​The high affinity ammonium uptake system in plant’s roots involves transporters in the AMT/Rh family. Which of the following AMT genes is expressed in cortex and endodermis?​

Correct option is B

Explanation-

The AMT (Ammonium Transporter) gene family in plants facilitates high-affinity ammonium uptake. Among the AMT1 subfamily members, AMT1.2 is specifically expressed in the cortex and endodermis of the root. This localization allows it to function efficiently in ammonium uptake and transport from the soil to the inner tissues of the root, playing a key role in nitrogen assimilation.

Incorrect Option -
Option a - AMT1.1 – Expressed mainly in the epidermis and root hairs.
Option c - AMT1.3 – Typically functions in outer layers but not specifically the cortex and endodermis.
Option d - AMT1.5 – Less well characterized and not primarily linked with cortex/endodermis expression.

Final Answer: Option b – AMT1.2