Evaluation of banana germplasm and genetic analysis of an F1 population for resistance to Fusarium oxysporum f. sp. cubense race 1
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Date
2019
Journal Title
Journal ISSN
Volume Title
Publisher
Euphytica
Abstract
Fusarium wilt of bananas (Musa spp.),
caused by Fusarium oxysporum f. sp. cubense (Foc)
causes up to 100% yield loss in bananas. Foc race 1 in
particular is very devastating to dessert bananas in
Uganda. One of the effective control strategies for the
disease is the development of resistant cultivars
through breeding. The objectives of this study were
to identify suitable banana germplasm for generating a
segregating population for resistance to Foc race 1 and
understand the mode of inheritance of resistance to
Foc race 1. Twenty-two banana accessions sourced
from the National Agricultural Research Organisation
in Uganda were challenged with Foc race 1 in a screen
house experiment. Monyet, resistant to Foc race 1 and
Kokopo, susceptible, were selected and crossed to
generate 142 F1 genotypes. These F1 genotypes were
also challenged with Foc race 1 in a screen house
experiment. Data were collected on rhizome discoloration
index (RDI), leaf symptom index (LSI) and
pseudo-stem splitting (PSS), and analysed for variability.
The banana accessions evaluated showed
varying degrees of resistance to Foc race 1. Segregation
ratios for resistant versus susceptible progenies
fitted 13:3 (v2 = 0.12, P = 0.73) for RDI and 11:5 (v2
= 3.04, P = 0.08) for PSS. Estimated broad sense
heritability was 27.8% for RDI, 13.9% for LSI and
14.7% for PSS. The results suggest that resistance to
Foc race 1 in banana is controlled by at least two
dominant genes with epistatic interaction and that
Description
Keywords
Musa spp., Fusarium wilt, Inheritance, Segregating population, Dominant genes, Foc
Citation
Arinaitwe, I. K., Teo, C. H., Kayat, F., Tumuhimbise, R., Uwimana, B., Kubiriba, J., ... & Othman, R. Y. (2019). Evaluation of banana germplasm and genetic analysis of an F1 population for resistance to Fusarium oxysporum f. sp. cubense race 1. Euphytica, 215(10), 1-11. https://doi.org/10.1007/s10681-019-2493-3(0123456789().,-volV()0123456789().,-volV)