Project Number: 2040-21000-014-07
Start Date: Jan 15, 2013
End Date: Dec 31, 2014
Fruits of the blemish free papaya were obtained from a Trader Joe’s market in California and seeds of the fruit were grown on the Hamakua coast of Hawaii; this line was designated N08-75. Fruit from those plants showed similar characteristics to the commercial variety and indeed were blemish free. The trees were self pollinated and harvested seeds were also grown in the Waiakea region of Hawaii Island that resemble the ‘lava’ type of soil and moisture conditions of Puna, where 90% of Hawaii’s papaya are grown. The resulting fruit of these trees were also free of freckles. To incorporate papaya ringspot virus-resistance to the line, the freckle papaya was crossed with ‘SunUp’, which is a papaya ringspot virus-resistant transgenic cultivar. Recipricol crosses were made using ‘SunUp’ and N08-75 and seeds of the cross were planted out in Waiakea and also in Puna at a commercial papaya farm. Fruit from these trees will become available in January 2013 and will serve as the basis of our marketing trials. In this proposal, the fruits will be harvested starting in 2013 and test marketed for: 1) degree of reduction in blemishes and maintenance of virus resistance, 2) taste quality, 3) brix (sugar) levels, 3) shelf life in local markets in which heat treatment of the papaya is not required, and 5) shelf life in export markets that require heat treatments by vapor heat or irradiation.