Downregulation of pyrophosphate: d-fructose-6-phosphate 1-phosphotransferase activity in sugarcane culms enhances sucrose accumulation due to elevated hexose-phosphate levels

Analyses of transgenic sugarcane clones with 45–95% reduced cytosolic pyrophosphate: d-fructose-6-phosphate 1-phosphotransferase (PFP, EC 2.7.1.90) activity displayed no visual phenotypical change, but significant changes were evident in in vivo metabolite levels and fluxes during internode development. In three independent transgenic lines, sucrose concentrations increased between three- and sixfold in immature internodes, compared to the levels in the wildtype control. There was an eightfold increase in the hexose-phosphate:triose-phosphate ratio in immature internodes, a significant restriction in the triose phosphate to hexose phosphate cycle and significant increase in sucrose cycling as monitored by 13C nuclear magnetic resonance. This suggests that an increase in the hexose-phosphate concentrations resulting from a restriction in the conversion of hexose phosphates to triose phosphates drive sucrose synthesis in the young internodes. These effects became less pronounced as the tissue matured. Decreased expression of PFP also resulted in an increase of the ATP/ADP and UTP/UDP ratios, and an increase of the total uridine nucleotide and, at a later stage, the total adenine nucleotide pool, revealing strong interactions between PPi metabolism and general energy metabolism. Finally, decreased PFP leads to a reduction of PPi levels in older internodes indicating that in these developmental stages PFP acts in the gluconeogenic direction. The lowered PPi levels might also contribute to the absence of increases in sucrose contents in the more mature tissues of transgenic sugarcane with reduced PFP activity

Avaliação antropométrica e do ângulo quadricipital na osteoartrite de joelho em mulheres obesas

A osteoartrite (OA) é uma doença articular degenerativa, caracterizada por processo inflamatório, dor e deformidades; um de seus fatores preditivos é a obesidade. O objetivo deste estudo foi verificar possíveis correlações entre medidas antropométricas, o ângulo quadricipital (Q) e a osteoartrite de joelho. A amostra foi composta por 50 voluntárias obesas (30 com OA de joelho e 20 sem OA), com idade entre 40 e 60 anos. Foram mensurados, além do IMC (índice de massa corporal), circunferência abdominal (CA), perímetros de cintura e quadril para cálculo da relação cintura-quadril e o ângulo Q; a osteoartrite foi diagnosticada clinicamente e por meio de radiografia da articulação do joelho. Foram encontradas correlações positivas fracas entre IMC e ângulo Q e entre tempo de obesidade e grau de degeneração articular. A CA apresentou correlação positiva fraca com o grau de degeneração articular e o de gravidade da OA. O cálculo da razão de chance (OR) indica que as voluntárias com IMC>34 kg/m² e CA>110 cm tiveram 3,7 e 7 vezes, respectivamente, mais chance de apresentarem OA. A obesidade central, seu grau e duração possivelmente contribuem para a incidência da OA de joelhos em mulheres obesas. A circunferência abdominal foi a medida que melhor se correlacionou com a presença e grau de OA em obesas, o que aponta para a relevância de sua mensuração na avaliação clínica.Osteoarthritis (OA) is a degenerative joint disease characterized by inflammatory process, pain, and deformity; one of its main predictive factors is obesity. The aim of this study was to search for possible correlations between anthropometric measures, the Q angle and knee osteoarthritis. A sample of 50 obese women (30 with knee osteoarthritis and 20 with no joint disease), aged between 40 to 60 years, were assessed as to BMI (body mass index), abdominal circumference (AC), waist and hip perimeters (so as to calculate waist-hip ratio), and the Q angle; osteoarthritis was diagnosed by clinical exam and knee joint radiography. Results showed a positive, poor correlation between BMI and Q angle, as well as between time of obesity onset and degree of joint degeneration. AC was found to positively, though weakly, correlate with the degree of joint degeneration and of OA severity. Adjusted odds ratio for OA showed that women with BMI>34 kg/m² and AC>110 cm were respectively 3.7 and 7 times more likely to develop OA. The degree and duration of central obesity possibly contribute to incidence of knee OA in obese women. Abdominal circumference was the measure that most correlated with the degree of joint degeneration and of OA severity, which suggests it should be used in clinical evaluation

Accommodating Dynamic Oceanographic Processes and Pelagic Biodiversity in Marine Conservation Planning

Pelagic ecosystems support a significant and vital component of the ocean's productivity and biodiversity. They are also heavily exploited and, as a result, are the focus of numerous spatial planning initiatives. Over the past decade, there has been increasing enthusiasm for protected areas as a tool for pelagic conservation, however, few have been implemented. Here we demonstrate an approach to plan protected areas that address the physical and biological dynamics typical of the pelagic realm. Specifically, we provide an example of an approach to planning protected areas that integrates pelagic and benthic conservation in the southern Benguela and Agulhas Bank ecosystems off South Africa. Our aim was to represent species of importance to fisheries and species of conservation concern within protected areas. In addition to representation, we ensured that protected areas were designed to consider pelagic dynamics, characterized from time-series data on key oceanographic processes, together with data on the abundance of small pelagic fishes. We found that, to have the highest likelihood of reaching conservation targets, protected area selection should be based on time-specific data rather than data averaged across time. More generally, we argue that innovative methods are needed to conserve ephemeral and dynamic pelagic biodiversity

Analysis of sucrose accumulation in the sugarcane culm on the basis of <I>in vitro</I> kinetic data.

AgriwetenskappeInstituut vir PlantbiotegnologiePlease help us populate SUNScholar with the post print version of this article. It can be e-mailed to: [email protected]

Sucrose phosphate synthase and sucrose synthase activity during maturation of internodal tissue in sugar cane

AgriwetenskappeInstituut vir PlantbiotegnologiePlease help us populate SUNScholar with the post print version of this article. It can be e-mailed to: [email protected]

Ripening-related gene expression during fruit ripening in Vitis vinifera L. cv. Cabernet Sauvignon and Clairette blanche.

AgriwetenskappeInstituut vir PlantbiotegnologiePlease help us populate SUNScholar with the post print version of this article. It can be e-mailed to: [email protected]

Carbon allocation to the insoluble fraction, respiration and triose-phosphate cycling in the sugarcane culm

AgriwetenskappeInstituut vir PlantbiotegnologiePlease help us populate SUNScholar with the post print version of this article. It can be e-mailed to: [email protected]

Genes expressed in sugarcane maturing internodal tissue

AgriwetenskappeInstituut vir PlantbiotegnologiePlease help us populate SUNScholar with the post print version of this article. It can be e-mailed to: [email protected]