Quantitative trait loci and candidate genes for physico‐chemical traits related to tuber quality in greater yam (Dioscorea alata L.)

BACKGROUND Starch, dry matter content (DMC), proteins, and sugars are among the major influences on yam tuber quality. Genetic improvement programs need simple, rapid, and low‐cost tools to screen large populations. The objectives of this work were, using a quantitative trait loci mapping approach (...

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Bibliographic Details
Published in:	Journal of the science of food and agriculture Vol. 104; no. 8; pp. 4872 - 4879
Main Authors:	Arnau, Gemma, Desfontaines, Lucienne, Ehounou, Adou Emmanuel, Marie‐Magdeleine, Carine, Kouakou, Amani Michel, Leinster, Jocelyne, Nudol, Elie, Maledon, Erick, Chair, Hana
Format:	Journal Article
Language:	English
Published:	Chichester, UK John Wiley & Sons, Ltd 01-06-2024 John Wiley and Sons, Limited Wiley
Subjects:	Agricultural sciences Biodiversity Biomarkers Chemical Physics Chromosome Mapping Dioscorea - chemistry Dioscorea - genetics Dioscorea - metabolism Diploids Dry matter dry matter content Gene mapping Genes Genetic control Genetic improvement Genetics Glycolysis Heritability Life Sciences molecular breeding Phenotype Phenotypic variations Physics Plant Breeding Plant Proteins - genetics Plant Proteins - metabolism Plant Tubers - chemistry Plant Tubers - genetics Plant Tubers - metabolism Plants genetics Populations Populations and Evolution Proteins Quantitative Trait Loci Sciences and technics of agriculture Starch Starch - analysis Starch - genetics Starch - metabolism starch biosynthesis Sucrose Sugar Vegetal Biology starch biosynthesis dry matter content molecular breeding heritability
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Summary:	BACKGROUND Starch, dry matter content (DMC), proteins, and sugars are among the major influences on yam tuber quality. Genetic improvement programs need simple, rapid, and low‐cost tools to screen large populations. The objectives of this work were, using a quantitative trait loci mapping approach (QTL) on two diploid full‐sib segregating populations, (i) to acquire knowledge about the genetic control of these traits; (ii) to identify markers linked to the genomic regions controlling each trait, which are useful for marker‐assisted selection (MAS); (iii) to validate the QTLs on a diversity panel; and (iv) to identify candidate genes from the validated QTLs. RESULTS Heritability for all traits was moderately high to high. Significant correlations were observed between traits. A total of 25 QTLs were identified, including six for DMC, six for sugars, six for proteins, and seven for starch. The phenotypic variance explained by individual QTLs ranged from 14.3% to 28.6%. The majority of QTLs were validated on a diversity panel, showing that they are not specific to the genetic background of the progenitors. The approximate physical location of validated QTLs allowed the identification of candidate genes for all studied traits. Those detected for starch content were mainly enzymes involved in starch and sucrose metabolism, whereas those detected for sugars were mainly involved in respiration and glycolysis. CONCLUSION The validated QTLs will be useful for breeding programs using MAS to improve the quality of yam tubers. The putative genes should be useful in providing a better understanding of the physiological and molecular basis of these important tuber quality traits. © 2023 The Authors. Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0022-5142 1097-0010
DOI:	10.1002/jsfa.12822