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Abstract Detail



Genetics Section

Samakoush, Fatemeh Abedi [1], Mattsson, Jim [2].

Mutants in the rice Auxin Response Factor 11 gene have reduced growth, fecundity and leaf vein density.

There is considerable interest in understanding the genetic basis of vein formation in rice in conjunction with research towards new varieties with C4 photosynthesis traits, including higher vein density. Based on sequence similarity and phylogenetic analysis, OsARF11 is a potential ortholog of the Arabidopsis transcription factor MONOPTEROS/AUXIN RESPONSE FACTOR 5, which plays a key role in vein formation of Arabidopsis leaves among other functions. Here we describe characterization of a mutant with an insertion in the OsARF11 gene. Homozygous mutant plants have reduced shoot and root growth and a remarkable 40% reduction in seed production compared to wild type plants grown under the same conditions. Leaves of both seedlings and fully mature plants show reduced number of veins and lower vein density as a function of leaf width. The midvein of mutant tiller leaves is also reduced both in diameter and complexity.. Taken together, the results demonstrate that OsARF11 contributes to plant growth, fecundity, and the regulation of leaf vein density in rice. The results also suggest that the OsARF11 is a suitable candidate gene for manipulation of vein density in this economically important species.


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1 - Simon Fraser University, Cell and Molecular Biology
2 - Simon Fraser University, Biological Sciences, 8888 University Drive, Burnaby, N/A, V5A 1S6, Canada

Keywords:
Vein density
Auxin response factor
Auxin signaling
Monopteros.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Hall D/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 5:30 PM
Number: PGN002
Abstract ID:863
Candidate for Awards:Genetics Section Poster Award


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