GCTCV-105 is a Giant Cavendish tissue-culture variant selected by TBRI for its resistance to tropical race 4, which causes disease in Cavendish cultivars. It was obtained by testing in infested fields tissue-culture plantlets produced from rhizomes of Pei Chiao obtained from different locations in Taiwan.
Morphological and agronomic characteristics
GCTCV-105 is about 2.6 m tall and has a pseudostem girth of about 70 cm , making it slightly shorter and more slender than Pei Chiao, the Giant Cavendish clone from which it is derived. Its growth cycle is around 11.5-12.5 months. It produces a uniform, compact bunch of about 24 kg, with a larger number of slightly shorter and less curved fingers than Pei Chiao.
The starchy fruits have excellent flavour, a sugar content of 20-24°Brix and a shelf life of 3-4 days.
Host reaction to pests and diseases
GCTCV-105 is less susceptible to F. oxysporum f. sp. cubense race 4 than the local Giant Cavendish clone Pei Chiao. Disease incidence of 1.6% and 1.9% was recorded for GCTCV-105 in two field trials, compared to 69% and 42.6% for Pei Chiao. Like all Cavendish bananas, GCTCV-105 is resistant to F. oxysporum f. sp. cubense race 1 and susceptible to Mycosphaerella fijiensis and BBTV. It is tolerant to banana flower thrips.