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Abstract Detail


Water Relations

Oh, Se-Jun [1], Kwon, Chang-Woo [1], Kim, Youn Shic [1], Kim, Ju-Kon [1].

Rice APETALA2 in Stress- and Yield-related Traits.

APETALA2 (AP2) is a family of transcription factors that are involved in flower development, plant growth and stress tolerance. As a step towards understanding mechanisms underlying stress response of rice, expressing profiling was conducted with RNAs from rice grown in the time course of stress treatments using the 60K rice whole genome microarray. A group of AP2 genes are up-regulated by the stress treatments. Transgenic overexpression of the genes under the control of either a constitutive or a root-specific promoter resulted in enhanced tolerance to abiotic stresses. Surprisingly, in some AP2 factors, significant increase in yield-parameters was observed as well. These parameters include total seed weight, total number of seeds, number of filled seeds, filling rate and harvest index. By combining results from the expression profiling between transgenic plants and nontransgenic control plants and those from chromatin immunoprecipitation followed by promoter microarray, we identified target genes that were activated by the AP2 factors in the transgenic rice. We conclude that AP2 factors activated the target genes, which not only make the transgenic plants tolerant to abiotic stresses but also increase their yield.


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1 - Myongji University, School of Biotechnology and Environmental Engineering, 38-2, Namdong, Yongin, Kyonggi, 449, Korea

Keywords:
APETALA2
abiotic stress
yield
Transgenic rice
microarray
ChIP-on-chip.

Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P09023
Abstract ID:2027


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