Brassinosteroid

Brassinosteroids are plant steroid hormones that regulate growth, development, and responses to environmental stresses. Their signaling promotes cell expansion and division and coordinates development with environmental conditions.

Brassinosteroid biosynthesis: The enzymatic pathway that produces brassinosteroid hormones from sterol precursors. This pathway supplies the hormones whose abundance helps set growth and developmental responses.
Plant height: The vertical extent of a plant, shaped by stem growth, internode length, and development. Brassinosteroid effects on cell expansion and division can substantially alter stature.
Plant hormone: A signaling molecule that coordinates growth, development, or environmental responses in plants. Brassinosteroids belong to the broader system of plant hormonal regulation.
Brassinolide: A highly active brassinosteroid first isolated from rapeseed pollen. Its discovery established a potent natural example of the hormone class.
BRI1: A receptor kinase that binds brassinosteroids at the plant cell surface. BRI1 initiates the best-characterized brassinosteroid signaling pathway.
Grain filling: The accumulation of reserves in developing cereal grains after flowering. Brassinosteroid signaling can influence grain development and yield-related traits.
Auxin: A plant hormone family that regulates cell expansion, division, and developmental patterning. Auxin and brassinosteroids interact in growth processes such as stem elongation.
Castasterone: A naturally occurring brassinosteroid and a precursor to brassinolide in some plants. It illustrates the structural diversity and biosynthetic relationships within the class.
BES1: A plant transcription factor regulated by brassinosteroid signaling. Brassinosteroid signaling activates BES1-family factors that alter growth-related gene expression.
Drought tolerance: The capacity of an organism to maintain function and survival under limited water availability. Brassinosteroids participate in growth and physiological responses during water deficit.

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