The 1^st cloned plant toxin gene is

A. Hm¹

B. Hm3

C. Tox 3

D. Tox A

Answer: Option A

Solution(By Examveda Team)

The 1^st cloned plant toxin gene is Hm¹.
The HM¹ gene in maize controls both race-specific resistance to the fungus Cochliobolus carbonum race 1 and expression of the NADPH (reduced form of nicotinamide adenine dinucleotide phosphate) dependent HC toxin reductase (HCTR), which inactivates HC toxin, a cyclic tetrapeptide produced by the fungus to permit infection.