4. Phytoalexin:
It is derived from Greek word phyto meaning plant
and alexin means warding off compound.
Muller and Borger(1958) .
He was initiated hypersensitive response against soft-
fruit pathogen Monilinia fructicola in bean.
Low molecular weight,
Anti-microbial compounds
5. Fabaceae and Solanaceae families.
Fungistatic action rather than fungicidal activity.
It is chemically diverse , but large number of
Phytoalexin products are produced by shikimatic acid
pathway.
6.
7. Salient features:
Phytoalexin are produced when host cell come contact
with parasite.
Broad based anti fungal compounds
Quantity may be influenced by age of host, inoculum
concentration, temperature etc.
Not translocated & rarely persistent.
Non specific in its toxicity
