |
| photosynthetic productivity and vibration/acceleration stress considerations for higher plants in bioregenerative systems. | the food production group of the nasa closed ecology life support systems (celss) program is conducting research to optimize production of candidate species from each of the major categories of food crop. studies are underway with soybean, wheat and potato, and leaf lettuce. our laboratory emphasizes the controlled environment production of leaf lettuce. our objective is to obtain the greatest possible production of edible lettuce biomass in the smallest possible growing space in the shortest po ... | 1984 | 11539009 |