Loss of abscisic acid biosynthesis (aba2) and insensitivity to ethylene (ein2) compromised the expression of foliar symptoms without curtailing infection.


made vulnerable


caused not to work properly

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So, does it mean that the foliar symptoms were not developed in the host plant?

They didn't develop properly. I don't know whether that neans in the host plant., but I assume so.

I'm an English teacher, not a botanist.