Tax amount on Gift to my Mother

Chintan Doshi (5 Points)

15 June 2017  
I have NRI Status. I transfer my salary from abroad to INDIA in my NRE Indian bank account. 

How much MAXIMUM amount, I can transfer to my Mother's bank account as a gift, which (amount) is not taxable? 

Also mentioned section number of Gift tax.

Please give me needful reply.