G1/S Transition and the Rb-E2F Pathway 73
Wang Y, Magnard JL, McCormick S, Yang M (2004b) Progression through meiosis I and
meiosis II inArabidopsisanthers is regulated by an A-type cyclin predominately ex-
pressed in prophase I. Plant Physiol 136:4127–135
Wildwater M, Campilho A, Perez-Perez JM, Heidstra R, Blilou I, Korthout H, Chatterjee J,
Mariconti L, Gruissem W, Scheres B (2005) The RETINOBLASTOMA-RELATED gene
regulates stem cell maintenance inArabidopsisroots. Cell 123:1337–1349
Williams L, Grafi G (2000) The retinoblastoma protein – a bridge to heterochromatin.
Trends Plant Sci 5:239–240
Williams L, Zhao J, Morozova N, Li Y, Avivi Y, Grafi G (2003) Chromatin reorganization
accompanying cellular dedifferentiation is associated with modifications of histone
H3, redistribution of HP1, and activation of E2F-target genes. Dev Dyn 228:113–120
Wyrzykowska J, Pien S, Shen W-H, Fleming AJ (2002) Manipulation of leaf shape by
modulation of cell division. Development 129:957–964
Xia R, Wang J, Liu C, Wang Y, Wang Y, Zhai J, Liu J, Hong X, Cao X, Zhu JK, Gong Z (2006)
ROR1/RPA2A, a putative replication protein A2, functions in epigenetic gene silencing
and in regulation of meristem development inArabidopsis. Plant Cell 18:85–103
Yu Y, Dong A, Shen W-H (2004) Molecular characterization of the tobacco SET domain
protein NtSET1 unravels its role in histone methylation, chromatin binding, and seg-
regation. Plant J 40:699–711
Yu Y, Steinmetz A, Meyer D, Brown S, Shen W-H (2003) The tobacco A-type cyclin,
Nicta;CYCA3;2, at the nexus of cell division and differentiation. Plant Cell 15:2763–
2777
Zhao Z, Shen W-H (2004) Plants contain a high number of proteins showing sequence
similarity to the animal SUV39H family of histone methyltransferases. Ann NY Acad
Sci 1030:661–669