Figure 8. Effects of Viagra and ODQ on pollen germination and tube growth in the presence of exogenous NOS inhibitor L-NNA, NO scavenger cPTIO or NO donor DEA NONOate under cold acclimation.

Pollen germination and tube length were determined after 2 h incubation. The concentrations of reagents were as follows, 80 μM Viagra, 200 μM cPTIO, 300 μM L-NNA, 50 μM ODQ and 25 μM DEA NONOate. Data are the means of three replicates ± SD. Means with different letters are significantly different at P<0.05.