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Enter keyword(s) and/or category/ies. Selecting categories for a query makes a search more specific. For example, you can retrieve sentences that contain the word HSN and a
Oryza sativa
gene name by typing the keyword 'SPW1' and choosing the category 'gene (Oryza sativa)'. A category hit occurs when a particular word or phrase in the sentence is defined as a member of a particular category. Categories will be concatenated by a Boolean 'and' operation to other categories and keyword(s) if present. To search for terms in categories, click on the Categories/Ontology link above.
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Score:
5.00
Title:
Over-expression of miR172 causes loss of spikelet determinacy and floral organ abnormalities in rice ( Oryza sativa ) .
Author:
Zhu QH Upadhyaya NM Gubler F Helliwell CA
Journal:
BMC Plant Biol
Citation:
V : 9 P : 149
Year:
2009
Type:
In-Process
Literature:
oryza
Field:
abstract
Doc ID:
pub20017947
Accession (PMID):
20017947
Abstract:
BACKGROUND : Regulation of gene expression by microRNAs ( miRNAs ) plays a crucial role in many developmental and physiological processes in plants . miRNAs act to repress expression of their target genes via mRNA cleavage or translational repression . Dozens of miRNA families have been identified in rice , 21 of which are conserved between rice and Arabidopsis . miR172 is a conserved miRNA family which has been shown to regulate expression of APETALA2 ( AP2 ) -like transcription factors in Arabidopsis and maize . The rice genome encodes five AP2-like genes predicted to be targets of miR172 . To determine whether these rice AP2-like genes are regulated by miR172 and investigate the function of the target genes , we studied the effect of over-expressing two members of the miR172 family on rice plant development . RESULTS : Analysis of miR172 expression showed that it is most highly expressed in late vegetative stages and developing panicles . Analyses of expression of three miR172 targets showed that SUPERNUMERARY BRACT ( SNB ) and Os03g60430 have high expression in developing panicles . Expression of miR172 was not inversely correlated with expression of its targets although miR172-mediated cleavage of SNB was detected by 5 rapid amplification of cDNA ends ( RACE ) . Over-expression of
miR172b
in rice delayed the transition from spikelet meristem to floral meristem , and resulted in floral and seed developmental defects , including changes to the number and identity of floral organs , lower fertility and reduced seed weight . Plants over-expressing
miR172b
not only phenocopied the T-DNA insertion mutant of SNB but showed additional defects in floret development not seen in the snb mutant . However SNB expression was not reduced in the
miR172b
over-expression plants . CONCLUSIONS : The phenotypes resulting from over-expression of
miR172b
suggests it represses SNB and at least one of the other miR172 targets , most likely Os03g60430 , indicating roles for other AP2-like genes in rice floret development . miR172 and the AP2-like genes had overlapping expression patterns in rice and their expression did not show an obvious negative correlation . There was not a uniform decrease in the expression of the AP2-like miR172 target mRNAs in the
miR172b
over-expression plants . These observations are consistent with miR172 functioning via translational repression or with expression of the AP2-like genes being regulated by a negative feedback loop .
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