Subscribe to thousands of academic journals for just $40/month
Read and share the articles you need for your research, all in one place.

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

Journal of Experimental Botany , Volume 58 (7): 1695 – May 1, 2007

Details

Publisher
Oxford University Press
Copyright
Copyright © 2010 Society for Experimental Biology
ISSN
0022-0957
eISSN
1460-2431
D.O.I.
10.1093/jxb/erm026
Publisher site
See Article on Publisher Site

Preview Only

Expand Tray Hide Tray

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

Abstract

Abstract 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.
Loading next page...

Preview Only. This article cannot be rented because we do not currently have permission from the publisher.

 
/lp/oxford-university-press/saturated-humidity-accelerates-lateral-root-development-in-rice-oryza-mZR0yjhr0A