Brassinosteroids and Monoglycerides in Immature Seeds of Cassia tora as the Active Principles in the Rice Lamina Inclination Bioassay

Abstract

Brassinolide (1), castasterone (2), typhasterol (3), teasterone (4), and 28-norcastasterone (5), as well as monopalmitin and monoolein, were identified from immature seeds of Cassia tora L. as the active principles in the rice lamina inclination bioassay. The biological activity of monoolein was five orders of magnitude lower than that of brassinolide, but higher than that of indole-3-acetic acid.