ABSTRACT
A two-step process combining direct and indirect somatic embryogenesis, on solid and liquid medium, respectively is described for Theobroma cacao L. Staminodes and petals from unopened bud flowers are used to induce primary direct embryos. Then, these primary embryos are cut to produce embryogenic calli which will develop secondary embryos. This step of indirect SE allows us to produce large quantities of embryos and to do mass propagation using liquid culture medium. Despite a very strong clone dependency and high batch-to-batch variability, about 80% of T. cacao cultivars respond to somatic embryogenesis and can be propagated by this method.
Subject(s)
Cacao , Embryonic Development , Flowers/genetics , Plant Somatic Embryogenesis Techniques/methods , SeedsABSTRACT
Neonatal hyperglycaemia is common in extremely low birth weight (ELBW, <1,000 g) infants, associated with a number of adverse clinical outcomes, and usually treated with continuous intravenous insulin infusion (CIVII). We report a case of continuous subcutaneous insulin infusion (CSII) in an ELBW neonate (730 g, 25 weeks GA) requiring insulin infusion for transient idiopathic hyperglycaemia. After presenting hyperglycaemia on day 4, the patient was treated with CIVII. From day 12 to 34, CSII was used to replace central venous catheter. Insulin requirements were lower and glycaemia more stable under CSII. No side effect was noticed. CSII was also beneficial for developmental care, allowing parents to be more easily involved in their baby's care. Thus, CSII appeared to be a safe and reliable alternative for insulin administration in ELBW infants. However, indication and management requires training of the NICU team by paediatric diabetes specialists.
Subject(s)
Diabetes Mellitus, Type 1 , Hyperglycemia , Infant, Newborn, Diseases , Blood Glucose , Child , Diabetes Mellitus, Type 1/drug therapy , Humans , Hyperglycemia/drug therapy , Hypoglycemic Agents/adverse effects , Infant , Infant, Newborn , Infant, Newborn, Diseases/drug therapy , Injections, Subcutaneous , Insulin , Insulin Infusion SystemsABSTRACT
The establishment of cocoa embryogenic cell lines in liquid medium starting from high frequency somatic embryogenesis (HFSE) callus is described. The growth kinetics of the cultures during the multiplication and the expression steps conducted in 250 mL Erlenmeyer flasks were described for three genotypes selected for their agronomical traits (EET95, EET96, and EET103). The glucose and dissolved oxygen concentrations and the absorption of Murashige and Skoog medium macronutrients (nitrate, ammonium, potassium, sulfate, calcium, phosphorus, and magnesium) were monitored. The multiplication of the embryogenic calluses in a medium containing 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) at 1 mg L-1, initiated with an inoculation density of 20 g L-1 of callus, was achieved. The growth rate was characterized by two phases, with the second being concomitant with a depletion of phosphorus and magnesium, and a decrease in the embryogenic potential of the callus. The expression of the callus embryogenic capacity was conducted in an auxin-free medium. The embryo production starting from 1 and 5 g L-1 inoculation densities was compared. When placed in the optimal expression conditions in flasks, 1 g of callus produced 1000 to 1500 embryos within 5 to 7 wk. Finally, two paths for improving the plantlet regenerative capacities of cocoa SE produced in liquid medium were identified. Supplementing the expression medium with myo-inositol used as an osmotic agent at a concentration of 50 g L-1 increased the embryo-to-plantlet conversion rate from 13-16% to 40-48%. A 6-wk culture of the embryos on a maturation medium in Petri dishes optimized their subsequent development into plantlets.
