Vascular bundles were isolated from grapefruit (Citrus paradisi Macf.) during periods of rapid sucrose translocation into fruit. Invertase and sucrose synthase activities were assayed in these strands and compared with immediately adjacent tissues (inner most peel and segment epidermis) and phloem-free juice sacs during four growing seasons. Although sucrose synthase was present in sink cells, ...

Management of irrigation and fertilization in greenhouses, if not done correctly, can cause soil salinization. The use water treated with very low-frequency electromagnetic resonance fields (WVLF) reduce salinization effects on the photosynthetic biometric systems. Thus, purpose research to evaluate metabolism photosynthesis impact WVLF cultivation tomato crops subjected different levels fertig...

Severe declines in honey bee populations have made it imperative to understand key factors impacting honey bee health. Of major concern is nutrition, as malnutrition in honey bees is associated with immune system impairment and increased pesticide susceptibility. Beekeepers often feed high fructose corn syrup (HFCS) or sucrose after harvesting honey or during periods of nectar dearth. We report...

Activity of pyrophosphate:fructose-6-phosphate phosphotransferase (PFP) was investigated in relation to carbohydrate metabolism and physiological growth stage in mixotrophic soybean (Glycine max Merr.) suspension cells. In the presence of exogenous sugars, log phase growth occurred and the cells displayed mixotrophic metabolism. During this stage, photosynthetic oxygen evolution was depressed a...

It was previously demonstrated that, when solutions of hexose sugars such as glucose, fructose, or mannose are introduced into green leaves under aerobic conditions, an increase in sucrose is observed (l-3). The sucrose appears to be synthesized at the expense of the monosaccharides. Excised barley leaves infiltrated with 5 per cent glucose or fructose accumulated sucrose to a level of about 6 ...

Fig trees (Ficus carica L.) are commonly grown in the Mediterranean area, where salinity is an increasing problem coastal areas. Young, fruiting plants of cv. Dottato were subjected to moderate salt stress (100 mM NaCl added irrigation water) for 48 days before fruit sampling. To clarify effect stress, we investigated changes transcription main sugar metabolism-related genes involved synthesis,...

Several physiological processes were studied during sugar beet root development to determine the cellular events that are temporally correlated with sucrose storage. The prestorage stage was characterized by a marked increase in root fresh weight and a low sucrose to glucose ratio. Carbon derived from (14)C-sucrose accumulation was partitioned into protein and structural carbohydrate fractions ...

The frog ventricle in sucrose solution contracts for several hours at 25 degrees C, and for as long as 24 hours at 5 degrees G. The possibility that a fraction of the extracellular fluid remains outside of the excitable membrane was examined by measuring the efflux of tracers. The half-time for the efflux to sucrose solution at 25 degrees C of C(14) sucrose is about 1 minute, for Na(24) is 6.5 ...