IITA News

Study identifies new sources of resistance to Black Sigatoka in banana

A study looking for additional sources of resistance to the deadly fungal disease of banana, black Sigatoka, has identified 11 new accessions that are potential sources of resistance to Pseudocercospora fijiensis. These accessions are from a collection of banana germplasm maintained by IITA at Sendusu, Wakiso District in Uganda. They can be used to broaden the current narrow genetic base for ongoing efforts to breed bananas with resistance to the disease.

Black Sigatoka, caused by P. fijiensis, is one of the most devastating banana diseases. In commercial banana-growing systems, black Sigatoka is primarily managed using fungicides. However, this method of controlling the disease is not feasible for resource-limited smallholder farmers. Therefore, developing banana varieties resistant to P. fijiensis remains one of the most effective ways to support smallholder farmers to protect their bananas, income, and food security.

Black Sigatoka is one of the most devastating banana diseases.

Currently, breeding banana resistant to P. fijiensis is dependent on a narrow gene pool of resistance genes, mostly from the wild banana accession, Calcutta 4 and the edible Pisang Lilin banana. P. fijiensis can reproduce sexually in nature; thus, it can evolve, generating variants that can overcome existing sources of resistance. There is a need to diversify the pool of resistance sources to ensure the durability of developed resistant cultivars. Therefore, the identification and introgression of new and effective P. fijiensis resistance genes into banana hybrids and cultivars is necessary.

The team evaluated 95 banana accessions under field conditions in Sendusu to identify additional sources of resistance. Eleven of these accessions responded to P. fijiensis infection in a similar manner to Calcutta 4, a cultivar widely used as a source of P. fijiensis resistance genes. Therefore, these 11 accessions could be used as parents in IITA and NARO’s banana program in East Africa.

“Some of the accessions identified to be resistant to black Sigatoka like Tani, Truncata, Balbisiana, Long Tavoy, Pahang, Pisang KRA, and Malaccensis 0074, are diploids and can be useful for breeding programs,’’ Janet Kimunye, IITA PhD student and the lead author, explained.

Study identifies new sources of resistance to Black Sigatoka in banana

Banana inflorescence and fruits infected with black sigatoka disease.

Other accessions that grouped with Calcutta 4, like Pisang Lilin, Monyet, and Cacambou, allowed the pathogen to sporulate. Thus, their reaction is more appropriately described as intermediate or partial resistance characterized by typical but slow symptom progression up to necrosis. “The resistance provided by these accessions needs to be stacked to develop cultivars with durable black Sigatoka resistance,’’ recommended George Mahuku, Senior Pathologist at IITA.

The study was drawn from IITA Uganda and Tanzania in collaboration with researchers from the Department of Plant Pathology, Stellenbosch University, University of Hohenheim, and the Laboratory of Tropical Crop Improvement, KU Leuven, Belgium.

This study was part of the project ‘Improvement of banana for smallholder farmers in the Great Lakes Region of Africa’, under the CGIAR Research Program for Roots, Tubers and Bananas (CRP-RTB) framework. The findings can be found in a paper ‘Sources of resistance to Pseudocercospora fijiensis, the cause of black Sigatoka in banana’ published in Plant Pathology on 24 May.

bananaBlack SigatokaIITA News no 2597

Evans Samuel • 16th July 2021


Previous Post

Next Post

Leave a Reply

Your email address will not be published / Required fields are marked *

restbet restbet tv restbet giriş restbet restbet güncel restbet giriş restbet restbet giriş restizle betpas betpas giriş pasizle betpas betpas giriş pasizle iskambil oyunları rulet nasıl oynanır blackjack nasıl oynanır uluslararası nakliyat istanbul eşya depolama tuzla eşya depolama evden eve nakliyat eşya depolama evden eve nakliyat malatya rent a car bostancı evden eve nakliyat üsküdar evden eve nakliyat sex shop beşiktaş sex shop maltepe sex shop nakliyat istanbul şehirler arası nakliyat

diyarbakir escort trabzon escort urfa escort van escort aksaray escort batman escort karabuk escort duzce escort yalova escort sivas escort
porno izle
Buca eskort
cialis satış cialis fiyat cialis 20 mg cialis 100 mg cialis 5 mg fiyat

viagra fiyatı

viagra 100 mg fiyat

viagra sipariş

orjinal viagra

viagra satın al

sohbet okey oyna
ankara escort marmaris escort bursa escort mersin escort antalya escort izmir escort samsun escort bodrum escort çeşme escort kuşadası escort adana escort eskişehir escort gaziantep escort esenyurt escort pendik escort tuzla escort fatih escort ümraniye escort mecidiyeköy escort kartal escort bahçelievler escort bahçeşehir escort ataşehir escort bakırköy escort nişantaşı escort avcılar escort büyükçekmece escort kurtkoy escort konya escort beşiktaş escort taksim escort beylikdüzü escort malatya escort sakarya escort şişli escort maltepe escort kadıköy escort ataköy escort bostancı escort şirinevler escort bağcılar escort üsküdar escort etiler escort başaksehir escort ortaköy escort kağıthane escort sultangazi escort halkalı escort çekmeköy escort şaşkınbakkal escort mamak escort sincan escort keçiören escort çankaya escort beypazarı escort akyurt escort pursaklar escort kahramankazan escort göztepe escort alsancak escort bornova escort buca escort karabaglar escort karşıyaka escort konak escort narlıdere escort izmit escort başiskele escort kandira escort körfez escort karamürsel escort dilovası escort gölcük escort gebze escort kocaeli escort kayseri escort elazığ escort denizli escort diyarbakir escort adana escort ankara escort izmir escort antalya escort gaziantep escort kayseri escort konya escort mersin escort denizli escort kocaeli escort diyarbakır escort