Abstract
Genotype-environment interaction (GEI) presents challenges when aiming to select optimal cassava genotypes, often due to biased genetic estimates. Various strategies have been proposed to address the need for simultaneous improvements in multiple traits, while accounting for performance and yield stability. Among these methods are mean performance and stability (MPS) and the multi-trait mean performance and stability index (MTMPS), both utilizing linear mixed models. This study’s objective was to assess genetic variation and GEI effects on fresh root yield (FRY), along with three primary and three secondary traits. A comprehensive evaluation of 22 genotypes was conducted using a randomized complete block design with three replicates across 47 distinct environments (year x location) in Brazil. The broad-sense heritability ( H2 ) averaged 0.37 for primary traits and 0.44 for secondary traits, with plot-based heritability ( hmɡ2) consistently exceeding 0.90 for all traits. The high extent of GEI variance ( σɡxe2 ) demonstrates the GEI effect on the expression of these traits. The dominant analytic factor (FA3 ) accounted for over 85% of the total variance, and the communality (ɧ) surpassed 87% for all traits. These values collectively suggest a substantial capacity for genetic variance explanation. In Cluster 1, composed of remarkably productive and stable genotypes for primary traits, genotypes BRS Novo Horizonte and BR11-34-69 emerged as prime candidates for FRY enhancement, while BRS Novo Horizonte and BR12-107-002 were indicated for optimizing dry matter content. Moreover, MTMPS, employing a selection intensity of 30%, identified seven genotypes distinguished by heightened stability. This selection encompassed innovative genotypes chosen based on regression variance index ( Sdi2 , R2 , and RMSE) considerations for multiple traits. In essence, incorporating methodologies that account for stability and productive performance can significantly bolster the credibility of recommendations for novel cassava cultivars.
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Claims 11
Claim · model-written summary
Broad-sense heritability averaged 0.37 for primary traits.
- Taxon
- cassava
Manihot esculentat0 - Outcome
- broad-sense heritability ( H2 )e0
- Value
- 0.37e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The broad-sense heritability ( H2 ) averaged 0.37 for primary traits”
t0“cassava genotypes”
Claim · model-written summary
Broad-sense heritability averaged 0.44 for secondary traits.
- Taxon
- cassavaManihot esculentat0
- Outcome
- secondary traitse0
- Value
- 0.44e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“0.44 for secondary traits”
t0“cassava genotypes”
Claim · model-written summary
Plot-based heritability exceeded 0.90 across all traits.
- Taxon
- cassavaManihot esculentat0
- Outcome
- plot-based heritability ( hmɡ2)e0
- Direction
- exceedinge0
- Value
- 0.90e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plot-based heritability ( hmɡ2) consistently exceeding 0.90 for all traits”
t0“cassava genotypes”
Claim · model-written summary
GEI variance was high for the assessed traits.
- Taxon
- cassavaManihot esculentat0
- Outcome
- GEI variance ( σɡxe2 )e0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high extent of GEI variance ( σɡxe2 ) demonstrates the GEI effect on the expression of these traits”
t0“cassava genotypes”
Claim · model-written summary
FA3 accounted for over 85% of total variance.
- Taxon
- cassavaManihot esculentat0
- Outcome
- total variancee0
- Value
- over 85%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The dominant analytic factor (FA3 ) accounted for over 85% of the total variance”
t0“cassava genotypes”
Claim · model-written summary
Communality exceeded 87% for all traits.
- Taxon
- cassavaManihot esculentat0
- Outcome
- communality (ɧ)e0
- Direction
- surpassede0
- Value
- 87%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the communality (ɧ) surpassed 87% for all traits”
t0“cassava genotypes”
Claim · model-written summary
BRS Novo Horizonte was identified as a productive, stable candidate for fresh root yield enhancement.
- Taxon
- cassavaManihot esculentat0
- Material
- BRS Novo Horizontee0
- Outcome
- FRY enhancemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“genotypes BRS Novo Horizonte and BR11-34-69 emerged as prime candidates for FRY enhancement”
t0“cassava genotypes”
Claim · model-written summary
BR11-34-69 was identified as a candidate for fresh root yield enhancement.
- Taxon
- cassavaManihot esculentat0
- Material
- BR11-34-69e0
- Outcome
- FRY enhancemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“genotypes BRS Novo Horizonte and BR11-34-69 emerged as prime candidates for FRY enhancement”
t0“cassava genotypes”
Claim · model-written summary
BRS Novo Horizonte was identified for optimizing dry matter content.
- Taxon
- cassavaManihot esculentat0
- Material
- BRS Novo Horizontee0
- Outcome
- dry matter contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BRS Novo Horizonte and BR12-107-002 were indicated for optimizing dry matter content”
t0“cassava genotypes”
Claim · model-written summary
BR12-107-002 was identified for optimizing dry matter content.
- Taxon
- cassavaManihot esculentat0
- Material
- BR12-107-002e0
- Outcome
- dry matter contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BRS Novo Horizonte and BR12-107-002 were indicated for optimizing dry matter content”
t0“cassava genotypes”
Claim · model-written summary
MTMPS selected seven genotypes with heightened stability at 30% selection intensity.
- Taxon
- cassavaManihot esculentat0
- Outcome
- genotypes distinguished by heightened stabilitye0
- Value
- seven genotypese0
- Qualifier
- selection intensity of 30%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MTMPS, employing a selection intensity of 30%, identified seven genotypes distinguished by heightened stability”
t0“cassava genotypes”