Abstract
Summary Cis, trans- and trans, trans-xanthoxin are present in roots of Pisum sativum L., as determined by gas liquid chromatography. Esterification of the hydroxyl group of xanthoxin with perfluorobutyric acid enables the determination of extremely small amounts of this hormone by means of an electron capture detector. The levels of xanthoxin in decapitated and intact pea roots were compared in order to investigate the hormonal control of root branching. Eight hours after decapitation the level of xanthoxin decreased to less than 50% of the original amount. Root tips contained four times more xanthoxin than the remaining tissue. About one quarter of the xanthoxin found was the active cis, trans isomer, the remainder being trans, trans-xanthoxin. As xanthoxin is known to be an inhibitor of lateral root formation, it is hypothesized that this hormone is an endogenous factor controling the development of lateral roots.
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