Brassinolide antiecdysteroid activity

Particularly rich in B. are pollens (for Brassica napus ca. 100 xg/kg). B., especially brassinolide and 24-epibrassinolide, have unusually high phytohormonal activity. B. effect a general promotion of growth in plants (e. g., in roots), stimulate photosynthesis and protein biosynthesis, modulate the mode of action of other phytohormones, and delay senescence processes. B. exhibit antiecdysteroid effects on insects. For practical uses of B. the so-called anti-stress action on plants is of major interest and has been detected in field experiments under unfavorable cultivation conditions (e.g., drought, cold, nutrient deficiency, pest infestation). 

Q brassinosteroids and the ecdysteroids are apparent and have led to some detailed examinations of the antiecdysteroid effects of brassinosteroids. The fact that both groups of compounds are exceedingly active in thdr respective domains makes them interesting models for testing in reciprocal systems and for structural modifications to pursue structure activity relationships. Again, only those brassinosteroids that are available in relatively abundant amounts have been evaluated and these include brassinolide, 22S,23S-homobrassinolide and 22S,23S-homocastasterone (Figure 6). These are similar in structure to ecdysone, 20- ... 

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See also in sourсe #XX -- [ , ]

See also in sourсe #XX -- [ , ]

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