Abstract
3 Abstract: Genetic enhancement of cassava aimed at increasing production and productivity through the provision of broad-based improved germplasm is a major goal for Cassava breeders. At IITA, Nigeria, eighteen varieties comprising twelve landraces and six broad-based and improved varieties were evaluated at four locations in 3 years in a randomized complete block design in four replicates to determine variability among cultivars for yield components and adaptation to different environments. Results showed fresh root yield was significantly correlated (P<0.001) with number of roots, harvest index, shoot weight and number of stands harvested. AMMI analysis partitioned main effects into genotypes, environments and G×E with all the components showing highly significant effects (P<0.001). Environment had the greatest effect (70.3%), G×E interaction (19.0%) and genotype(10.7%). AMMI1 and unadjusted means selected the same winner in nine out of twelve environments (75%), but differently in three environments. The GGE biplot (E and G×E interaction) delineated environments into three mega-environments. Cultivar 4(2)1425 (moderately yielding) was the most stable and specifically adapted to Zaria. ABBEY-IFE, ATU-IWO and 2ND-AGRIC though moderately yielding were highly tolerant to CMD, suggesting a rich resource within the germplasm that could be enhanced for further genetic improvement of the crop.
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Claims 6
Claim · model-written summary
Cassava fresh root yield correlated significantly with roots, harvest index, shoot weight, and stands harvested.
- Taxon
- Cassava
Manihot esculentat0 - Organ / stage
- rootse0
- Outcome
- fresh root yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava”
e0“fresh root yield was significantly correlated (P<0.001) with number of roots, harvest index, shoot weight and number of stands harvested”
Claim · model-written summary
Genotype, environment, and genotype-by-environment terms had highly significant effects, with environment accounting for the largest share.
- Taxon
- CassavaManihot esculentat0
- Outcome
- main effectse0
- Direction
- greateste0
- Value
- 70.3%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava”
e0“AMMI analysis partitioned main effects into genotypes, environments and G×E with all the components showing highly significant effects (P<0.001). Environment had the greatest effect (70.3%), G×E interaction (19.0%) and genotype(10.7%).”
Claim · model-written summary
AMMI1 and unadjusted means chose the same winner in nine of twelve environments.
- Taxon
- CassavaManihot esculentat0
- Outcome
- selected the same winnere0
- Value
- 75%e0
- Comparator
- unadjusted meanse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava”
e0“AMMI1 and unadjusted means selected the same winner in nine out of twelve environments (75%), but differently in three environments.”
Claim · model-written summary
GGE biplot divided the tested environments into three mega-environments.
- Taxon
- CassavaManihot esculentat0
- Outcome
- three mega-environmentse0
- Value
- three mega-environmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava”
e0“The GGE biplot (E and G×E interaction) delineated environments into three mega-environments.”
Claim · model-written summary
Cultivar 4(2)1425 was most stable and specifically adapted to Zaria.
- Taxon
- CassavaManihot esculentat0
- Material
- Cultivar 4(2)1425e0
- Outcome
- most stable and specifically adaptede0
- Setting
- Zariae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava”
e0“Cultivar 4(2)1425 (moderately yielding) was the most stable and specifically adapted to Zaria.”
Claim · model-written summary
ABBEY-IFE, ATU-IWO, and 2ND-AGRIC were highly tolerant to CMD.
- Taxon
- CassavaManihot esculentat0
- Material
- ABBEY-IFE, ATU-IWO and 2ND-AGRICe0
- Outcome
- highly tolerant to CMDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava”
e0“ABBEY-IFE, ATU-IWO and 2ND-AGRIC though moderately yielding were highly tolerant to CMD”