Journal Article

Isolation and Identification of an Anti-Bolting Compound, Hexadecatrienoic Acid Monoglyceride, Responsible for Inhibition of Bolting and Maintenance of the Leaf Rosette in Radish Plants

Yuko Yoshida, Noboru Takada and Yasunori Koda

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 51, issue 8, pages 1341-1349
Published in print August 2010 | ISSN: 0032-0781
Published online July 2010 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcq094
Isolation and Identification of an Anti-Bolting Compound, Hexadecatrienoic Acid Monoglyceride, Responsible for Inhibition of Bolting and Maintenance of the Leaf Rosette in Radish Plants

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Generally, the bolting (stem elongation from rosette plants) of winter annuals is believed to be induced by an increase in the levels of gibberellin that occurs after a certain period of chilling (vernalization), and a deficiency of gibberellin allows the plant to maintain a rosette style. Lack of direct evidence proving the above assumption in radish plants (Raphanus sativus L.) encouraged us to assume the presence of an anti-bolting compound actively maintaining the rosette habit through inhibition of bolting. Anti-bolting activity was detected in an extract of rosette shoots of radish plants by an assay using seedlings cultured in vitro. The causal compound that strongly inhibited bolting was isolated and identified as α-(7Z,10Z,13Z)-hexadecatrienoic acid monoglyceride (16:3 monoglyceride). This compound did not inhibit leaf production at the apical meristem, indicating that it merely inhibits growth at the internode. The compound disappeared completely after vernalization, and bolting occurred thereafter. The results suggest that the release from inhibition by 16:3 monoglyceride induces the initiation of bolting. The possible mechanism by which the compound exerts the activity is discussed.

Keywords: Anti-bolting compound; Hexadecatrienoic acid monoglyceride; Inhibition of bolting; Radish; Raphanus sativus L; Sensitivity to gibberellin

Journal Article.  5278 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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