Abscisic Acid Biosynthesis in Leaves and Roots of Xanthium strumarium

Abscisic Acid Metabolism in Relation to Water Stress and Leaf Age in Xanthium strumarium.

Intact plants of Xanthium strumarium L. were subjected to a water stress-recovery cycle. As the stress took effect, leaf growth ceased and stomatal resistance increased. The mature leaves then wilted, followed by the half expanded ones. Water, solute, and pressure potentials fell steadily in all leaves during the rest of the stress period. After 3 days, the young leaves lost turgor and the plan...

Biological activities of xanthatin from Xanthium strumarium leaves.

The objective of the present work was to evaluate the biological activities of the major bioactive compound, xanthatin, and other compounds from Xanthium strumarium (Asteraceae) leaves. Inhibition of bloodstream forms of Trypanosoma brucei brucei and leukaemia HL-60 cell proliferation was assessed using resazurin as a vital stain. Xanthatin was found to be the major and most active compound aga...

Xanthophylls and abscisic Acid biosynthesis in water-stressed bean leaves.

Experiments were designed to obtain evidence about the possible role of xanthophylls as abscisic acid (ABA) precursors in water-stressed leaves of Phaseolus vularis L. Leaves were exposed to (14)CO(2) and the specific activities of several major leaf xanthophylls and stress-induced ABA were determined after a chase in (12)CO(2) for varying periods of time. The ABA specific radioactivities were ...

Comparative Transcriptome Analysis Identifies Putative Genes Involved in the Biosynthesis of Xanthanolides in Xanthium strumarium L.

Xanthium strumarium L. is a traditional Chinese herb belonging to the Asteraceae family. The major bioactive components of this plant are sesquiterpene lactones (STLs), which include the xanthanolides. To date, the biogenesis of xanthanolides, especially their downstream pathway, remains largely unknown. In X. strumarium, xanthanolides primarily accumulate in its glandular trichomes. To identif...

Abscisic Acid biosynthesis and response.