Dear Kriti,

If you doing research for you Ph.D, in my opinion it is better to publish papers jointly with you guide. After the award of Ph.D you can share your papers with any renowned professional who has the capability of considerably improving your MS. If you have a good relation with your guide you should  keep his/her name too. 

I have taken help of many world renowned plant nomenclature specialists from all over the world. They helped me immensely but NEVER asked for authorship! However, I have never failed to acknowledge them properly.

With best wishes,

Subir.