In the G2 line of peas (Pisum sativum L.) senescence and death of the apical bud occurs only in long days (LD) in the presence of fruits. Removal of the fruits prevents apical senescence. One possible reason for the senescence-inducing effect of fruit is that the fruits produce a senescence-inducing factor which moves to the apical bud and is responsible for the effect. For this to be possible ...

Hydraulic conductivity in the terminal branches of mature beech trees (Fagus sylvatica L.) decreased progressively during winter and recovered in the spring. The objective of this study was to determine the mechanisms involved in recovery. Two periods of recovery were identified. The first recovery of hydraulic conductivity occurred early in the spring, before bud break, and was correlated with...

ligation of the common bile duct. A fairly rapid decrease in in vitro conjugation was found in the livers of the animals fed ethionine, beginning 2 days after initiation of the diet and reaching a minimum value of less than 1 per cent of the control level within 10-14 days. The defect in conjugation persisted for as long as the ethionine was fed (34 days). The level of conjugation returned to t...

To a dried extract Containing hippuric acid (HA), 1.0 mL of acetic anhydride and 2.0 mL of 0.5% p-dlmethyiamlnobenzaldehyde (DAB) solution In pyridine were added, and the solution was kept at 40 O C for 1 h after thorough mlxing. The absorbance was then determlned at 458 nm agalnst a blank containing acetic anhydride, DAB, and pyridine. This method was in good agreement with Beer’s law within 1...

This investigation was concerned with the acute effect of ethionine, thioacetamide, dimethylnitrosamine (DMN), or aflatoxin B, on hepatic polyribosomes and protein synthesis of rats fed purified diets either ad libitum for 3 to 29 weeks containing 0.025% N-2-fluorenylacetamide (2FAA) or 0.06% 3 -methyl-4-dimethylaminoazobenzene (3 Me-DAB) or by force-feeding for 3 days of diets containing 2-FAA...

In trees adapted to cold climates, conditions during autumn and winter may influence the subsequent timing of bud burst and hence tree survival during early spring frosts. We tested the effects of two temperatures during dormancy induction and mild spells (MS) during chilling on the timing of bud burst in three Picea abies (L.) Karst. provenances (58-66 degrees N). One-year-old seedlings were i...

Italian ryegrass (Lolium multiflorum Lam.) is a weed broadly found in fields cultivated with wheat and barley crops. Seed inputs into the soil before harvesting winter crops increase seed bank, ensuring survival. This study evaluated persistence of seeds subjected to burial depths over time. Experiments were carried out field for two years randomized block experimental design four repetitions. ...