Figure 4.

Light Regulation of Genome Expression.

(A) Overview of light-regulated genome expression by cluster display. W, continuous W light versus dark; FR, continuous far red light versus dark; R, continuous red light versus dark; B, continuous blue light versus dark. The color scale is shown at the bottom. Positive numbers represent fold of induction, and negative numbers represent fold of repression. All rice seedlings were grown at 28°C for 10 d, while Arabidopsis seedlings were grown at 20°C for 6 d. All of those genes that exhibited a twofold or higher differential expression in at least one time point were included.

(B) to (I) Expression profiles of eight representative genes with reciprocal best-matched genes from rice and Arabidopsis, respectively. Biosynthesis pathways ([B] and [C]), utilization/assimilation/degradation pathways ([D], [E], [H], and [I]), and pathways that generate precursor metabolites and energy ([F] and [G]) were represented. (B) O-acetylserine thiollyase (At3g03630 and OsJRFA065652); (C) chlorophyll synthetase (At3g51820 and OsJRFA068855); (D) glyceraldehyde-3-phosphate dehydrogenase (At1g42970 and OsIFCC017765); (E) galactose (galactoside/glucose catabolism) (At5g51820 and OsJRFA068502); (F) ribose 5-phosphate isomerase (At5g44520 and OsJRFA060861); (G) light-harvesting chlorophyll a/b binding protein (At3g54890 and OsIFCC010436); (H) Phe ammonia-lyase (At3g10340 and OsIFCC040013); (I) CTP oxidase (pyrimidine ribonucleotide metabolism) (At4g20320 and OsJRFA070411). Bars in each graph of (B) to (I) correspond to the log₂-transformed expression ratios of W, FR, R, and B light compared with dark. Arabidopsis data are shown in patterned bars and rice in filled bars.