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
Planting material selection by farmersWorst: Uprooting from an old field
Better: uprooting from a younger field
Best: selection of well formed, healthy suckers
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???
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
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
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
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
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
Conclusions:
What is potential for additional increase??
Selection of superior or elite mother plants appears promising to increase yields with same current inputs
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)????
Muchas gracias!!!
Dominican Republic – first harvest finalized
Women plantain cooperative - NicaraguaFarmer collaborators - Ghana
Superior plants - Nicaragua