The Development of Thematic Core Collections in Cassava Based on Yield, Disease Resistance, and Root Quality Traits.

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ID: 277286
2023
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Abstract
Thematic collections (TCs), which are composed of genotypes with superior agronomic traits and reduced size, offer valuable opportunities for parental selection in plant breeding programs. Three TCs were created to focus on crucial attributes: root yield (CC_Yield), pest and disease resistance (CC_Disease), and root quality traits (CC_Root_quality). The genotypes were ranked using the best linear unbiased predictors (BLUP) method, and a truncated selection was implemented for each collection based on specific traits. The TCs exhibited minimal overlap, with each collection comprising 72 genotypes (CC_Disease), 63 genotypes (CC_Root_quality), and 64 genotypes (CC_Yield), representing 4%, 3.5%, and 3.5% of the total individuals in the entire collection, respectively. The Shannon-Weaver Diversity Index values generally varied but remained below 10% when compared to the entire collection. Most TCs exhibited observed heterozygosity, genetic diversity, and the inbreeding coefficient that closely resembled those of the entire collection, effectively retaining 90.76%, 88.10%, and 88.99% of the alleles present in the entire collection (CC_Disease, CC_Root_quality, and CC_Disease, respectively). A PCA of molecular and agro-morphological data revealed well-distributed and dispersed genotypes, while a discriminant analysis of principal components (DAPC) displayed a high discrimination capacity among the accessions within each collection. The strategies employed in this study hold significant potential for advancing crop improvement efforts.
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dos-santos2023theplants Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Dos Santos, Caroline Cardoso;de Andrade, Luciano Rogerio Braatz;do Carmo, Cátia Dias;de Oliveira, Eder Jorge;
Journal Plants (Basel, Switzerland)
Year 2023
DOI
3474
URL
Keywords
breeding genetic resource germplasm manihot esculenta crantz

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