The breakdown of vertical resistance due to the development of a new physiological race is
A. Vertifolia effect
B. Horizontal spread
C. Pseudoresistance
D. None of the above
Answer: Option A
Solution (By Examveda Team)
The breakdown of vertical resistance due to the development of a new physiological race is the Vertifolia effect.The Vertifolia effect is a well-documented phenomenon in the fields of plant breeding and plant pathology. It is characterized by the erosion of a crop's horizontal resistance to disease during a breeding cycle due to the presence of strong vertical resistance, characterized by the presence of R genes.
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