3.6 Fld-regulated genes whose expression was unaffected by
drought
Of the 1675 genes whose expression was modified by Fld presence under
normal growth conditions (Figure 3; Supplementary Table S2), 1336
(~80%) were also affected by water limitation, and
distributed among various clusters described below. The remaining 339
genes responded solely to Fld presence and were grouped in clusters 3
and 4 (Supplementary Figure S6, Supplementary Table S5). Most of these
Fld-responsive genes were induced, constituting cluster 3 with 221
members and conspicuous over-representation of the ubiquitin
(Ub)-proteasome system. Cluster 4 contained 88 genes repressed by the
flavoprotein, with amino acid degradation, metal handling and cytokinin
signal transduction representing enriched functional categories
(Supplementary Figure S6; Supplementary Table S5).