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JXB Advance Access published online on March 23, 2007
Journal of Experimental Botany, doi:10.1093/jxb/erm026
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© 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


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[Abstract] [Full Text] [PDF]


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