Developing new resistant varieties
CJ19 mutagenesis trial

Latest update...

CJ19 has been irradiated and is in the process of stabilisation. Plants will be sent to the Northern Territory later in 2018 for planting at the Coastal Plains Research Farm.

CJ19 irradiated tissue culture.

CJ19 overview

CJ19 is a Cavendish selection originally from Indonesia. It is shorter in stature than Williams and is prone to choking in sub-optimal growing conditions. Varietal screening trials in the Northern Territory have shown that it is resistant to Panama disease tropical race 4 (TR4). Agronomic assessments of the plant crop conducted at South Johnstone showed that it has a slightly slower cycling time of approximately 12 months from planting to harvest, compared to Williams 11.3 months. It also produced a smaller average bunch weight of 15.9 kg compared to Williams 16.5 kg. 

Trial progress

Mutagenesis, which is a breeding technique using gamma irradiation to increase  changes in tissue cultured plants has been applied to cultivar CJ19. The aim is to develop an improved variety which retains its tolerance to the disease and with improved agronomic characteristics. 
The first step in this process was to determine how much gamma irradiation to use on this variety. Too much irradiation can severely damage or kill the plant, and too little may not induce sufficient changes to the plants. 
Experiments, known as dose response trials, have been conducted at the Maroochy Research Station and the sufficient dosage for CJ19 was determined. 
CJ19 have been irradiated and are in the process of stabilisation. Plants will be sent to the Northern Territory later in 2018 for planting at the Coastal Plains Research Farm.

Preparing CJ19 tissue culture following gamma irradiation.
Gammacell chamber used to apply gamma irradiation to banana tissue culture.
CJ19 first ratoon in the variety screening trial in the Northern Territory.

Check back on this page for progress updates on this trial.

This trial is part of the Fusarium Wilt Tropical Race 4 Research Program (BA14014), which has been funded by Hort Innovation, co-investment from the Queensland Department of Agriculture and Fisheries, and contributions from the Australian Government. Hort Innovation is the grower-owned, not-for-profit research and development corporation for Australian horticulture.