The reaction of four pepper cultivars (California Wonder, Long Green, Hot
Green and strain-9852-17), and their plant susceptibility to inoculum relation with
either Meloldogyne incognita or Rotylenchulus reniformis was studied under
greenhouse conditions during 2002 and 2003 seasons. Dala showed thaI strain-9852-
17 CV. was rated as highly resistant (HR) to root-knot nematode, M. incognita and
reniform nematode R. renlformis. White, California Wonder and Long Green cultivars
were rated as susceptible (S) for M. incognita and R. reniformis. Whereas, Hot Green
pepper cv. was rated as slightly resistant (SR) to M. incognita and R. reniformis. It was
noticed that phenolic compounds had a high concentratlon in un·infected pepper than
inoculated by either tested nematode. The percent age of phenol reduction was higher
when the pepper infected with M. incognita than R. reniformis. On the other hand, this
eVidence was conformed at the molecular level where there are the same differences
batween the four tested cultivars (California Wonder, Long Green, Hot Green and
slrain-9852-17) by using RAPD analysis. Amplification of genomic DNA from four
pepper cultivars indicated that some bands were common to all cultivars but variations
were also existing. The differences were not only in the major bands but also in some
minor bands. In primer OP-MO showed total of five specifiC bands. One band can be
used as a ma~er on position 950-bp in variety (strain-9852-17) that has highly
resistant to M. incognita and R. reniform/so Also, in primer OP-k11 Showed total of
eight specific bands. Three bands absent can be used as a marker in cullivar (strain-
9852·17) on pOSition 2SO-bp ,3QO.bp and 400-bp that have highly resistant and one
band on poSition 1500-bp in one cultivar (Hot Green) which ranked as slightly
resistant to both nematode specles. Whereas, in primer OP·B5 showed total of five
specifIC bands can be used as a marker in one cultlvar strain-9852-17 in three position
compared with those of susceptible remaining cultivars to M. incognita and R.
reniformis (California Wonder and long Green) which probably have carrying a
resistance gene to nematodes in this position.