Who has to sign the PAN application i.e. Form 49A/49AA?
​Application in Form 49A/49AA must be signed (left thumb impression in case of persons unable to sing) by :

The applicant; or
Karta in case of HUF; or
Director of a Company; or
Authorised Signaturee in case of Association of Persons, Body of Individuals, Local Authority and Artificial Juridical Person; or
Partner in case of Firm/LLP; or
Trustee; or
Representative Assessee in case of Minor/deceased/idiot/lunatic/mentally retarded.