About the Cover
The complete sequence of cultivated
rice (Oryza sativa) allows, among
other things, analyses of patterns of
transcriptional activity on a chromosomal
level. Jiao et al. (pages 1641-1657) investigated the transcriptional
activity of rice chromosome 4 using
a tiling path microarray based on
PCR-generated genomic DNA fragments.
The study revealed a correlation
between transcriptional activity
and chromosomal organization based
on cytological and molecular data.
For example, euchromatic regions
enriched for nonredundant gene
models were more transcriptionally
active in the juvenile stage, whereas
heterochromatic regions enriched for
transposon-related gene models
were more active in the adult stage.
The cover shows a collage of karyotyping
of rice pachytene chromosome
4 (blue strand at bottom), the expression
and density of transposonrelated
gene models (top portion),
and the expression and density of
nonredundant gene models (lower
portion) from six representative rice
organ samples. Positions of the centromere
(pink) and the euchromatin/
heterochromatin border (green) in the
karyotyping were highlighted using
fluorescence in situ hybridization.
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Copyright © 2007 by the American Society of Plant Biologists
