Nuclear envelope

Double-membrane structure; the outer membrane is continuous with the endoplasmic reticulum and the two membranes are perforated by nuclear pore complexes

TLS Online TPP Program

#Id: 10233

#Unit 6. System Physiology – Plant

BES1 & BZR1 give BR response

Phosphorylated BIN2 inhibits BES1 & BZR1 

Phosphorylated BIN2 is degraded by BSU1 

BSK proteins activate BSU1 phosphatase.

BRI1–BAK1-BR complex activates BSK

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#Id: 10234

#Unit 6. System Physiology – Plant

BRI1–BAK1-BR-→ BSK--→BSU1--→degradation of Phosphorylated BIN2-----→activation of BES1 & BZR1--→BR Response

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#Id: 10235

#Unit 6. System Physiology – Plant

Brassinosteroids, like gibberellins, suppress photomorphogenesis in the dark.

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#Id: 10236

#Unit 6. System Physiology – Plant

DE-ETIOLATED2 (DET2) gene, which encodes a brassinosteroid biosynthetic gene. Det2 loss-of-function mutants have reduced levels of brassinosteroids, resulting in a de-etiolated appearance of the seedling even when grown in the dark

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#Id: 10237

#Unit 6. System Physiology – Plant

Brassinosteroids are also required for promotion of cell

elongation by gibberellins, and gibberellin-induced degradation

of the DELLA repressor enhances the brassinosteroid response.

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#Id: 10238

#Unit 6. System Physiology – Plant

OsGSR1, a member of the gibberellic acid–stimulated gene family, acts as a positive regulator of both the gibberellic acid response and brassinosteroid biosynthesis.