Department o f Biology, University of California at San Diego, La Jolla, CA 92093-01 16, USA Lactococcus lactis takes up glucose and the nonmetabolizable glucose analogue 2-deoxyglucose (2DG) via the phosphotransferase system and extrudes the accumulated sugar phosphates in a process apparently dependent on a cytoplasmic sugar-phosphate phosphatase. Uptake of 2DG into L. lactis vesicles was sho...

BACKGROUND AND AIMS Differential responses of closely related species to submergence can provide insight into the evolution and mechanisms of submergence tolerance. Several traits of two wetland species from habitats with contrasting flooding regimes, Rorippa amphibia and Rorippa sylvestris, as well as F(1) hybrid Rorippa × anceps were analysed to unravel mechanisms underlying submergence toler...

Extracellular calcium (Ca2+) is the major physiological regulator of parathyroid function; high Ca2+ decreases PTH secretion as well as reduces cAMP accumulation. There is an increasing body of evidence suggesting the presence of a receptor-like mechanism at the surface of the parathyroid cell which mediates these and other actions of Ca2+. In the present studies we used the lectin Concanavalin...

The aim of this study was to investigate carbohydrate metabolism in rice seedlings subjected salt-alkaline stress. Two relatively tolerant (Changbai 9) and sensitive (Jinongda 138) cultivars, grown hydroponically, were stress via 50 mM solution. content the activities metabolism-related enzymes leaves roots investigated. results showed that contents sucrose, fructose, glucose increased under St...

results although a hypocaloric diet could prevent the progression of fat accumulation in liver, the diet composition is another aspect which should be considered in diet therapy of patients with nafld. conclusions several studies assessed the effects of dietary composition on fat storage in liver; however, their findings are inconsistent. most studies focused on the quantity of carbohydrate and...

Water-soluble carbohydrates (WSCs; composed of mainly fructans, sucrose [Suc], glucose [Glc], and fructose) deposited in wheat (Triticum aestivum) stems are important carbon sources for grain filling. Variation in stem WSC concentrations among wheat genotypes is one of the genetic factors influencing grain weight and yield under water-limited environments. Here, we describe the molecular dissec...

frost tolerance of winter wheat depends primarily on a strong vernalization requirement, delaying the transition to reproductive phase. the responses of four bread wheat cultivars (triticum aestivum l.) to low-temperatures were examined in controlled environment and field conditions. prolonged cold treatment accelerated the transition to reproductive development in winter wheats (cv. norstar an...

How trees sense source-sink carbon balance remains unclear. One potential mechanism is a feedback from non-structural carbohydrates regulating photosynthesis and removing excess as waste respiration when the balance of photosynthesis against growth and metabolic activity changes. We tested this carbohydrate regulation of photosynthesis and respiration using branch girdling in four tree species ...