期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 53, 期 378, 页码 2193-2200出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erf077
关键词
adventitious root suppression; cucumber; Cucumis sativus; Cucurbita; cytokinin; squash; xylem sap; zeatin riboside
Shoot cultures of cucumber were used to analyse the roles of root-derived substances in adventitious root formation on hypocotyl tissues. Xylem sap collected from the roots of squash had a strong inhibitory effect on the formation of hypocotyl adventitious roots. Double-solvent extraction followed by fractionation with both normal and reverse phase column chromatographies and analysis by liquid chromatography/tandem mass spectrometry identified transzeatin riboside (ZR) as the primary suppressor of adventitious root formation. ZR was the predominant cytokinin present in the xylem sap, occurring at a concentration of 2x10(-8) M. Application of ZR at concentrations from 3.16x10(-9) M effected inhibition of adventitious root formation. These results suggest that ZR transported from roots via xylem sap may act as an endogenous suppressor of hypocotyl adventitious root formation in planta.
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