Table 1.

Overview of the differences between PEN1 and SYP122

Feature	PEN1 or pen1	SYP122 or syp122-1
Tissue-specific expression	Upregulated in stem	Down-regulated in flower
AFGC array database		Up-regulated by fungal, bacterial, and viral pathogens
Real-time PCR	About fivefold up-regulation by nonhost and host pathogens	31-59-fold up-regulation by nonhost and host pathogens
Primary cell wall FT-IR phenotype	Subtle (1.5% of spectral variance)	Strong (98.2% of spectral variance)
Bgh penetration in mutant	Strong increase (50-70%)	No reproducible increase (10%)
Polarization at Bgh attack site	Strong (6.3-fold higher than at pm)	Slight (2-fold higher than at pm)
Conclusion	Polarized secretion during papilla formation	Suggestive of a general function in secretion, including a role in cell wall deposition