HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Google Scholar Articles by Jensen, L. B. Articles by Olofsdotter, M. PubMed Articles by Jensen, L. B. Articles by Olofsdotter, M. Agricola Articles by Jensen, L. B. Articles by Olofsdotter, M. Related Collections Weed Management Allelopathy Rice

Quantitative Trait Loci Analysis of Allelopathy in Rice

^a Univ. of Aarhus, Dep. of Genetics and Biotechnology, DK-4200 Slagelse, Denmark
^b CIRAD-AMIS, UMR PIA, TA40/03, Avenue Agropolis 34398 Montpellier Cedex 5, France
^c Øresund Food Network, Arne Jacobsens Allé 15-17,1, DK-2300 København S, Denmark

^* Corresponding author (LouiseB.Jensen{at}agrsci.dk).

The allelopathic potential of rice (Oryza sativa L.) against Echinochloa crus-galli (L.) Beauv. was investigated under both laboratory and greenhouse conditions. A population of 150 recombinant inbred lines (RILs) was derived through single-seed descent from a cross between the indica cultivar AC1423, known to have a strong allelopathic potential, and the aus cultivar Aus196, with low allelopathic potential. The RILs together with the parents were first phenotyped using the laboratory assay known as the relay seeding technique. The screening showed that with regards to allelopathic potential the population phenotype was normally distributed. Two quantitative trait loci (QTLs) were located on chromosomes 4 and 7, explaining 20% of the phenotypic variation. A second relay seeding experiment was set up, this time including charcoal in the perlite. This screening showed that the allelopathic rice varieties did not have any effect on the weed species when grown with charcoal, the charcoal reversing the effect of any potential allelochemicals exuded from the rice roots. The second phenotypic experiment was conducted under greenhouse conditions in pots. Thirteen QTLs were detected for four different allelopathic measurements, located on seven chromosomes, and individually explaining between 5 and 10% of the phenotypic variation. Some QTLs from both experiments located to the same genomic regions. The results show that breeding to increase rice allelopathic potential is possible.

Abbreviations: GHWRB, greenhouse weed root biomass • GHWRL, greenhouse weed root length • GHWSB, greenhouse weed shoot biomass • GHWSL, greenhouse weed shoot length • LOD, logarithm of odds • PCR, polymerase chain reaction • QTL, quantitative trait locus • RIL, recombinant inbred line • RLSWRL, relay seeding weed root length • SSR, simple sequence repeat

All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has been obtained by the publisher.

Received for publication September 27, 2007.