• Satish C Bhatla


The discovery of brassinosteroids can be traced back to 1941 from Mitchell and Whitehead of the United States Department of Agriculture (USDA, Beltsville, MD) who reported that pollen extracts often have growth-promoting properties on other plant tissues. In 1970, Mitchell et al. reported that the crude extract of pollen from Brassica napus (rape) contained “brassins” which promoted rapid elongation of internodes in Phaseolus vulgaris. This elongation response was distinct from GA-mediated stem elongation. Subsequently, their work leads to the isolation and identification of brassinolide (BL) as the first steroidal plant growth regulator. Another steroid hormone called castasterone (SC) was isolated from insect galls of chestnut (Castanea sp.). Since then, a number of related steroidal compounds have been isolated which are collectively called as brassinosteroids (BRs). Structurally, BRs are C-27, C-28, and C-29 steroids with different functional groups on A and B rings and on the side chain. BRs occur in algae, ferns, gymnosperms, and angiosperms. They have not been detected in microorganisms. Brassinolide is a C-28 brassinosteroid and exhibits highest activity among all BRs so far known.


Brassinolide BRI1 (brassinosteroid receptor) Brassinosteroids Castasterone 

Suggested Further Readings

  1. Clouse SD (2015) A history of brassinosteroid research from 1970 through 2005: thirty-five years of phytochemistry, physiology, genes and mutants. J Plant Growth Regul 34:828–844CrossRefGoogle Scholar
  2. Fariduddin Q, Yusuf M, Ahmad I, Ahmad A (2014) Brassinosteroids and their role in response of plants to abiotic stress. Biol Plant 58:9–17CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Satish C Bhatla
    • 1
  1. 1.Department of BotanyUniversity of DelhiNew DelhiIndia

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