Comparative transcriptomics of drought responses in Populus: a meta-analysis of genome-wide expression profiling in mature leaves and root apices across two genotypes

Table 1 Genomic DNA-based selection of probesets

	Exclusive assignation	Number of probesets
Both genotypes	No signal	12,530
	Present only on genomic DNA arrays	9,782
1-Genotype-specific hybridization
Present only on Carpaccio arrays	Present only on genomic DNA arrays	768
	Expressed in root and leaf	154
	Root-preferred expression¹	280	620
	Leaf-preferred expression¹	186
Present only on Soligo arrays	Present only on genomic DNA arrays	518
	Expressed in root and leaf	15
	Root-preferred expression¹	140	346
	Leaf-preferred expression¹	191
2-Probesets matching on both genotype arrays
Both genotypes expression arrays	Expressed in root and leaf	26,834
	Root-preferred expression¹	4,573
	Leaf-preferred expression¹	3,693
Both genotypes genomic DNA arrays	Only on Carpaccio expression arrays		651
	Only on Soligo expression arrays		936
	Sum		61,251

¹Gene expression patterns were assessed without regards to growth conditions, i.e. if transcripts are present in the two replicates of at least one of the 4 conditions dedicated to the organ (root apices or mature leaves) per genotype.

ISSN: 1471-2164