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Additional recommended knowledge
Brassinosteroids (BR) are a group of steroidal plant hormones. Brassinolide was the first of these steroid compounds discovered in 1973, when it was shown that pollen from Brassica napus could promote stem elongation and cell divisions and that the biologically active molecule was a steroid that the authors called Brassins. Since their discovery over 70 BR compounds have been isolated from plants
The BR is biosynthesised from campesterol, the biosynthetic pathway was elucidated by Japanese researchers and later show to be correct through the analysis of BR biosynthesis mutants in Arabidopsis, tomato and peas. The sites for BR synthesis in planta have not been experimentally demonstrated. One well-supported hypothesis is that all tissues produce BRs, since BR biosynthetic and signal transduction genes are expressed in a wide range of plant organs, and short-distance activity of the hormones also supports this. Experiments have shown that long distance transport is possible and flows in an acropetal direction, but it is not known if this movement is biologically relevant.
BRs have been shown to be involved in numerous plant processes:
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Brassinosteroid". A list of authors is available in Wikipedia.|