Hormones213-page20

Hormones213-page20 - elongation and cell division Without...

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Plant Growth Regulators - 20 Brassinolides (Brassinosteroids) Brassinolides is a plant steroid discovered in pollen of members of the mustard family, and studied in Arabidopsis . Chemically the brassinosteroids are similar to animal steroid hormones, and have similar genes that code for the steroid synthesis pathways. The brassinosteroids functions overlap those of other plant hormones, making them challenging to study and their effects may be additive. Brassinosteoroids activate signal transduction pathways that promote cell
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Unformatted text preview: elongation and cell division. Without the brassinosteroid, a kinase inhibits a transcription factor. The brassinosteroid signal reception deactivates the kinase, promoting gene transcription. • Brassinosteroids also promote differentiation of xylem tissue, and perhaps other tissues, too. • Brassinosteroids can affect leaf abscission. • Brassinosteroids promote pollen tube growth. • Brassinosteroids promote seed germination • Absence of brassinosteroids results in dwarf plants....
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This note was uploaded on 01/08/2012 for the course BIO 213 taught by Professor Makina during the Fall '09 term at SUNY Stony Brook.

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