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The qSD12 underlying gene promotes abscisic acid accumulation in early developing seeds to induce primary dormancy in rice

Permanent URL:
http://handle.nal.usda.gov/10113/43761
Abstract:
Seeds acquire primary dormancy during their development and the phytohormone abscisic acid (ABA) is known to play a role in inducing the dormancy. qSD12 is a major seed dormancy quantitative trait locus (QTL) identified from weedy rice. This research was conducted to identify qSD12 candidate genes, isolate the candidates from weedy rice, and determine the relation of the dormancy gene to ABA. A fine mapping experiment, followed by marker-assisted progeny testing for selected recombinants, narrowed down qSD12 to a genomic region of <75 kb, where there are nine predicted genes including a cluster of six transposon/retrotransposon protein genes and three putative (a PIL5, a hypothetic protein, and a bHLH transcription factor) genes based on the annotated Nipponbare genome sequence. The PIL5 and bHLH genes are more likely to be the QTL candidate genes. A bacterial artificial chromosome (BAC) library equivalent to 8-9 times of the haploid genome size was constructed for the weedy rice. One of the two BAC contigs developed from the library covers the PIL5 to bHLH interval. A pair of lines different only in the QTL-containing region of <200 kb was developed as isogenic lines for the qSD12 dormancy and non-dormancy alleles. The dormant line accumulated much higher ABA in 10-day developing seeds than the non-dormant line. In the QTL-containing region there is no predicted gene that has been assigned to ABA biosynthetic or metabolic pathways. Thus, it is concluded that the qSD12 underlying gene promotes ABA accumulation in early developing seeds to induce primary seed dormancy.
Author(s):
Gu, Xing-You , Liu, Tianlei , Feng, Jiuhuan , Suttle, Jeffrey C. , Gibbons, James
Subject(s):
Oryza sativa , seed development , seed dormancy , abscisic acid , plant hormones , marker-assisted selection , transposons , retrotransposons , helix-loop-helix motifs , quantitative trait loci , chromosome mapping , bacterial artificial chromosomes
Format:
p. 97-104.
Note:
Includes references
Source:
Plant molecular biology 2010 May, v. 73, no. 1-2
Language:
English
Publisher:
Dordrecht : Springer Netherlands
Year:
2010
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
File:
Download [PDF File]
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.