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Positive selection in plantain to increase bunch size - results from trials in Latin America and...
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Transcript of Positive selection in plantain to increase bunch size - results from trials in Latin America and...
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Positive selection in plantain to increase bunch size - results from trials in Latin America and West Africa
C Staver, M. Turmel, BioversityB Dzomeku, CRI Ghana
D Rengifo, IDIAF Dominican RepublicJ Castellon, UNAN Leon Nicaragua
RTB annual meeting 8-12 Dec 2015
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Planting material selection by farmersWorst: Uprooting from an old field
Better: uprooting from a younger field
Best: selection of well formed, healthy suckers
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Question: Can field scale yield potential be increased through the selection of plants with above average finger numberas source of planting material?
Positive selection to increase yield???
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Method – superior, elite and control
Elite: Technician or scientist managed selection in multiple fields with uniform conditions – finger number and plant htMacropropagation with corms from selected plants
Superior: Farmer managed identification of better plants in own fieldsUse of corms for direct planting of test plot
Control: Randomly selected corms either for direct planting or macropropagation
Round one: getting started
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Method – superior, elite and control
Superior: corms (less strict selection)Elite: macropropagation (more strict selection)Control: either corms or macropropagated
Choose bunches with most fingers among 50% of plants reaching harvest first:
Round two: refining selection
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Results: Nicaragua
SiteWithout selection With selection
Fruit number
Bunch weight
Ht of sucker at flowering
Fruit number
Bunch weight
Ht of sucker at flowering
Nicaragua – El PegonFirst cycle dwarf (elite)
46 20.8 1.3 52 23.8 1.4
Nicaragua – Telica first cycle dwarf (superior)
31 37
Nicaragua – TelicaSecond cycle dwarf (superior)
41.2 12.6 44.2 13.9
Nicaragua – Posoltega first cycle dwarf (superior)
32.7 11.2 48.2 16.9
Nicaragua – Rivas first cycle Cemsa ¾ (Superior)
51.4 0.7 54.6 1.3
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Results: Dominican Republic
SiteWithout selection With selection
Fruit number
Bunch weight
Ht of sucker at flowering
Fruit number
Bunch weight
Ht of sucker at flowering
Dominican Republic – Cibao Central macho x hembra (elites)
32 0.75 43 0.9
Dominican Republic – Cibao Central FHIA 21 (elites)
69 0.77 76 0.91
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Results: Ghana
SiteWithout selection With selection
Fruit number
Bunch weight
Ht of sucker at flowering
Fruit number
Bunch weight
Ht of sucker at flowering
Ghana – Fumesua Apantu (false horn) first cycle
28 0.4 45 1.3
Ghana - Fumesua Apantu (false horn) second cycle
30 46
Ghana - Assin Adawomako Apantu (false horn) first cycle
20 0.4 40 0.7
Ghana – Fumesua Apim (French) first cycle
66 1.2 115 1.7
Ghana - Fumesua Apim (French) second cycle
70 1.3 136 2.0
Ghana - Assin Adawomako Apim (French) first cycle
56 0.4 76 0.6
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Conclusions:
What is potential for additional increase??
Selection of superior or elite mother plants appears promising to increase yields with same current inputs
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Follow up steps
How can positive selection become part of improved seed system?- link to tissue culture labs which multiply elite plants- growers with seed system function based on corms- specialized producers of macropropagated plants
Finalize data collection in 2016:- second harvest data from plots- first harvest data from Round 3 plots
With complete data, analyze elite plant selection criteria- plants chosen based on lst cycle, 2nd cycle or both?- plants chosen based on finger number alone or combined with height of following sucker- - how does selection criteria vary based on
marketing units (fingers, bunch, kilograms)????
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Muchas gracias!!!
Dominican Republic – first harvest finalized
Women plantain cooperative - NicaraguaFarmer collaborators - Ghana
Superior plants - Nicaragua