Occurrence of Nine Pyrrolizidine Alkaloids in L. Depending on Developmental Stage and Season.

The contamination of phytopharmaceuticals and herbal teas with toxic plants is an increasing problem. L. is a particularly noxious weed in agricultural and horticultural crops due to its content of toxic pyrrolizidine alkaloids (PAs).

Nitrogen fixation by white lupin under phosphorus deficiency.

Background And Aims: White lupin is highly adapted to growth in a low-P environment. The objective of the present study was to evaluate whether white lupin grown under P-stress has adaptations in nodulation and N2 fixation that facilitate continued functioning.

Methods: Nodulated plants were grown in silica sand supplied with N-free nutrient solution containing 0 to 0.

Successive maturation and senescence of individual leaves during barley whole plant ontogeny reveals temporal and spatial regulation of photosynthetic function in conjunction with C and N metabolism.

During ontogeny of barley plants (Hordeum vulgare, L. cv. Barke), a continuous developmental gradient of new leaves at the top and lower leaves undergoing senescence is maintained.