Skip Navigation


JXB Advance Access originally published online on March 23, 2007
Journal of Experimental Botany 2007 58(7):1695-1704; doi:10.1093/jxb/erm026
This Article
Right arrow Full Text Freely available
Right arrow FREE Full Text (PDF) Freely available
Right arrow Supplementary Material
Right arrow All Versions of this Article:
58/7/1695    most recent
erm026v1
Right arrow E-letters: Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when E-letters are posted
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (1)
Right arrowRequest Permissions
Right arrow Disclaimer
Google Scholar
Right arrow Articles by Chhun, T.
Right arrow Articles by Tsurumi, S.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Chhun, T.
Right arrow Articles by Tsurumi, S.
Agricola
Right arrow Articles by Chhun, T.
Right arrow Articles by Tsurumi, S.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

© The Author [2007]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

RESEARCH PAPER

Saturated humidity accelerates lateral root development in rice (Oryza sativa L.) seedlings by increasing phloem-based auxin transport

Tory Chhun1, Yuichi Uno2, Shin Taketa3, Tetsushi Azuma2, Masahiko Ichii3, Takashi Okamoto1 and Seiji Tsurumi1,*

1Center for Supports to Research and Education Activities Isotope Division, Kobe University, Kobe, 657-8501 Japan
2Faculty of Agriculture, Kobe University, Kobe, 657-8501 Japan
3Faculty of Agriculture, Kagawa University, Miki, Kagawa, 761-0795 Japan

* To whom correspondence should be addressed. E-mail: tsurumis{at}scitec.kobe-u.ac.jp or tsurumis{at}silver.kobe-u.ac.jp

Auxin transport plays a significant role modifying plant growth and development in response to environmental signals such as light and gravity. However, the effect of humidity on auxin transport is rarely documented. It is shown here that the transport of labelled indole-3-acetic acid (IAA) from the shoot to the root is accelerated in rice (Oryza sativa L. ssp. indica cv. IR8) seedlings grown under saturated humidity (SH-seedlings) compared with plants grown under normal humidity (NH-seedlings). The development of lateral roots in SH-seedlings was greatly enhanced compared with NH-seedlings. Removal of the shoot from SH-seedlings reduced the density of lateral roots, and the application of IAA to the cut stem restored the lateral root density, while the decapitation of NH-seedlings did not alter lateral root development. Phloem-based auxin transport appeared responsible for enhanced lateral root formation in SH-seedlings since (i) the rate of IAA transport from the shoot to the root tip was greater than 3.5 cm h–1 and (ii) naphthylphthalamic acid (NPA)-induced reduction of polar auxin transport in the shoot did not influence the number of lateral roots in SH-seedlings. It is proposed that high humidity conditions accelerate the phloem-based transport of IAA from the leaf to the root, resulting in an increase in the number of lateral roots.

Key words: AUX1-like gene, auxin transport, humidity, lateral root development, Oryza sativa L. ssp. indica cv. IR8, phloem transport, rice seedlings

Received 4 October 2006; Revised 16 January 2007 Accepted 22 January 2007


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer:
Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.