strategies for developing banana planting materials free ... · bbtv pilot project history...
TRANSCRIPT
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Western DR Congo report:
Strategies for Developing
Banana Planting Materials free
from Bunchy Top Virus
infection in Bas-Congo
Patrick MOBAMBO (University of Kinshasa)
and Bioversity representative
with UNIKIN Team
and
Germaine VANGU (INERA-Mvuazi station) with
INERA Team
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INTRODUCTION
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Major Production Constraints
• Diseases: especially BBTD as it causes
100% losses
• Lack of clean planting materials
• Also, civil and military unrest in DRC
(1996-2003) has reinforced this situation
• There are also the following:
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Roads
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Transport
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Lack of organized banana markets
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BBTV occurrence, incidence and
distribution
• BBTD was observed in DRC for the first time at Yangambi in 1958
• Since then there was no real study on BBTV
• In 2006, a diagnostic survey was carried out
by INERA scientists with the CFC/INIBAP
funds in three districts to identify and
determine the impact of the disease in the
province of Bas-Congo
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BBTV PILOT PROJECT
History • TRAVEL REPORT – Congo and Ghana:
9 – 22 June 2007
1. Submitted by: Charles Staver
2. Country visited: Kinshasa/M’vuazi, DR Congo;
Accra, Ghana; Amsterdam, Netherlands
3. Co-travelers: Nicolas Roux
(a) Locations and institutions visited:
Kinshasa – Ministry of Agriculture, SECID office
US AID; M’vuazi – INERA research station,
Masende village with BBTV; Accra – workshop with CRI and
IITA
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• In 2007, one village was visited by
Bioversity scientists who found a very
horrible situation
• BBTV has destroyed completely
plantations and exposed the populations
to poverty and to change their diet
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Actions taken to combat the
disease
• The more significant action was a
Bioversity project called « A BBTD Pilot
Zone Project in Bas-Congo Province »
• Funding from Bioversity through the
‘USAID Bridge Funds’
• Surveys conducted Prof. DEDHA in
Kisangani, Maniema, Equator
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Objectives:
• Farmer awareness raising on BBTD (vector,
pathogen, spread, disease-free planting
material, etc.);
• Farmer acceptance and implementation of good
BBTD cultural practices across the Bas-Congo
province;
• Development of clean seed systems to reduce
the spread and impact of banana bunchy top
virus;
• Multiplication of highly productive clones of
preferred cultivars.
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Activities
1. Training on ELISA Analysis in the laboratory;
2. Identify zones which are still relatively virus
free;
3. Extract suckers from plants without visual
symptoms;
4. Select only suckers negative based on TAS-
ELISA;
5. Multiply suckers through macropropagation
techniques;
6. Plant plantlets in a field where all banana
plants have been destroyed by BBTV
previously.
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N° Cultivars Gpe genomic
Site of
collection Symptoms Results
20
Bitika
mayombe AAA Mvuazi Negative Negative
21 Mposa ABBB Mvuazi Negative Positive
22 Tiba AAA Mvuazi Negative Negative
23 Nsikumuna AAB Mvuazi Negative Negative
24 Bubi géant AAB Mvuazi Positive Positive
25 Kimbuambua AAB Mvuazi Negative Negative
26
Epanza 2
mains AAB Mvuazi Negative Negative
27
km 5
yangambi AAB Mvuazi Negative Negative
28
Epanza 3
mains AAB Mvuazi Negative Negative
29
Bitika
bimenta AAA Mvuazi Negative Negative
30 Muasi zoba AAA Mvuazi Negative Negative
31 CRBP 39 AAB Mvuazi Negative Negative
32 SH 3640 AAAA Mvuazi Negative Negative
33 FHIA 18 AAAB Mvuazi Negative Negative
34 Bitika AAB Mvuazi Negative Positive
35 FHIA 25 AABB Mvuazi Negative Negative
36 Nseluka AAB Mvuazi Negative Negative
37 Dessert roux AAA Mvuazi Negative Positive
Table 1. TAS-ELISA results of collected leaf samples
of mother plants from TUBA (Bas-Fleuve) and Mvuazi
(Cataracts) villages
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• Results show that 8% of suckers
extracted from BBTD asymptomatic
mats were tested as BBTV-positive
using TAS-ELISA
• Only suckers which leaf-samples
showed negative responses were
selected for the macropropagation step
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• The 2nd ELISA test was done on young macropropagated plants
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Number Cultivars Gpe genomic Results
1 Diyimba AAB Negative
2 Nseluka AAB negative
3 Mukama AAB Negative
4 Gros Michel AAA Negative
5 Mfuba Ndong AAB Negative
6 Kinsongo AAB Negative
7 Bubi géant AAB Negative
8 Nsikumuna AAB Negative
9 Epanza 2 mains AAB Negative
10 Epanza 3 mains AAB Negative
11 Muasi zoba AAA Negative
12 SH 3640 AAAA Negative
13 Mafuta AAA Negative
14 Walungu 16 AAB Negative
15 Nsakala Ndomb AAB negative
Table 2. TAS-ELISA results of collected leaf samples of clean macropropagated plants
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• Results show that 100% of plantlets
produced via macropropagation were
tested as BBTV-free using TAS-ELISA
• Macropropagated plants were established
in isolated plots in MASENDE with no
visual symptoms of reinfection two years
after planting
• Suckers from this plot were transplanted in
the village where all bananas were
destroyed by BBTV
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July 2007
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Dec 2010
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Nov 2012
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Evaluation of reinfection rate from
plants in Masende
• Collect leaf samples from suckers in
Masende plot
• Carry out ELISA analysis in INERA Mvuazi
station
• Multiply Suckers extracted which tested
negative
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Table 3. TAS-ELISA results on reinfection rate of
BBTV on collected leaf samples of plantain
suckers in Masende
Number Variety Genomic group Results
1 Diyimba AAB Negative
2 Nseluka AAB negative
3 Mukama AAB Negative
4 Gros Michel AAA Negative
5 Mfuba Ndong AAB Negative
6 Kinsongo AAB Negative
7 Bubi géant AAB Negative
8 Nsikumuna AAB Negative
9 Epanza 2 mains AAB Negative
10 Epanza 3 mains AAB Negative
11 Muasi zoba AAA Negative
12 SH 3640 AAAA Negative
13 Mafuta AAA Negative
14 Walungu 16 AAB Negative
15 Nsakala Ndombe AAB negative
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Therefore, there was no re-infection
rate of BBTV in Masende village after
2.5 years of planting. This can be seen
visually on plantain matts here below.
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Results show that
• The Bas-Fleuve District in Bas-Congo has
been identified as a main source of potentially
BBTV-free Musa planting materials and
should ideally be used in conjunction with a
serological assay such as TAS-ELISA to
insure that suckers collected in the field are
free from BBTV.
• The proposed local seed system model shows
promise for recovery of BBTV-infested zones,
with investment in virus detection and training,
as a key component.
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On-going and future research
efforts (2nd Funding)
• Change cropping systems or introduction new
cultural practices: intercropping and alley
cropping systems;
• Raise awareness campaign among farmers;
• BBTV control passes by production and
distribution of clean planting materials.
• Participative experimentations with farmers
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Agroforestry system with plantain
for improving production without
BBTV in the UNIKIN’s research
station in Kinshasa
• Establish the nursery for tree-seeds is
established
• Transplant tree-seedlings in the field
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Complete macropropagation techniques of plantain suckers
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Effect of Substratum on
Macropropagation
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This work is still on-going
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THANK YOU