Abstract: The instant invention is directed to a constitutive promoter for use in plants. The plant genus from which the promoter is derived is Arabidopsis. The invention encompasses the isolated promoter, expression cassettes comprising said promoter and a heterologous nucleic acid segment, and monocot and dicot plants and plant cells transformed with said expression cassettes.

Abstract: Individual probes on micro-arrays are re-scaled and corrected with a set of probe dependent coefficients derived from genomic-DNA hybridization signals. A dynamic range for gDNA binding is determined by measuring a concentration signal curve. Signals for each probe are measured during multiple hybridizations within a linear range. Concentration insensitive probes are then found for two sets of experiments. Probes are discarded based on a threshold compared to their standard deviation divided by their average in each set. The correction coefficients are used to calculate a corrected intensity for each probe. Probes having high uncertainty (0.5 in one embodiment) are discarded. A weighting factor for each probe is determined along with an uncertainty factor. Finally, a call for each gene is made, such as absent, marginal or present.

Abstract: The invention provides a method to identify a plurality of plant promoters having specified characteristics and promoters identified by the method. Also provided are transgenic plants comprising the genes identified by the methods of the invention.

Abstract: The invention provides a method to identify a plurality of plant promoters having specified characteristics and promoters identified by the method. The plant genus from which at least some of the promoters are derived is Arabidopsis. Also provided are transgenic plants comprising the genes identified by the methods of the invention.

Abstract: Isolated plant polynucleotides encoding genes the expression of which confer resistance or tolerance to biotic or abiotic stress are disclosed. Particular genes conferring tolerance to abiotic stresses such as drought are presented.

Abstract: The invention provides a method to identify a plurality of plant promoters having specified characteristics and promoters identified by the method. Also provided are transgenic plants comprising the genes identified by the methods of the invention.

Abstract: Methods to identify genes, the expression of which are altered in response to pathogen infection, are provided, as well as the genes identified thereby and their corresponding promoters.

Abstract: The invention provides a method to identify genes that are modulated by posttranscriptional gene silencing as well as regulatory elements and methods to modulate gene expression by posttranscriptional gene silencing.