Table 1.

A summary of male gametophyte stage-specific transcriptome studies for different plant species

	UNM	BCP	TCP	MPG	PT	GC	SC	VC
A. thaliana	X	X	X	X	X		X
O. sativa	X	X	X	X	X		X	X
N. tabacum	X	X	X1	X	X		XEST
Z. mays				X			XEST
L. longiflorum				X	X	XEST
G. max				X
V. vinifera				X
F. vesca				X
S. lycopersicum				X
P. zeylanica							XEST

Developmental stages: UNM, microspore; BCP, bicellular pollen; TCP, tricellular pollen; MPG, mature pollen; PT, pollen tube; GC, generative cell; SC, sperm cell; VC, vegetative cell. X, signifies at least one microarray or RNA-seq data set. X^EST, EST data is published for N. tabacum (Xin et al. 2011) and Z. mays (Engel et al. 2003) sperm cells and L. longiflorum generative cells (Okada et al. 2006). X¹, generative cell division occurs during pollen tube growth in N. tabacum. See Table S1 and Table S2 for additional references