INSIGHTS INTO TOLERANCE OF SAG12:IPT PLANTS TO FLOODING AND HYPOXIA USING TRANSCRIPTOME ANALYSIS

Authors: Vantoai, Tara; LIU, F - TIGR; KLAPA, M - THE UNIV OF MARYLAND; MOY, L - TIGR; HUYNJ, L - THE OHIO STATE UNIV.; BOCK, G - TIGR; KANANI, H - THE UNIV OF MARYLAND; LINFORD, L - TIGR; BANOWETZ, G - USDA; QUACKENBUSH, J - TIGR

Submitted to: Conference of the International Society for Plant Anaerobiosis
Publication Type: Abstract Only
Publication Acceptance Date: 4/5/2004
Publication Date: 9/20/2004
Citation: Vantoai, T.T., Liu, F., Klapa, M., Moy, L., Huynj, L., Bock, G., Kanani, H., Linford, L., Banowetz, G., Quackenbush, J. 2004. Insights into tolerance of sag12:ipt plants to flooding and hypoxia using transcriptome analysis [abstract]. Conference of the International Society for Plant Anaerobiosis. p. 38.

Interpretive Summary:

Technical Abstract: Transgenic arabidopsis plants (IPT) containing the SAF12:ipt autoregulated cytokinin production capability accumulate more cytokinin and remain greener and produce more biomass and seeds than wild-type (WT) plants under flooding stress. To gain insight into changes in gene expression that contribute to flooding tolerance, whole genome microarray analysis of the 27,000 Arabidopsis genes was conducted at specific times during a 24-hour period of non-flooded control, waterlogging, complete submergence and 3% oxygen stress. Hierarchical clustering using Euclidean distance metric revealed distinct patterns of gene expression in these treatments. Under stresses, genes of photosynthesis and energy utilization pathways expressed 2- to 4-fold more in the tolerant IPT plants than in WT plants suggesting that flooding tolerance mechanisms involve both energy production and utilization. Promoter analysis revealed an over-representation of AtMYB2 transciption factor binding motif and putative cis-elements in the differentially expressed genes.