Abstract
Cassava is an important root crop in sub-Saharan Africa, largely cultivated for its starchy edible roots. Biofortified cassava varieties with enhanced provitamin A carotenoid content (PVAC) developed through conventional breeding provide a solution for vitamin A deficiency among vulnerable communities. The aim of this study was to use diallel analysis of six provitamin A cassava genotypes to determine the combining ability, genetic components, heritability, and heterosis of the most important yield characteristics and total carotenoids. Genetic variability for measured characteristics were evident. Fresh root yield was mainly determined by non-additive genetic effects, while dry matter content and total carotenoids were determined by additive effects. Total carotenoids were negatively correlated with fresh root yield, indicating that selection for higher provitamin A content could reduce yield. Mid and higher parent heterosis was seen in some of the crosses for fresh root yield, dry matter content, and total carotenoids. Narrow sense heritability was moderate for fresh root yield and dry matter content, and was high for total carotenoids. This study indicated that yield and dry matter content can be improved in provitamin A cassava but that increased provitamin A content may carry a yield penalty.
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Claims 8
Claim · model-written summary
Genetic variability for the measured characteristics was evident in provitamin A cassava.
- Taxon
- Cassava
Manihot esculentae0 - Outcome
- Genetic variability for measured characteristicse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava is an important root crop in sub-Saharan Africa”
e1“Genetic variability for measured characteristics were evident”
Claim · model-written summary
Fresh root yield in provitamin A cassava was mainly determined by non-additive genetic effects.
- Taxon
- CassavaManihot esculentae0
- Outcome
- Fresh root yielde1
- Qualifier
- mainly determined by non-additive genetic effectse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava is an important root crop in sub-Saharan Africa”
e1“Fresh root yield was mainly determined by non-additive genetic effects, while dry matter content and total carotenoids were determined by additive effects”
Claim · model-written summary
Dry matter content and total carotenoids were determined by additive genetic effects.
- Taxon
- CassavaManihot esculentae0
- Outcome
- dry matter content and total carotenoidse1
- Qualifier
- determined by additive effectse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava is an important root crop in sub-Saharan Africa”
e1“Fresh root yield was mainly determined by non-additive genetic effects, while dry matter content and total carotenoids were determined by additive effects”
Claim · model-written summary
Total carotenoids were negatively correlated with fresh root yield.
- Taxon
- CassavaManihot esculentae0
- Compound
- Total carotenoidse1
- Outcome
- fresh root yielde1
- Direction
- negatively correlatede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava is an important root crop in sub-Saharan Africa”
e1“Total carotenoids were negatively correlated with fresh root yield”
Claim · model-written summary
Mid and higher parent heterosis was seen in some crosses for fresh root yield, dry matter content and total carotenoids.
- Taxon
- CassavaManihot esculentae0
- Outcome
- Mid and higher parent heterosise1
- Qualifier
- in some of the crossese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava is an important root crop in sub-Saharan Africa”
e1“Mid and higher parent heterosis was seen in some of the crosses for fresh root yield, dry matter content, and total carotenoids”
Claim · model-written summary
Narrow sense heritability was moderate for fresh root yield and dry matter content.
- Taxon
- CassavaManihot esculentae0
- Outcome
- Narrow sense heritabilitye1
- Qualifier
- moderate for fresh root yield and dry matter contente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava is an important root crop in sub-Saharan Africa”
e1“Narrow sense heritability was moderate for fresh root yield and dry matter content, and was high for total carotenoids”
Claim · model-written summary
Narrow sense heritability was high for total carotenoids.
- Taxon
- CassavaManihot esculentae0
- Outcome
- Narrow sense heritabilitye1
- Qualifier
- high for total carotenoidse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava is an important root crop in sub-Saharan Africa”
e1“Narrow sense heritability was moderate for fresh root yield and dry matter content, and was high for total carotenoids”
Claim · model-written summary
Yield and dry matter content can be improved in provitamin A cassava.
- Taxon
- CassavaManihot esculentae0
- Outcome
- yield and dry matter content can be improvede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava is an important root crop in sub-Saharan Africa”
e1“This study indicated that yield and dry matter content can be improved in provitamin A cassava”