What is sunup?

Some articles on sunup:

Papaya Ringspot Virus - Control - Transgenics
... which is a cross between the yellow fleshed Kapoho and the red-fleshed SunUp ... on 76% of Hawaiian papaya acreage, while SunUp is hardly grown commercially ... SunUp is thought to be more resistant to exotic strains of PRSV, while Rainbow has shown susceptibility to such exotic strains of the virus ...