Journal Article

Chlorogenic Acid Facilitates Root Hair Formation in Lettuce Seedlings

Megumi Narukawa, Kaori Kanbara, Yuji Tominaga, Yurika Aitani, Kazumasa Fukuda, Takaaki Kodama, Noriko Murayama, Yoshiki Nara, Takashi Arai, Masae Konno, Shinji Kamisuki, Fumio Sugawara, Masako Iwai and Yasunori Inoue

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 50, issue 3, pages 504-514
Published in print March 2009 | ISSN: 0032-0781
Published online January 2009 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcp010
Chlorogenic Acid Facilitates Root Hair Formation in Lettuce Seedlings

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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Root hairs, which arise from root epidermal cells, are tubular structures that increase the efficiency of water absorption and nutrient uptake. A low pH (pH 4) medium induced root hair formation in lettuce (Lactuca sativa L.) seedlings, and the decapitation of shoots inhibited root hair formation. The addition of shoot extract to the medium restored root hair formation in the decapitated lettuce seedlings. These results suggest that factors essential to the formation of root hairs may be present in the shoot. We purified one factor from the shoot that facilitates root hair formation. This factor was identified as chlorogenic acid (CGA), a common polyphenol in higher plants. The presence of exogenous CGA in the medium induced root hair formation in decapitated lettuce seedlings at pH 4.0 and in intact lettuce seedlings at pH 6.0. The optimum concentration of CGA for root hair formation was identified as 10–5 M. Decapitation of the shoots reduced the CGA content in the roots to approximately one-third that in intact plants. Application of the CGA biosynthesis inhibitor l-α-aminooxy-β-phenylpropionic acid (AOPP, 10–6 M) to intact seedlings grown at pH 4.0 reduced both the CGA content of the roots and the total amount of root hairs. The addition of exogenous CGA restored root hair formation in intact seedlings treated with AOPP. These results suggest that CGA is essential for root hair formation in lettuce seedlings.

Keywords: Chlorogenic acid; Lettuce; Low pH; Root hair.

Journal Article.  5393 words.  Illustrated.

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

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