Inoculation with non-host P. nicotianae or treatment with BABA elicits
localized autofluorescent compounds and reduces photosynthetic rate
in C. annuum
Capsicum annuum leaves were sprayed with a suspension of 2,000 P. nicotianae zoospores, 2.5
mM BABA, or water (control) and incubated in a humidity chamber. After 48 h inoculated leaf
tissue was excised and imaged using a stereo fluorescent microscope. Auto-fluorescent spots,
less than 1 mM in diameter, were present on leaves inoculated with P. nicotianae or treated
with BABA at the site of inoculation or treatment (Fig 2). No auto-fluorescence was visible outside
of the inoculated or treatment area. Occasionally, small necrotic spots (< 1mm in diameter)
developed at the site of inoculation with P. nicotianae or treatment with BABA (data not